485BPOS

1933 Act File No.	33-52149
1940 Act File No.	811-7141

Form N-1A

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
	Pre-Effective Amendment No.
	Post-Effective Amendment No.	53
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
	Amendment No.	54

FEDERATED WORLD INVESTMENT SERIES, INC.

(Exact Name of Registrant as Specified in Charter)

Federated Investors Funds

4000 Ericsson Drive

Warrendale, PA 15086-7561

(Address of Principal Executive Offices)

(412) 288-1900

(Registrant’s Telephone Number, including Area Code)

John W. McGonigle, Esquire

Federated Investors Tower

Pittsburgh, Pennsylvania 15222-3779

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):
X	immediately upon filing pursuant to paragraph (b)
	on	pursuant to paragraph (b)
	60 days after filing pursuant to paragraph (a)(1)
	on	pursuant to paragraph (a)(1)
	75 days after filing pursuant to paragraph (a)(2)
	on	pursuant to paragraph (a)(2) of Rule 485
If appropriate, check the following box:
	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, and the Investment Company Act of 1940, the Registrant, FEDERATED WORLD INVESTMENT SERIES, INC., certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Pittsburgh and Commonwealth of Pennsylvania, on the 14^th day of February, 2013.

FEDERATED WORLD INVESTMENT SERIES, INC.

BY:

/s/ Todd P. Zerega

Todd P. Zerega, Assistant Secretary

Pursuant to the requirements of the Securities Act of 1933, this Amendment to its Registration Statement has been signed below by the following person in the capacity and on the date indicated:

NAME	TITLE	DATE
BY: /s/ Todd P. Zerega Todd P. Zerega, Assistant Secretary	Attorney In Fact For the Persons Listed Below	February 14, 2013
John F. Donahue *	Director
J. Christopher Donahue *	President and Director (Principal Executive Officer)
Richard A. Novak*	Treasurer (Principal Financial Officer)
John F. Cunningham*	Director
Maureen Lally-Green*	Director
Peter E. Madden*	Director
Charles F. Mansfield, Jr.*	Director
Thomas O’Neill*	Director
John S. Walsh*	Director
*By Power of Attorney

Federated Emerging Market Debt Fund

Federated International Leaders Fund

Federated International Small-Mid Company Fund

Portfolios of Federated World Investment Series, Inc.

Post-Effective Amendment No. 53

This Post-Effective Amendment is filed for the sole purpose of submitting the XBRL Interactive Data File exhibits for the Risk/Return Summaries of the above-named Funds filed as part of Post-Effective Amendment No. 52 on January 28, 2013. The exhibits filed herewith do not constitute the complete publicly filed disclosure for the Funds, and should be used in conjunction with the complete prospectuses for the Funds.

Exhibit List for Interactive Data File Submissions.

EX-101.INS	INSTANCE
EX-101.SCH	SCHEMA
EX-101.CAL	CALCULATION LINKBASE
EX-101.DEF	DEFINITION LINKBASE
EX-101.LAB	LABEL LINKBASE
EX-101.PRE	PRESENTATION LINKBASE

