0001104659-11-008413.txt : 20130131 0001104659-11-008413.hdr.sgml : 20130131 20110218161843 ACCESSION NUMBER: 0001104659-11-008413 CONFORMED SUBMISSION TYPE: 485BPOS PUBLIC DOCUMENT COUNT: 15 FILED AS OF DATE: 20110218 DATE AS OF CHANGE: 20110218 EFFECTIVENESS DATE: 20110218 FILER: COMPANY DATA: COMPANY CONFORMED NAME: SEI INSTITUTIONAL INVESTMENTS TRUST CENTRAL INDEX KEY: 0000939934 IRS NUMBER: 000000000 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1933 Act SEC FILE NUMBER: 033-58041 FILM NUMBER: 11624728 BUSINESS ADDRESS: STREET 1: 1 FREEDOM VALLEY DRIVE CITY: OAK STATE: PA ZIP: 19456 BUSINESS PHONE: 610 676-3097 MAIL ADDRESS: STREET 1: 1 FREEDOM VALLEY DRIVE CITY: OAK STATE: PA ZIP: 19456 FILER: COMPANY DATA: COMPANY CONFORMED NAME: SEI INSTITUTIONAL INVESTMENTS TRUST CENTRAL INDEX KEY: 0000939934 IRS NUMBER: 000000000 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 485BPOS SEC ACT: 1940 Act SEC FILE NUMBER: 811-07257 FILM NUMBER: 11624729 BUSINESS ADDRESS: STREET 1: 1 FREEDOM VALLEY DRIVE CITY: OAK STATE: PA ZIP: 19456 BUSINESS PHONE: 610 676-3097 MAIL ADDRESS: STREET 1: 1 FREEDOM VALLEY DRIVE CITY: OAK STATE: PA ZIP: 19456

0000939934 S000031047 SIIT Ultra Short Duration Bond Fund

C000096276 Class A

485BPOS 1 a10-20498_6485bpos.htm 485BPOS

As filed with the Securities and Exchange Commission on February 18, 2011.

File No. 033-58041
File No. 811-07257

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

POST-EFFECTIVE AMENDMENT NO. 50 x

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940

AMENDMENT NO. 51 x

SEI INSTITUTIONAL INVESTMENTS TRUST

(Exact Name of Registrant as Specified in Charter)

SEI Investments Company
One Freedom Valley Drive
Oaks, Pennsylvania 19456
(Address of Principal Executive Offices, Zip Code)

Registrant’s Telephone Number, including Area Code 610-676-1000

Timothy D. Barto
SEI Investments Company
One Freedom Valley Drive
Oaks, Pennsylvania 19456
(Name and Address of Agent for Service)

Copy to:

Timothy W. Levin, Esquire
Morgan, Lewis & Bockius LLP
1701 Market Street
Philadelphia, Pennsylvania 19103

Title of Securities Being Registered Units of Beneficial Interest

It is proposed that this filing will become effective (check appropriate box):

x  immediately upon filing pursuant to paragraph (b)
o  on [date] pursuant to paragraph (b)
o  60 days after filing pursuant to paragraph (a)(1) of Rule 485
o  on [date] pursuant to paragraph (a)(1) of Rule 485
o  75 days after filing pursuant to paragraph (a)(2)
o  on [date] pursuant to paragraph (a)(2).

If appropriate check the following box:

o 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, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment No. 50 to Registration Statement No. 033-58041 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Oaks, Commonwealth of Pennsylvania on the 18th day of February, 2011.

	SEI Institutional Investments Trust

	By:	/s/ Robert A. Nesher
	Robert A. Nesher
	Trustee, President & Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date(s) indicated.

*		Trustee	February 18, 2011
Rosemarie B. Greco

*		Trustee	February 18, 2011
William M. Doran

*		Trustee	February 18, 2011
George J. Sullivan, Jr.