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED WORLD INVESTMENT SERIES INC
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Federated International Small-Mid Company Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Federated International Small-Mid Company Fund (the "Fund")
Objective [Heading]	rr_ObjectiveHeading	RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund's investment objective is to provide long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	RISK/RETURN SUMMARY: FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 13.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	February 1, 2014
FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	fwisi_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 46% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	46.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that the operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE What are the Fund's Main Investment Strategies?
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund pursues its investment objective by investing at least 80% of its assets in equity securities of foreign small and mid-cap companies. For purposes of this policy, small- and mid-capitalization companies will be defined as any company with a market capitalization, at the time of purchase, within the market capitalization range of stocks included in the Fund's benchmark index, the S&P Developed ex-U.S. Small Cap Growth Index, which was approximately $26 million to $12.3 billion as of November 30, 2012. The Fund's investment adviser's process for selecting investments is bottom-up and growth-oriented. The Fund's investment adviser may invest the Fund's assets in any region of the world. It may invest in companies based in emerging markets, typically in the Far East, Latin America and Eastern Europe, as well as in companies operating in developed countries, such as those of Canada, Japan and Western Europe. The Fund may invest in exchange-traded funds, derivative contracts (such as options, swaps and futures contracts) and hybrid investments (such as notes linked to underlying securities or indices) in order to implement its investment strategy. Because the Fund refers to small- and mid-capitalization investments in its name, the Fund will notify shareholders at least 60 days in advance of any change in its investment policies that would permit the fund to normally invest less than 80% of its assets (which includes any borrowing for investment purposes) in investments in small or mid-companies. For purposes of this limitation, small or mid companies will be defined as companies with market capitalizations similar to companies in the S&P Developed ex-U.S. Small Cap Growth Index. Such definition will be applied at the time of investment and the Fund will not be required to sell a stock because a company has grown outside the market capitalization range of small- or mid-capitalization stocks.
Risk [Heading]	rr_RiskHeading	What are the Main Risks of Investing in the Fund?
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include: Stock Market Risk. The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market. Risk of Foreign Investing. The foreign markets in which the Fund invests may be subject to economic or political conditions which are less favorable than those of the United States and may lack financial reporting standards or regulatory requirements comparable to those applicable to U.S. companies. Risk of Investing in ADRs and Domestically Traded Securities of Foreign Issuers. Because the Fund may invest in American Depositary Receipts and other domestically traded securities of foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case. Small-Cap Company Risk. The Fund may invest in small capitalization (or "small-cap") companies. Small-cap companies may have less liquid stock, a more volatile share price, unproven track records, a limited product or service base, and limited access to capital. The above factors could make small-cap companies more likely to fail than larger companies, and increase the volatility of the Fund's portfolio, performance and Share price. Mid-Cap Company Risk. The Fund may invest in mid-capitalization (or "mid-cap") companies. Mid-cap companies often have narrower markets, limited managerial and financial resources, more volatile performance and greater risk of failure, compared to larger, more established companies. These factors could increase the volatility of the Fund's portfolio, performance and Share price. Currency Risk. Because the exchange rates for currencies fluctuate daily, prices of the foreign securities in which the Fund invests are more volatile than prices of securities traded exclusively in the United States. Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivative contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries. Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies. Risk Related to Investing for Growth. Due to their relatively high valuations, growth stocks are typically more volatile than value stocks. Liquidity Risk. Trading opportunities are more limited for equity securities that are not widely held. This may make it more difficult to sell or buy a security at a favorable price or time. Liquidity risk also refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to. Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets. Exchange-Traded Funds Risk. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded). In addition, ETFs may be subject to the following risks that do not apply to conventional funds: (i) the market price of an ETF's shares may trade above or below their net asset value; (ii) an active trading market for an ETF's shares may not develop or be maintained; or (iii) trading of an ETF's shares may be halted if the listing exchange's officials deem such action appropriate. Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information, such as stock market, interest rate, credit, currency, liquidity and leverage risks. Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy. Leverage Risk. Leverage risk is created when an investment, which includes, for example, an investment in a derivative contract, exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. Investments can have these same results if their returns are based on a multiple of a specified index, security or other benchmark. Technology Risk. Proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance. The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance: Bar Chart and Table Risk/Return Bar Chart
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-341-7400
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	FederatedInvestors.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	Federated International Small-Mid Company Fund - A Class
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower. Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 28.60% (quarter ended June 30, 2009). Its lowest quarterly return was (31.43)% (quarter ended September 30, 2008).
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Return Table
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown for A class.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The IS class commenced operations on March 31, 2008. For the period prior to the commencement of operations for the IS class, the performance information shown is for the Fund's A class. The performance of the A class has not been adjusted to reflect the expenses of the IS class since the IS class has a lower expense ratio than the expense ratio of the A class. The performance of the A class has been adjusted to reflect the absence of sales charges and adjusted to remove any voluntary waiver of the Fund's expenses related to the A class that may have occurred during the period prior to the commencement of operations of the IS class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan. (For the Period Ended December 31, 2012)
Federated International Small-Mid Company Fund | A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	(2.00%)
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.50%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.02%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.20%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.82%
1 Year	rr_ExpenseExampleYear01	744
3 Years	rr_ExpenseExampleYear03	1,149
5 Years	rr_ExpenseExampleYear05	1,578
10 Years	rr_ExpenseExampleYear10	2,769
1 Year	rr_ExpenseExampleNoRedemptionYear01	744
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,149
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,578
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,769
2003	rr_AnnualReturn2003	53.88%
2004	rr_AnnualReturn2004	20.90%
2005	rr_AnnualReturn2005	27.11%
2006	rr_AnnualReturn2006	26.33%
2007	rr_AnnualReturn2007	18.19%
2008	rr_AnnualReturn2008	(52.42%)
2009	rr_AnnualReturn2009	47.07%
2010	rr_AnnualReturn2010	21.44%
2011	rr_AnnualReturn2011	(17.53%)
2012	rr_AnnualReturn2012	22.01%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	28.60%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(31.43%)
1 Year	rr_AverageAnnualReturnYear01	15.31%
5 Years	rr_AverageAnnualReturnYear05	(4.17%)
10 Years	rr_AverageAnnualReturnYear10	11.06%
Federated International Small-Mid Company Fund | B
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	5.50%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	(2.00%)
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.76%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.78%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.16%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	2.62%
1 Year	rr_ExpenseExampleYear01	831
3 Years	rr_ExpenseExampleYear03	1,262
5 Years	rr_ExpenseExampleYear05	1,669
10 Years	rr_ExpenseExampleYear10	2,927
1 Year	rr_ExpenseExampleNoRedemptionYear01	281
3 Years	rr_ExpenseExampleNoRedemptionYear03	862
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,469
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,927
1 Year	rr_AverageAnnualReturnYear01	15.52%
5 Years	rr_AverageAnnualReturnYear05	(4.24%)
10 Years	rr_AverageAnnualReturnYear10	11.00%
Federated International Small-Mid Company Fund | C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	(2.00%)
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.76%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.78%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.16%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	2.62%
1 Year	rr_ExpenseExampleYear01	381
3 Years	rr_ExpenseExampleYear03	862
5 Years	rr_ExpenseExampleYear05	1,469
10 Years	rr_ExpenseExampleYear10	3,109
1 Year	rr_ExpenseExampleNoRedemptionYear01	281
3 Years	rr_ExpenseExampleNoRedemptionYear03	862
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,469
10 Years	rr_ExpenseExampleNoRedemptionYear10	3,109
1 Year	rr_AverageAnnualReturnYear01	20.00%
5 Years	rr_AverageAnnualReturnYear05	(3.85%)
10 Years	rr_AverageAnnualReturnYear10	10.82%
Federated International Small-Mid Company Fund | IS
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	(2.00%)
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.25%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.50%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.02%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.77%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.15%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.62%
1 Year	rr_ExpenseExampleYear01	180
3 Years	rr_ExpenseExampleYear03	557
5 Years	rr_ExpenseExampleYear05	959
10 Years	rr_ExpenseExampleYear10	2,084
1 Year	rr_ExpenseExampleNoRedemptionYear01	180
3 Years	rr_ExpenseExampleNoRedemptionYear03	557
5 Years	rr_ExpenseExampleNoRedemptionYear05	959
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,084
1 Year	rr_AverageAnnualReturnYear01	22.24%
5 Years	rr_AverageAnnualReturnYear05	(2.90%)
10 Years	rr_AverageAnnualReturnYear10	11.79%
Federated International Small-Mid Company Fund | Return After Taxes on Distributions | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.31%
5 Years	rr_AverageAnnualReturnYear05	(4.15%)
10 Years	rr_AverageAnnualReturnYear10	10.88%
Federated International Small-Mid Company Fund | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	9.95%
5 Years	rr_AverageAnnualReturnYear05	(3.45%)
10 Years	rr_AverageAnnualReturnYear10	10.00%
Federated International Small-Mid Company Fund | S&P Developed ex-U.S. Small Cap Growth Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	17.84%	[2]
5 Years	rr_AverageAnnualReturnYear05	(1.39%)	[2]
10 Years	rr_AverageAnnualReturnYear10	11.46%	[2]

[1] The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Tax Reclaim Recovery Expenses) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.80%, 2.60%, 2.60% and 1.60% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[2] The S&P Developed ex-U.S. Small Cap Growth Index was formerly known as S&P/Citigroup EMI Growth World ex-U.S. Index. The S&P Developed ex-U.S. Small Cap Growth Index is a subset of the S&P Developed Broad Market Index. The Small Cap Index covers the lowest 15% of all publicly listed equities in the Broad Market Index within a given country with float-adjusted market values of U.S. $100 million or more and annual dollar value traded of at least U.S. $50 million in all included countries. S&P Developed ex-U.S. Small Cap Growth Index represents approximately 3,552 small-cap companies from the developed nations in North America, Europe, Africa/Middle East and Asia Pacific (excluding the United States) that exhibit strong growth characteristics.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED WORLD INVESTMENT SERIES INC
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Federated Emerging Market Debt Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Federated Emerging Market Debt Fund (the "Fund")
Objective [Heading]	rr_ObjectiveHeading	RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund's investment objective is to seek a high level of current income.
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	The Fund has a secondary objective of capital appreciation.
Expense [Heading]	rr_ExpenseHeading	RISK/RETURN SUMMARY: FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for certain sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in A class of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 15.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	February 1, 2014
FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	fwisi_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 20% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	20.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for certain sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in A class of Federated funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that the operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE What are the Fund's Main Investment Strategies?
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in emerging markets fixed-income investments. The Fund's investments may be denominated in foreign currencies or U.S. dollars, and may be of any duration. The Fund does not limit the amount it may invest in investments rated below investment grade. The Fund may invest in derivative contracts to implement its investment strategies, as more fully described herein. When the Fund's investment adviser ("Adviser") considers the risk/return prospects of emerging markets equity securities to be attractive, the Fund may also opportunistically invest in convertible securities, equity securities or pooled vehicles such as exchange-traded funds (ETFs) or other investment companies in order to gain exposure to a specific region, country, or market sector or for other reasons consistent with its investment strategy. Because the Fund refers to emerging market debt in its name, it will notify shareholders at least 60 days in advance of any change in its investment policies that would enable the Fund to normally invest less than 80% of its assets in emerging market fixed-income investments.
Risk [Heading]	rr_RiskHeading	What are the Main Risks of Investing in the Fund?
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include: Issuer Credit Risk. It is possible that interest or principal on securities will not be paid when due. Such non-payment or default may reduce the value of the Fund's portfolio holdings, its share price and its performance. Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy. Risk Associated with Noninvestment-Grade Securities. The Fund may invest a portion of its assets in securities rated below investment grade that generally are subject to greater interest rate, credit and liquidity risks than investment-grade securities. Risk Related to the Economy. Lower grade bond returns are sensitive to changes in the economy. The value of the Fund's portfolio may decline in tandem with a drop in the overall value of the stock market based on negative developments in the U.S. and global economies. Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies. Liquidity Risk. Trading opportunities are more limited for fixed-income securities that have not received any credit ratings, have received ratings below investment grade or are not widely held. OTC derivative contracts generally carry greater liquidity risk than exchange-traded contracts. This risk may be increased in times of financial stress, if the trading market for OTC derivative contracts becomes restricted. Risk of Foreign Investing. Because the Fund invests in securities issued by foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case. Currency Risk. Exchange rates for currencies fluctuate daily. Accordingly, the Fund may experience increased volatility with respect to the value of its Shares and its returns as a result of its exposure to foreign currencies through direct holding of such currencies or holding of non-U.S. dollar denominated securities. Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivatives contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries. Interest Rate Risk. Prices of fixed-income securities rise and fall in response to interest rate changes for similar securities. Generally, when interest rates rise, prices of fixed-income securities fall. Also, interest rate changes have a greater effect on the price of fixed-income securities with longer durations. Duration measures the price sensitivity of a fixed-income security to changes in interest rates. Risk of Loss after Redemption. The investment companies in which the Fund invests may cause the Fund to experience delays from the time it requests a redemption to the time that such redemption is processed. Credit Enhancement Risk. The securities in which the Fund invests may be subject to credit enhancement. Credit enhancement is designed to help assure timely pay of the security; it does not protect the Fund against losses caused by declines in a security's value due to changes in market conditions. Leverage Risk. Leverage risk is created when an investment exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information (SAI), such as interest rate, credit, currency, liquidity and leverage risks. Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets. Risk of Non-Diversified Fund. The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. In certain situations, being non-diversified may reduce the Fund's credit risk by enabling it to avoid investing in certain countries, regions or sectors that exhibit above average credit risk. Stock Market Risk. The value of equity securities in a Fund's portfolio will fluctuate and, as a result, a Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market. Risk of Exchange-Traded Funds. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up or down, and the Fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down. Technology Risk. Proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance. The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. This increases the Fund's risk by magnifying the impact (positively or negatively) that any one issuer has on the Fund's Share price and performance. The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	Risk of Non-Diversified Fund. The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. In certain situations, being non-diversified may reduce the Fund's credit risk by enabling it to avoid investing in certain countries, regions or sectors that exhibit above average credit risk.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance: Bar Chart and Table Risk/Return Bar Chart and Table
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-341-7400
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	FederatedInvestors.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	Federated Emerging Market Debt Fund - A Class
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower. Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 18.68% (quarter ended June 30, 2009). Its lowest quarterly return was (13.70)% (quarter ended December 31, 2008).
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Return Table
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The stated returns assume the highest historical federalincome and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The Fund's IS class commenced operations on March 30, 2012. For the period prior to commencement of operations of IS class, the performance information shown is for the Fund's A class. The performance of A class has not been adjusted to reflect the expenses of IS class since IS class has a lower expense ratio than the expense ratio of A class. The performance of A class has been adjusted to remove any voluntary waiver of Fund expenses related to A class that may have occurred during the period prior to commencement of operations of IS class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan. (For the Period Ended December 31, 2012)
Federated Emerging Market Debt Fund | A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.56%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.42%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.23%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.19%
1 Year	rr_ExpenseExampleYear01	588
3 Years	rr_ExpenseExampleYear03	879
5 Years	rr_ExpenseExampleYear05	1,191
10 Years	rr_ExpenseExampleYear10	2,075
1 Year	rr_ExpenseExampleNoRedemptionYear01	588
3 Years	rr_ExpenseExampleNoRedemptionYear03	879
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,191
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,075
2003	rr_AnnualReturn2003	30.29%
2004	rr_AnnualReturn2004	10.06%
2005	rr_AnnualReturn2005	10.89%
2006	rr_AnnualReturn2006	13.34%
2007	rr_AnnualReturn2007	4.46%
2008	rr_AnnualReturn2008	(23.05%)
2009	rr_AnnualReturn2009	46.25%
2010	rr_AnnualReturn2010	15.40%
2011	rr_AnnualReturn2011	6.43%
2012	rr_AnnualReturn2012	19.14%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.68%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(13.70%)
1 Year	rr_AverageAnnualReturnYear01	13.77%
5 Years	rr_AverageAnnualReturnYear05	9.24%
10 Years	rr_AverageAnnualReturnYear10	11.74%
Federated Emerging Market Debt Fund | B
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	5.50%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.56%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.17%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.23%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.94%
1 Year	rr_ExpenseExampleYear01	770
3 Years	rr_ExpenseExampleYear03	1,079
5 Years	rr_ExpenseExampleYear05	1,364
10 Years	rr_ExpenseExampleYear10	2,313
1 Year	rr_ExpenseExampleNoRedemptionYear01	220
3 Years	rr_ExpenseExampleNoRedemptionYear03	679
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,164
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,313
1 Year	rr_AverageAnnualReturnYear01	12.69%
5 Years	rr_AverageAnnualReturnYear05	9.13%
10 Years	rr_AverageAnnualReturnYear10	11.57%
Federated Emerging Market Debt Fund | C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.56%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.17%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.23%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.94%
1 Year	rr_ExpenseExampleYear01	320
3 Years	rr_ExpenseExampleYear03	679
5 Years	rr_ExpenseExampleYear05	1,164
10 Years	rr_ExpenseExampleYear10	2,503
1 Year	rr_ExpenseExampleNoRedemptionYear01	220
3 Years	rr_ExpenseExampleNoRedemptionYear03	679
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,164
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,503
1 Year	rr_AverageAnnualReturnYear01	17.23%
5 Years	rr_AverageAnnualReturnYear05	9.41%
10 Years	rr_AverageAnnualReturnYear10	11.39%
Federated Emerging Market Debt Fund | IS
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.31%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.17%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.23%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.94%
1 Year	rr_ExpenseExampleYear01	119
3 Years	rr_ExpenseExampleYear03	372
5 Years	rr_ExpenseExampleYear05	644
10 Years	rr_ExpenseExampleYear10	1,420
1 Year	rr_ExpenseExampleNoRedemptionYear01	119
3 Years	rr_ExpenseExampleNoRedemptionYear03	372
5 Years	rr_ExpenseExampleNoRedemptionYear05	644
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,420
1 Year	rr_AverageAnnualReturnYear01	19.43%
5 Years	rr_AverageAnnualReturnYear05	10.09%
10 Years	rr_AverageAnnualReturnYear10	12.09%
Federated Emerging Market Debt Fund | Return After Taxes on Distributions | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.96%
5 Years	rr_AverageAnnualReturnYear05	6.87%
10 Years	rr_AverageAnnualReturnYear10	8.98%
Federated Emerging Market Debt Fund | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	8.85%
5 Years	rr_AverageAnnualReturnYear05	6.46%
10 Years	rr_AverageAnnualReturnYear10	8.56%
Federated Emerging Market Debt Fund | JPMorgan Emerging Markets Bond Index Global (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	18.54%	[2]
5 Years	rr_AverageAnnualReturnYear05	10.47%	[2]
10 Years	rr_AverageAnnualReturnYear10	11.56%	[2]