*		Trustee	February 18, 2011
Nina Lesavoy

*		Trustee	February 18, 2011
James M. Williams

*		Trustee	February 18, 2011
Mitchell A. Johnson

*		Trustee	February 18, 2011
Hubert L. Harris, Jr.

/s/ Robert A. Nesher		Trustee, President & Chief Executive Officer	February 18, 2011
Robert A. Nesher

/s/ Stephen F. Panner		Controller & Chief Financial Officer	February 18, 2011
Stephen F. Panner

*By:	/s/ Robert A. Nesher
	Robert A. Nesher
	Attorney-in-Fact

EXHIBIT INDEX

Exhibit Number		Description

Ex-101.INS		XBRL Instance Document
Ex-101.SCH		XBRL Taxonomy Extension Schema Document
Ex-101.CAL		XBRL Taxonomy Extension Calculation Linkbase Document
Ex-101.DEF		XBRL Taxonomy Extension Definition Linkbase Document.
Ex-101.LAB		XBRL Taxonomy Extension Labels Linkbase Documen
Ex-101.PRE		XBRL Taxonomy Extension Presentation Linkbase Document

EX-101.INS 2 ck0000939934-20101231.xml XBRL INSTANCE DOCUMENT SEI INSTITUTIONAL INVESTMENTS TRUST 2011-01-21 2011-01-31 2010-12-31 485BPOS 0000939934 false 2011-01-21 EXAMPLE Investment Goal Loss of money is a risk of investing in the Fund. Principal Risks Although your actual costs and returns might be different, your approximate costs of investing $10,000 in the Fund would be: Performance Information <pre>Under normal circumstances the Ultra Short Duration Bond Fund invests at least 80% of its net assets in investment grade U.S. dollar-denominated debt instruments, including: (i) commercial paper and other corporate obligations; (ii) certificates of deposit, time deposits, bankers' acceptances, bank notes and other obligations of U.S. savings and loan and thrift institutions, U.S. commercial banks (including foreign branches of such banks), and foreign banks, that meet certain asset requirements; (iii) U.S. Treasury obligations and obligations issued or guaranteed as to principal and interest by agencies or instrumentalities of the U.S. Government; (iv) mortgage-backed securities; (v) asset-backed securities; (vi) fully-collateralized repurchase agreements involving any of the foregoing obligations; and (vii) U.S. dollar-denominated instruments of foreign issuers. In addition, the Fund may invest in futures contracts, options, swaps and other similar instruments. The primary derivatives used by the Fund are futures contracts, options, interest rate swaps and credit default swaps. The Fund will primarily use futures contracts for hedging purposes to manage the Fund's exposure to interest rate risk. There will be times when the Fund utilizes futures contracts to take an active position to either add or reduce the interest rate sensitivity of the Fund. The Fund will primarily use options and swaps to either mitigate the Fund's overall level of risk or to gain exposure to a particular fixed income security or segment of the fixed income market. Using a top-down strategy and bottom-up security selection, the Sub-Adviser seeks attractively-valued securities that offer competitive yields, and that are issued by issuers that are on a sound financial footing. The Sub-Adviser also considers factors such as the anticipated level of interest rates, relative valuations and yield spreads among various sectors, and the duration of the Fund's entire portfolio. Duration measures the price sensitivity of a fixed income security to changes in interest rates. For example, a five-year duration means the fixed income security will decrease in value by 5% if interest rates rise 1% and increase in value by 5% if interest rates fall 1%. While the Fund may invest in securities with any maturity or duration, the Fund will maintain a portfolio duration of 18 months or less under normal market conditions. To achieve its investment goal, the Fund may invest in one or more portfolios (each, a Portfolio) of SEI Alpha Strategy Portfolios, LP, a registered open-end investment company which was established to permit the Fund and other SEI-sponsored funds to pursue their investment strategies in an efficient manner. The Fund may invest in a Portfolio only if the Portfolio invests in securities and pursues investment strategies that are consistent with the Fund's investment strategy.</pre> ULTRA SHORT DURATION BOND FUND Portfolio Turnover <pre>Fixed Income Market Risk - The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Interest Rate Risk - The risk that the Fund's yield will decline due to falling interest rates. A rise in interest rates typically causes a fall in values of fixed income securities in which the Fund invests, while a fall in interest rates typically causes a rise in values in such securities. U.S. Government Securities Risk - Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. The Fund is also subject to the following additional risks: Mortgage-Backed Securities Risk - Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Asset-Backed Securities Risk - Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities and asset-backed securities may not have the benefit of any security interest in the related assets. Credit Risk - The risk that the issuer of a security, or the counterparty to a contract, will