[1] Total Annual Fund Operating Expenses have been restated to reflect an anticipated decrease in Other Expenses for the fiscal year ending November 30, 2013, relative to the actual expenses for the fiscal year ended November 30, 2012. The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Dividends and Other Expenses Related to Short Sales) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.18%, 1.93%, 1.93% and 0.93% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[2] The JPMorgan Emerging Markets Bond Index Global is a total return, trade weighted index for U.S. dollar denominated debt instruments issued by emerging market sovereign and quasi-sovereign entities in 33 countries.

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Federated Emerging Market Debt Fund

Federated Emerging Market Debt Fund (the "Fund")

RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE

The Fund's investment objective is to seek a high level of current income.

The Fund has a secondary objective of capital appreciation.

RISK/RETURN SUMMARY: FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for certain sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in A class of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 15.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Federated Emerging Market Debt Fund	A	B	C	IS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	4.50%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	none	5.50%	1.00%	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	none	none	none	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	none	none	none	none
Exchange Fee	none	none	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Federated Emerging Market Debt Fund		A	B	C	IS
Management Fee		0.85%	0.85%	0.85%	0.85%
Distribution (12b-1) Fee		none	0.75%	0.75%	none
Other Expenses		0.56%	0.56%	0.56%	0.31%
Acquired Fund Fees and Expenses		0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses		1.42%	2.17%	2.17%	1.17%
Fee Waivers and/or Expense Reimbursements	[1]	0.23%	0.23%	0.23%	0.23%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements		1.19%	1.94%	1.94%	0.94%

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that the operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:

Expense Example Federated Emerging Market Debt Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	588	879	1,191	2,075
B	770	1,079	1,364	2,313
C	320	679	1,164	2,503
IS	119	372	644	1,420

Expense Example, No Redemption Federated Emerging Market Debt Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	588	879	1,191	2,075
B	220	679	1,164	2,313
C	220	679	1,164	2,503
IS	119	372	644	1,420

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 20% of the average value of its portfolio.

RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE

What are the Fund's Main Investment Strategies?

The Fund invests primarily in emerging markets fixed-income investments. The Fund's investments may be denominated in foreign currencies or U.S. dollars, and may be of any duration. The Fund does not limit the amount it may invest in investments rated below investment grade. The Fund may invest in derivative contracts to implement its investment strategies, as more fully described herein. When the Fund's investment adviser ("Adviser") considers the risk/return prospects of emerging markets equity securities to be attractive, the Fund may also opportunistically invest in convertible securities, equity securities or pooled vehicles such as exchange-traded funds (ETFs) or other investment companies in order to gain exposure to a specific region, country, or market sector or for other reasons consistent with its investment strategy.

Because the Fund refers to emerging market debt in its name, it will notify shareholders at least 60 days in advance of any change in its investment policies that would enable the Fund to normally invest less than 80% of its assets in emerging market fixed-income investments.

What are the Main Risks of Investing in the Fund?

All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include:

• Issuer Credit Risk. It is possible that interest or principal on securities will not be paid when due. Such non-payment or default may reduce the value of the Fund's portfolio holdings, its share price and its performance.

• Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy.

• Risk Associated with Noninvestment-Grade Securities. The Fund may invest a portion of its assets in securities rated below investment grade that generally are subject to greater interest rate, credit and liquidity risks than investment-grade securities.
• Risk Related to the Economy. Lower grade bond returns are sensitive to changes in the economy. The value of the Fund's portfolio may decline in tandem with a drop in the overall value of the stock market based on negative developments in the U.S. and global economies.

• Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies.

• Liquidity Risk. Trading opportunities are more limited for fixed-income securities that have not received any credit ratings, have received ratings below investment grade or are not widely held. OTC derivative contracts generally carry greater liquidity risk than exchange-traded contracts. This risk may be increased in times of financial stress, if the trading market for OTC derivative contracts becomes restricted.

• Risk of Foreign Investing. Because the Fund invests in securities issued by foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case.

• Currency Risk. Exchange rates for currencies fluctuate daily. Accordingly, the Fund may experience increased volatility with respect to the value of its Shares and its returns as a result of its exposure to foreign currencies through direct holding of such currencies or holding of non-U.S. dollar denominated securities.

• Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivatives contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries.

• Interest Rate Risk. Prices of fixed-income securities rise and fall in response to interest rate changes for similar securities. Generally, when interest rates rise, prices of fixed-income securities fall. Also, interest rate changes have a greater effect on the price of fixed-income securities with longer durations. Duration measures the price sensitivity of a fixed-income security to changes in interest rates.

• Risk of Loss after Redemption. The investment companies in which the Fund invests may cause the Fund to experience delays from the time it requests a redemption to the time that such redemption is processed.

• Credit Enhancement Risk. The securities in which the Fund invests may be subject to credit enhancement. Credit enhancement is designed to help assure timely pay of the security; it does not protect the Fund against losses caused by declines in a security's value due to changes in market conditions.

• Leverage Risk. Leverage risk is created when an investment exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain.

• Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information (SAI), such as interest rate, credit, currency, liquidity and leverage risks.

• Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets.

• Risk of Non-Diversified Fund. The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. In certain situations, being non-diversified may reduce the Fund's credit risk by enabling it to avoid investing in certain countries, regions or sectors that exhibit above average credit risk.

• Stock Market Risk. The value of equity securities in a Fund's portfolio will fluctuate and, as a result, a Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market.

• Risk of Exchange-Traded Funds. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up or down, and the Fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down.

• Technology Risk. Proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance.

The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. This increases the Fund's risk by magnifying the impact (positively or negatively) that any one issuer has on the Fund's Share price and performance.

The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Performance: Bar Chart and Table

Risk/Return Bar Chart and Table

The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.

Federated Emerging Market Debt Fund - A Class

The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.

Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 18.68% (quarter ended June 30, 2009). Its lowest quarterly return was (13.70)% (quarter ended December 31, 2008).

Average Annual Total Return Table

The Fund's IS class commenced operations on March 30, 2012. For the period prior to commencement of operations of IS class, the performance information shown is for the Fund's A class. The performance of A class has not been adjusted to reflect the expenses of IS class since IS class has a lower expense ratio than the expense ratio of A class. The performance of A class has been adjusted to remove any voluntary waiver of Fund expenses related to A class that may have occurred during the period prior to commencement of operations of IS class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.

(For the Period Ended December 31, 2012)

Average Annual Total Returns Federated Emerging Market Debt Fund		1 Year	5 Years	10 Years
A		13.77%	9.24%	11.74%
A Return After Taxes on Distributions		11.96%	6.87%	8.98%
A Return After Taxes on Distributions and Sale of Fund Shares		8.85%	6.46%	8.56%
B		12.69%	9.13%	11.57%
C		17.23%	9.41%	11.39%
IS		19.43%	10.09%	12.09%
JPMorgan Emerging Markets Bond Index Global (reflects no deduction for fees, expenses or taxes)	[1]	18.54%	10.47%	11.56%