default or otherwise become unable to honor a financial obligation. Liquidity Risk - The risk that certain securities may be difficult or impossible to sell at the time and the price that the seller would like. The seller may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on fund management or performance. Extension Risk - The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Opportunity Risk - The risk of missing out on an investment opportunity because the assets necessary to take advantage of it are tied up in other investments. Market Risk - The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole. Prepayment Risk - The risk that with declining interest rates, fixed income securities with stated interests may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. Foreign Investment Risk - The risk that non-U.S. securities may be subject to additional risk due to, among other things, political, social and economic developments abroad, currency movements, and different legal, regulatory and tax environments. Derivatives Risk - The Fund's use of derivative instruments involves risks different from or possibly greater than the risks associated with investing directly in securities and other traditional investments. The primary risk of derivative instruments is that changes in the market value of securities held by the Fund, and of the derivative instruments relating to those securities, may not be proportionate. The Fund's use of derivatives is subject to credit risk, liquidity risk, market risk, leverage risk, valuation risk and correlation risk. The credit, liquidity and market risks relating to the Fund's use of derivatives are discussed above. Leverage risk is the risk that a small percentage of assets invested in derivatives can have a disproportionately larger impact on the Fund. Valuation risk is the risk that a particular derivative may be difficult to value. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. These risks could cause the Fund to lose more than the principal amount invested. The primary risks of futures and options include leverage risk, market risk, correlation risk and liquidity risk. The primary risks of swaps include credit risk, market risk, leverage risk, valuation risk and liquidity risk. Investment Company Risk - When the Fund invests in an investment company, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the investment company's expenses. In addition, while the risks of owning shares of an investment company generally reflect the risks of owning the underlying investments of the investment company, the Fund may be subject to additional or different risks than if the Fund had invested directly in the underlying investments. For example, the lack of liquidity in an exchange-traded fund could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk - The risk that short-duration fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Loss of money is a risk of investing in the Fund.</pre> Fees and Expenses Principal Investment Strategies <pre>As of January 31, 2011, the Fund had not yet commenced operations, and did not have a performance history.</pre> <pre>This table describes the fees and expenses that you may pay if you buy and hold Fund shares.</pre> <div style="display:none">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div> ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) <pre>The Fund will pay 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.</pre> <div style="display:none">~ http://xbrl.sec.gov/rr/role/ExpenseExample column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div> <pre>Provide higher current income than that typically offered by a money market fund while maintaining a high degree of liquidity and a correspondingly higher risk of principal volatility.</pre> <pre>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 in the Fund for the time periods indicated and that you sell your shares at the end of each period. The Example also assumes that each year your investment has a 5% return and Fund operating expenses remain the same.</pre> 0.0015 0.0015 31 97 0.00 0.0030 0000939934 ck0000939934:S000031047Memberck0000939934:C000096276Member 2010-01-22 2011-01-21 0000939934 ck0000939934:S000031047Member 2010-01-22 2011-01-21 0000939934 2010-01-22 2011-01-21 pure iso4217:USD Other expenses are based on estimated amounts for the current fiscal year. 