[1] Total Annual Fund Operating Expenses have been restated to reflect an anticipated decrease in Other Expenses for the fiscal year ending November 30, 2013, relative to the actual expenses for the fiscal year ended November 30, 2012. The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Dividends and Other Expenses Related to Short Sales) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.18%, 1.93%, 1.93% and 0.93% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[1] The JPMorgan Emerging Markets Bond Index Global is a total return, trade weighted index for U.S. dollar denominated debt instruments issued by emerging market sovereign and quasi-sovereign entities in 33 countries.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED WORLD INVESTMENT SERIES INC
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Federated International Leaders Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Federated International Leaders Fund (the "Fund")
Objective [Heading]	rr_ObjectiveHeading	RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund's investment objective is to provide long-term capital growth.
Expense [Heading]	rr_ExpenseHeading	RISK/RETURN SUMMARY: FEES AND EXPENSES
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 13.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	February 1, 2014
FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	fwisi_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 16% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	16.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE What are the Fund's Main Investment Strategies?
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund pursues its investment objective by investing primarily in a portfolio of equity securities issued by foreign companies that the Fund's investment adviser has deemed as undervalued relative to the company; the company's competitive position and/or its growth prospects. The Fund's investment adviser expects that, normally, the Fund's portfolio will be invested primarily in foreign stocks in developed markets. The Fund is permitted, however, to invest in companies from both developed (including the United States) and emerging market countries. The Fund may invest in exchange-traded funds, derivative contracts (such as options, swaps and futures contracts) and hybrid instruments (such as notes linked to underlying securities, indices or commodities) in order to implement its investment strategies. The Fund is intended to integrate the value style of investing across foreign stocks in a broader equity portfolio.
Risk [Heading]	rr_RiskHeading	What are the Main Risks of Investing in the Fund?
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include: Stock Market Risk. The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market. Risk of Foreign Investing. The foreign markets in which the Fund invests may be subject to economic or political conditions which are less favorable than those of the United States and may lack financial reporting standards or regulatory requirements comparable to those applicable to U.S. companies. Risk of Investing in ADRs and Domestically Traded Securities of Foreign Issuers. Because the Fund may invest in American Depositary Receipts and other domestically traded securities of foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case. Currency Risk. Because the exchange rates for currencies fluctuate daily, prices of the foreign securities in which the Fund invests are more volatile than prices of securities traded exclusively in the United States. Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivative contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries. Sector Risk. Because the Fund may allocate relatively more assets to certain industry sectors than others, the Fund's performance may be more susceptible to any developments which affect those sectors emphasized by the Fund. Risk Related to Investing for Value. Due to their relatively low valuations, value stocks are typically less volatile than growth stocks. However, value stocks may lag behind growth stocks in an up market. Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies. Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets. Exchange-Traded Funds Risk. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded). In addition, ETFs may be subject to the following risks that do not apply to conventional funds: (i) the market price of an ETF's shares may trade above or below their net asset value; (ii) an active trading market for an ETF's shares may not develop or be maintained; or (iii) trading of an ETF's shares may be halted if the listing exchange's officials deem such action appropriate. Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information, such as stock market, interest rate, credit, currency, liquidity and leverage risks. Liquidity Risk. Trading opportunities are more limited for equity securities that are not widely held. This may make it more difficult to sell or buy a security at a favorable price or time. Liquidity risk also refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to. Leverage Risk. Leverage risk is created when an investment, which includes, for example, an investment in a derivative contract, exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. Investments can have these same results if their returns are based on a multiple of a specified index, security or other benchmark. Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy. Technology Risk. Proprietary and third-party data systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance. The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance: Bar Chart and Table Risk/Return Bar Chart
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Fund changed its investment strategy on September 4, 2003. Until that time, the Fund invested primarily in securities of companies in the financial services industry. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-341-7400
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	FederatedInvestors.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	Federated International Leaders Fund - A Class
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower. Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 33.12% (quarter ended June 30, 2009). Its lowest quarterly return was (25.69)% (quarter ended September 30, 2011).
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Return Table
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The Fund's IS class commenced operations on June 21, 2010. For the period prior to the commencement of operations of the IS class, the performance information shown is for the A class. The performance of the A class has not been adjusted to reflect the expenses applicable to the IS class since IS class has a lower expense ratio than the expense ratio of A class. The performance of A class has been adjusted to reflect the absence of sales charges and adjusted to remove any voluntary waiver of Fund expenses related to A class that may have occurred during the period prior to commencement of operations of IS class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan. (For the Period Ended December 31, 2012)
Federated International Leaders Fund | A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.05%
Other Expenses	rr_OtherExpensesOverAssets	0.61%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.67%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.17%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.50%
1 Year	rr_ExpenseExampleYear01	710
3 Years	rr_ExpenseExampleYear03	1,048
5 Years	rr_ExpenseExampleYear05	1,407
10 Years	rr_ExpenseExampleYear10	2,418
1 Year	rr_ExpenseExampleNoRedemptionYear01	710
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,048
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,407
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,418
2003	rr_AnnualReturn2003	34.54%
2004	rr_AnnualReturn2004	14.76%
2005	rr_AnnualReturn2005	14.42%
2006	rr_AnnualReturn2006	27.68%
2007	rr_AnnualReturn2007	8.64%
2008	rr_AnnualReturn2008	(41.68%)
2009	rr_AnnualReturn2009	49.58%
2010	rr_AnnualReturn2010	18.59%
2011	rr_AnnualReturn2011	(18.53%)
2012	rr_AnnualReturn2012	30.09%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	33.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.69%)
1 Year	rr_AverageAnnualReturnYear01	22.93%
5 Years	rr_AverageAnnualReturnYear05	0.71%
10 Years	rr_AverageAnnualReturnYear10	9.77%
Federated International Leaders Fund | B
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	5.50%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.61%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.37%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	2.25%
1 Year	rr_ExpenseExampleYear01	790
3 Years	rr_ExpenseExampleYear03	1,139
5 Years	rr_ExpenseExampleYear05	1,465
10 Years	rr_ExpenseExampleYear10	2,532
1 Year	rr_ExpenseExampleNoRedemptionYear01	240
3 Years	rr_ExpenseExampleNoRedemptionYear03	739
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,265
10 Years	rr_ExpenseExampleNoRedemptionYear10	2,532
1 Year	rr_AverageAnnualReturnYear01	23.56%
5 Years	rr_AverageAnnualReturnYear05	0.71%
10 Years	rr_AverageAnnualReturnYear10	9.72%
Federated International Leaders Fund | C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.61%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.37%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	2.25%
1 Year	rr_ExpenseExampleYear01	340
3 Years	rr_ExpenseExampleYear03	739
5 Years	rr_ExpenseExampleYear05	1,265
10 Years	rr_ExpenseExampleYear10	2.706
1 Year	rr_ExpenseExampleNoRedemptionYear01	240
3 Years	rr_ExpenseExampleNoRedemptionYear03	739
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,265
10 Years	rr_ExpenseExampleNoRedemptionYear10	2.706
1 Year	rr_AverageAnnualReturnYear01	28.06%
5 Years	rr_AverageAnnualReturnYear05	1.09%
10 Years	rr_AverageAnnualReturnYear10	9.57%
Federated International Leaders Fund | IS
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fee (as a percentage of Amount Redeemed)	rr_RedemptionFeeOverRedemption	none
Exchange Fee	rr_ExchangeFeeOverRedemption	none
Management Fee	rr_ManagementFeesOverAssets	1.00%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.36%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.37%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	0.12%	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.25%
1 Year	rr_ExpenseExampleYear01	139
3 Years	rr_ExpenseExampleYear03	434
5 Years	rr_ExpenseExampleYear05	750
10 Years	rr_ExpenseExampleYear10	1,646
1 Year	rr_ExpenseExampleNoRedemptionYear01	139
3 Years	rr_ExpenseExampleNoRedemptionYear03	434
5 Years	rr_ExpenseExampleNoRedemptionYear05	750
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,646
1 Year	rr_AverageAnnualReturnYear01	30.41%
5 Years	rr_AverageAnnualReturnYear05	1.99%
10 Years	rr_AverageAnnualReturnYear10	10.46%
Return After Taxes on Distributions | Federated International Leaders Fund | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	22.59%
5 Years	rr_AverageAnnualReturnYear05	0.70%
10 Years	rr_AverageAnnualReturnYear10	9.58%
Return After Taxes on Distributions and Sale of Fund Shares | Federated International Leaders Fund | A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	14.90%
5 Years	rr_AverageAnnualReturnYear05	0.69%
10 Years	rr_AverageAnnualReturnYear10	8.74%
Morgan Stanley Capital International Europe, Australasia and Far East Index (reflects no deduction for fees, expenses or taxes) | Federated International Leaders Fund
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	17.32%	[2]
5 Years	rr_AverageAnnualReturnYear05	(3.69%)	[2]
10 Years	rr_AverageAnnualReturnYear10	8.21%	[2]

[1] The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Tax Reclaim Recovery Expenses) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.49%, 2.24%, 2.24% and 1.24% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[2] The Morgan Stanley Capital International Europe, Australasia and Far East Index is an unmanaged market capitalization-weighted equity index comprising 21 of the 46 countries in the Morgan Stanley Capital International universe and representing the developed world outside of North America. MSCI Index (Net) returns are calculated after taking into account dividend withholding rates applicable to non-resident persons who do not benefit from double taxation treaties. However, withholding rates applicable to the Fund may be lower.

XML

Document and Entity Information	12 Months Ended
	Jan. 31, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Nov. 30, 2012
Registrant Name	FEDERATED WORLD INVESTMENT SERIES INC
Central Index Key	0000918199
Amendment Flag	false
Document Creation Date	Jan. 28, 2013
Document Effective Date	Jan. 28, 2013
Prospectus Date	Jan. 31, 2013

XML

Federated International Small-Mid Company Fund

Federated International Small-Mid Company Fund (the "Fund")

RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE

The Fund's investment objective is to provide long-term growth of capital.

RISK/RETURN SUMMARY: FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 13.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Federated International Small-Mid Company Fund	A	B	C	IS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.50%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	none	5.50%	1.00%	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	none	none	none	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	2.00%	2.00%	2.00%	2.00%
Exchange Fee	none	none	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Federated International Small-Mid Company Fund		A	B	C	IS
Management Fee		1.25%	1.25%	1.25%	1.25%
Distribution (12b-1) Fee		0.25%	0.75%	0.75%	none
Other Expenses		0.50%	0.76%	0.76%	0.50%
Acquired Fund Fees and Expenses		0.02%	0.02%	0.02%	0.02%
Total Annual Fund Operating Expenses		2.02%	2.78%	2.78%	1.77%
Fee Waivers and/or Expense Reimbursements	[1]	0.20%	0.16%	0.16%	0.15%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements		1.82%	2.62%	2.62%	1.62%

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that the operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:

Expense Example Federated International Small-Mid Company Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	744	1,149	1,578	2,769
B	831	1,262	1,669	2,927
C	381	862	1,469	3,109
IS	180	557	959	2,084

Expense Example, No Redemption Federated International Small-Mid Company Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	744	1,149	1,578	2,769
B	281	862	1,469	2,927
C	281	862	1,469	3,109
IS	180	557	959	2,084

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 46% of the average value of its portfolio.

RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE

What are the Fund's Main Investment Strategies?

The Fund pursues its investment objective by investing at least 80% of its assets in equity securities of foreign small and mid-cap companies. For purposes of this policy, small- and mid-capitalization companies will be defined as any company with a market capitalization, at the time of purchase, within the market capitalization range of stocks included in the Fund's benchmark index, the S&P Developed ex-U.S. Small Cap Growth Index, which was approximately $26 million to $12.3 billion as of November 30, 2012. The Fund's investment adviser's process for selecting investments is bottom-up and growth-oriented. The Fund's investment adviser may invest the Fund's assets in any region of the world. It may invest in companies based in emerging markets, typically in the Far East, Latin America and Eastern Europe, as well as in companies operating in developed countries, such as those of Canada, Japan and Western Europe. The Fund may invest in exchange-traded funds, derivative contracts (such as options, swaps and futures contracts) and hybrid investments (such as notes linked to underlying securities or indices) in order to implement its investment strategy.

Because the Fund refers to small- and mid-capitalization investments in its name, the Fund will notify shareholders at least 60 days in advance of any change in its investment policies that would permit the fund to normally invest less than 80% of its assets (which includes any borrowing for investment purposes) in investments in small or mid-companies. For purposes of this limitation, small or mid companies will be defined as companies with market capitalizations similar to companies in the S&P Developed ex-U.S. Small Cap Growth Index. Such definition will be applied at the time of investment and the Fund will not be required to sell a stock because a company has grown outside the market capitalization range of small- or mid-capitalization stocks.

What are the Main Risks of Investing in the Fund?

All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include:

• Stock Market Risk. The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market.

• Risk of Foreign Investing. The foreign markets in which the Fund invests may be subject to economic or political conditions which are less favorable than those of the United States and may lack financial reporting standards or regulatory requirements comparable to those applicable to U.S. companies.

• Risk of Investing in ADRs and Domestically Traded Securities of Foreign Issuers. Because the Fund may invest in American Depositary Receipts and other domestically traded securities of foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case.

• Small-Cap Company Risk. The Fund may invest in small capitalization (or "small-cap") companies. Small-cap companies may have less liquid stock, a more volatile share price, unproven track records, a limited product or service base, and limited access to capital. The above factors could make small-cap companies more likely to fail than larger companies, and increase the volatility of the Fund's portfolio, performance and Share price.

• Mid-Cap Company Risk. The Fund may invest in mid-capitalization (or "mid-cap") companies. Mid-cap companies often have narrower markets, limited managerial and financial resources, more volatile performance and greater risk of failure, compared to larger, more established companies. These factors could increase the volatility of the Fund's portfolio, performance and Share price.

• Currency Risk. Because the exchange rates for currencies fluctuate daily, prices of the foreign securities in which the Fund invests are more volatile than prices of securities traded exclusively in the United States.

• Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivative contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries.

• Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies.

• Risk Related to Investing for Growth. Due to their relatively high valuations, growth stocks are typically more volatile than value stocks.

• Liquidity Risk. Trading opportunities are more limited for equity securities that are not widely held. This may make it more difficult to sell or buy a security at a favorable price or time. Liquidity risk also refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to.

• Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets.

• Exchange-Traded Funds Risk. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded). In addition, ETFs may be subject to the following risks that do not apply to conventional funds: (i) the market price of an ETF's shares may trade above or below their net asset value; (ii) an active trading market for an ETF's shares may not develop or be maintained; or (iii) trading of an ETF's shares may be halted if the listing exchange's officials deem such action appropriate.

• Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information, such as stock market, interest rate, credit, currency, liquidity and leverage risks.

• Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy.

• Leverage Risk. Leverage risk is created when an investment, which includes, for example, an investment in a derivative contract, exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. Investments can have these same results if their returns are based on a multiple of a specified index, security or other benchmark.

• Technology Risk. Proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance.

The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Performance: Bar Chart and Table

Risk/Return Bar Chart

The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.

Federated International Small-Mid Company Fund - A Class

The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.

Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 28.60% (quarter ended June 30, 2009). Its lowest quarterly return was (31.43)% (quarter ended September 30, 2008).

Average Annual Total Return Table

The IS class commenced operations on March 31, 2008. For the period prior to the commencement of operations for the IS class, the performance information shown is for the Fund's A class. The performance of the A class has not been adjusted to reflect the expenses of the IS class since the IS class has a lower expense ratio than the expense ratio of the A class. The performance of the A class has been adjusted to reflect the absence of sales charges and adjusted to remove any voluntary waiver of the Fund's expenses related to the A class that may have occurred during the period prior to the commencement of operations of the IS class.

In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.

(For the Period Ended December 31, 2012)

Average Annual Total Returns Federated International Small-Mid Company Fund		1 Year	5 Years	10 Years
A		15.31%	(4.17%)	11.06%
A Return After Taxes on Distributions		15.31%	(4.15%)	10.88%
A Return After Taxes on Distributions and Sale of Fund Shares		9.95%	(3.45%)	10.00%
B		15.52%	(4.24%)	11.00%
C		20.00%	(3.85%)	10.82%
IS		22.24%	(2.90%)	11.79%
S&P Developed ex-U.S. Small Cap Growth Index (reflects no deduction for fees, expenses or taxes)	[1]	17.84%	(1.39%)	11.46%

[1] The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Tax Reclaim Recovery Expenses) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.80%, 2.60%, 2.60% and 1.60% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[1] The S&P Developed ex-U.S. Small Cap Growth Index was formerly known as S&P/Citigroup EMI Growth World ex-U.S. Index. The S&P Developed ex-U.S. Small Cap Growth Index is a subset of the S&P Developed Broad Market Index. The Small Cap Index covers the lowest 15% of all publicly listed equities in the Broad Market Index within a given country with float-adjusted market values of U.S. $100 million or more and annual dollar value traded of at least U.S. $50 million in all included countries. S&P Developed ex-U.S. Small Cap Growth Index represents approximately 3,552 small-cap companies from the developed nations in North America, Europe, Africa/Middle East and Asia Pacific (excluding the United States) that exhibit strong growth characteristics.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED WORLD INVESTMENT SERIES INC
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Document Creation Date	dei_DocumentCreationDate	Jan. 28, 2013

XML

Federated International Leaders Fund

Federated International Leaders Fund (the "Fund")

RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE

The Fund's investment objective is to provide long-term capital growth.