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Operating Expense, Closing Expense Example: Expense Example, By Year, Caption Expense Example, By Year, Column Name Expense Example, By Year, Heading Expense Example Closing: Expense Example, Closing Expense Example, Footnotes Expense Example, Heading Expense Example Narrative: Expense Example, Narrative Expense Example, No Redemption: Expense Example, No Redemption, By Year, Caption Expense Example, No Redemption, By Year, Column Name Expense Example, No Redemption, Narrative Expense Example, No Redemption [Table] Expense Example, No Redemption, 1 Year Expense Example, No Redemption, 3 Years Expense Example, No Redemption, 5 Years Expense Example, No Redemption, 10 Years Expense Example, With Redemption [Table] Expense Example, With Redemption, 1 Year Expense Example, With Redemption, 3 Years Expense Example, With Redemption, 5 Years Expense Example, With Redemption, 10 Years Expense, Exchange Traded Fund, Commissions Expense Footnotes: Expense, Footnotes Expense, Heading Expense, Narrative Expenses: Expenses, Deferred Charges Expenses, Explanation of Nonrecurring Account Fee Expenses, Not Correlated to Ratio Due to Acquired Fund Fees Expenses, Other Expenses, Had Extraordinary Expenses Been Included Total Annual Fund Operating Expenses Expenses (as a percentage of Assets): Expenses, Range of Exchange Fees Expenses, Represent Both Master and Feeder Expenses, Restated to Reflect Current Fee Waiver or Reimbursement Fee Waiver or Reimbursement over Assets, Date of Termination Form N-1A: Highest Quarterly Return, Label Index No Deduction for Fees, Expenses, Taxes Series [Axis] Lowest Quarterly Return, Label Management Fees Market Index Performance [Table] Market Index Return: DEPRECATED Market Index Return, Inception Date DEPRECATED Market Index Return, Label DEPRECATED Market Index Return, Since inception DEPRECATED 1 Year DEPRECATED 5 Years DEPRECATED 10 Years Maximum Account Fee Maximum Account Fee (as a percentage of Assets) Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Cumulative Sales Charge (as a percentage) Maximum Deferred Sales Charge (as a percentage of Offering Price) Maximum Deferred Sales Charge (as a percentage) Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Money Market, Seven Day Tax Equivalent Yield Money Market, Seven Day Yield Money Market, Seven Day Yield, Caption Money Market, Seven Day Yield, Column Money Market, Seven Day Yield, Phone Number Net Expenses (as a percentage of Assets) Net Expenses (as a percentage of Assets): Investment Objective, Heading investment Objective, Primary Investment Objective, Secondary Objective Section: Operating Expenses: Operating Expenses, Caption Operating Expenses, Column Name Other Expenses, New Fund, Based on Estimates Other Expenses Other Expenses over Assets: Performance, Additional Market Index Performance, Availability Phone Number Performance, 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The document type should be limited to the same value as the supporting SEC submission type. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, NCSR, N-Q, and Other.No authoritative reference available.falsefalseDocument Type4false0dei_DocumentPeriodEndDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002010-12-31falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements this will be the filing date. The format of the date is CCYY-MM-DD.No authoritative reference available.falsefalseDocument Period End Date5false0dei_EntityRegistrantNamedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00SEI INSTITUTIONAL INVESTMENTS TRUSTfalsefalsefalsefalsefalseOtherxbrli:normalizedStringItemTypenormalizedstringThe exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalseRegistrant Name6false0dei_EntityCentralIndexKeydeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse000000939934falsefalsefalsefalsefalseOtherus-types:centralIndexKeyItemTypenaA unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 falsefalseCentral Index Key7false0dei_AmendmentFlagdeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalsefalseOtherxbrli:booleanItemTypenaIf the value is true, then the document as an amendment to previously-filed/accepted document.No authoritative reference available.falsefalseAmendment Flag8false0dei_DocumentCreationDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-21falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date the document was made available and submitted, in CCYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.No authoritative reference available.falsefalseDocument Creation Date9false0dei_DocumentEffectiveDatedeifalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-31falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date when a document, upon receipt and acceptance, becomes officially effective, in CCYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.No authoritative reference available.falsefalseDocument Effective Date10false0rr_ProspectusDaterrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse002011-01-21falsefalsetruefalsefalseOtherxbrli:dateItemTypedateThe date of the prospectus.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 1 -Paragraph 3 -Subsection a falsefalseProspectusDate11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsetruefalse{dei_LegalEntityAxis} : SIIT Ultra Short Duration Bond Fund1/22/2010 - 1/21/2011 eol_0001104659-11-002363_STD_365_20110121_0_396770x-9995952http://www.sec.gov/CIK0000939934duration2010-01-22T00:00:002011-01-21T00:00:00falsefalseSIIT Ultra Short Duration Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_S000031047Memberdei_LegalEntityAxisexplicitMemberOthernaNo definition available.No authoritative reference available.falsefalseSIIT Ultra Short Duration Bond Fund12true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRisk/Return:13false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00ULTRA SHORT DURATION BOND FUNDfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalseRisk/Return, Heading14false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Investment GoalfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseInvestment Objective, Heading15false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Provide higher current income than that typically offered by a money market fundwhile maintaining a high degree of liquidity and a correspondingly higher risk of principal volatility.