RISK/RETURN SUMMARY: FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold Class A Shares (A), Class B Shares (B), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated funds. More information about these and other discounts is available from your financial professional and in the "What Do Shares Cost?" section of the Prospectus on page 13.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Federated International Leaders Fund	A	B	C	IS
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.50%	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable)	none	5.50%	1.00%	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price)	none	none	none	none
Redemption Fee (as a percentage of amount redeemed, if applicable)	none	none	none	none
Exchange Fee	none	none	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Federated International Leaders Fund		A	B	C	IS
Management Fee		1.00%	1.00%	1.00%	1.00%
Distribution (12b-1) Fee		0.05%	0.75%	0.75%	none
Other Expenses		0.61%	0.61%	0.61%	0.36%
Acquired Fund Fees and Expenses		0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses		1.67%	2.37%	2.37%	1.37%
Fee Waivers and/or Expense Reimbursements	[1]	0.17%	0.12%	0.12%	0.12%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements		1.50%	2.25%	2.25%	1.25%

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:

Expense Example Federated International Leaders Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	710	1,048	1,407	2,418
B	790	1,139	1,465	2,532
C	340	739	1,265	2.706
IS	139	434	750	1,646

Expense Example, No Redemption Federated International Leaders Fund (USD $)	1 Year	3 Years	5 Years	10 Years
A	710	1,048	1,407	2,418
B	240	739	1,265	2,532
C	240	739	1,265	2.706
IS	139	434	750	1,646

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 16% of the average value of its portfolio.

RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE

What are the Fund's Main Investment Strategies?

The Fund pursues its investment objective by investing primarily in a portfolio of equity securities issued by foreign companies that the Fund's investment adviser has deemed as undervalued relative to the company; the company's competitive position and/or its growth prospects. The Fund's investment adviser expects that, normally, the Fund's portfolio will be invested primarily in foreign stocks in developed markets. The Fund is permitted, however, to invest in companies from both developed (including the United States) and emerging market countries. The Fund may invest in exchange-traded funds, derivative contracts (such as options, swaps and futures contracts) and hybrid instruments (such as notes linked to underlying securities, indices or commodities) in order to implement its investment strategies. The Fund is intended to integrate the value style of investing across foreign stocks in a broader equity portfolio.

What are the Main Risks of Investing in the Fund?

All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include:

• Stock Market Risk. The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company's financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company's shares in the market.

• Risk of Foreign Investing. The foreign markets in which the Fund invests may be subject to economic or political conditions which are less favorable than those of the United States and may lack financial reporting standards or regulatory requirements comparable to those applicable to U.S. companies.

• Risk of Investing in ADRs and Domestically Traded Securities of Foreign Issuers. Because the Fund may invest in American Depositary Receipts and other domestically traded securities of foreign companies, the Fund's Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case.

• Currency Risk. Because the exchange rates for currencies fluctuate daily, prices of the foreign securities in which the Fund invests are more volatile than prices of securities traded exclusively in the United States.

• Eurozone Related Risk. A number of countries in the European Union (EU) have experienced, and may continue to experience, severe economic and financial difficulties. Additional EU member countries may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund's investments in euro-denominated securities and derivative contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries.

• Sector Risk. Because the Fund may allocate relatively more assets to certain industry sectors than others, the Fund's performance may be more susceptible to any developments which affect those sectors emphasized by the Fund.

• Risk Related to Investing for Value. Due to their relatively low valuations, value stocks are typically less volatile than growth stocks. However, value stocks may lag behind growth stocks in an up market.

• Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies.

• Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets.

• Exchange-Traded Funds Risk. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded). In addition, ETFs may be subject to the following risks that do not apply to conventional funds: (i) the market price of an ETF's shares may trade above or below their net asset value; (ii) an active trading market for an ETF's shares may not develop or be maintained; or (iii) trading of an ETF's shares may be halted if the listing exchange's officials deem such action appropriate.

• Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information, such as stock market, interest rate, credit, currency, liquidity and leverage risks.

• Liquidity Risk. Trading opportunities are more limited for equity securities that are not widely held. This may make it more difficult to sell or buy a security at a favorable price or time. Liquidity risk also refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to.

• Leverage Risk. Leverage risk is created when an investment, which includes, for example, an investment in a derivative contract, exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. Investments can have these same results if their returns are based on a multiple of a specified index, security or other benchmark.

• Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy.

• Technology Risk. Proprietary and third-party data systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance.

The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Performance: Bar Chart and Table

Risk/Return Bar Chart

The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's A class total returns on a calendar year-by-year basis. The Fund changed its investment strategy on September 4, 2003. Until that time, the Fund invested primarily in securities of companies in the financial services industry. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.

Federated International Leaders Fund - A Class

The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.

Within the periods shown in the bar chart, the Fund's A class highest quarterly return was 33.12% (quarter ended June 30, 2009). Its lowest quarterly return was (25.69)% (quarter ended September 30, 2011).

Average Annual Total Return Table

The Fund's IS class commenced operations on June 21, 2010. For the period prior to the commencement of operations of the IS class, the performance information shown is for the A class. The performance of the A class has not been adjusted to reflect the expenses applicable to the IS class since IS class has a lower expense ratio than the expense ratio of A class. The performance of A class has been adjusted to reflect the absence of sales charges and adjusted to remove any voluntary waiver of Fund expenses related to A class that may have occurred during the period prior to commencement of operations of IS class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for B, C and IS classes will differ from those shown below for A class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.

(For the Period Ended December 31, 2012)

Average Annual Total Returns Federated International Leaders Fund		1 Year	5 Years	10 Years
A		22.93%	0.71%	9.77%
A Return After Taxes on Distributions		22.59%	0.70%	9.58%
A Return After Taxes on Distributions and Sale of Fund Shares		14.90%	0.69%	8.74%
B		23.56%	0.71%	9.72%
C		28.06%	1.09%	9.57%
IS		30.41%	1.99%	10.46%
Morgan Stanley Capital International Europe, Australasia and Far East Index (reflects no deduction for fees, expenses or taxes)	[1]	17.32%	(3.69%)	8.21%

[1] The Adviser and its affiliates have voluntarily agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses (excluding Acquired Fund Fees and Expenses and Tax Reclaim Recovery Expenses) paid by the Fund's A, B, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.49%, 2.24%, 2.24% and 1.24% (the "Fee Limit"), respectively, up to but not including the later of (the "Termination Date"): (a) February 1, 2014; or (b) the date of the Fund's next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Fund's Board of Directors.

[1] The Morgan Stanley Capital International Europe, Australasia and Far East Index is an unmanaged market capitalization-weighted equity index comprising 21 of the 46 countries in the Morgan Stanley Capital International universe and representing the developed world outside of North America. MSCI Index (Net) returns are calculated after taking into account dividend withholding rates applicable to non-resident persons who do not benefit from double taxation treaties. However, withholding rates applicable to the Fund may be lower.