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseinvestment Objective, Primary16false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Fees and ExpensesfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared 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 $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. 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 may indicate higher transaction costs. 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 __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalseExpense, Heading17false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>This table describes the fees and expenses that you may pay if you buy and holdFund shares.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared 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 $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalseExpense, Narrative18false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalseOperating Expenses, Caption19false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Portfolio TurnoverfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalsePortfolio Turnover, Heading20false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>The Fund will pay transaction costs, such as commissions, when it buys and sellssecurities (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.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalsePortfolio Turnover21false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00EXAMPLEfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example, Heading22false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>This Example is intended to help you compare the cost of investing in the Fundwith the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and that you sell your shares at the end of each period. The Example also assumes that each year your investment has a 5% return and Fund operating expenses remain the same.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalseExpense Example, Narrative23false0rr_ExpenseExampleByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Although your actual costs and returns might be different, your approximate costs of investing $10,000 in the Fund would be:falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example, By Year, Caption24false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Principal Investment StrategiesfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseInvestment Strategy, Heading25false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Under normal circumstances the Ultra Short Duration Bond Fund invests at least80% of its net assets in investment grade U.S. dollar-denominated debt instruments, including: (i) commercial paper and other corporate obligations; (ii) certificates of deposit, time deposits, bankers' acceptances, bank notes and other obligations of U.S. savings and loan and thrift institutions, U.S. commercial banks (including foreign branches of such banks), and foreign banks, that meet certain asset requirements; (iii) U.S. Treasury obligations and obligations issued or guaranteed as to principal and interest by agencies or instrumentalities of the U.S. Government; (iv) mortgage-backed securities; (v) asset-backed securities; (vi) fully-collateralized repurchase agreements involving any of the foregoing obligations; and (vii) U.S. dollar-denominated instruments of foreign issuers. In addition, the Fund may invest in futures contracts, options, swaps and other similar instruments. The primary derivatives used by the Fund are futures contracts, options, interest rate swaps and credit default swaps. The Fund will primarily use futures contracts for hedging purposes to manage the Fund's exposure to interest rate risk. There will be times when the Fund utilizes futures contracts to take an active position to either add or reduce the interest rate sensitivity of the Fund. The Fund will primarily use options and swaps to either mitigate the Fund's overall level of risk or to gain exposure to a particular fixed income security or segment of the fixed income market. Using a top-down strategy and bottom-up security selection, the Sub-Adviser seeks attractively-valued securities that offer competitive yields, and that are issued by issuers that are on a sound financial footing. The Sub-Adviser also considers factors such as the anticipated level of interest rates, relative valuations and yield spreads among various sectors, and the duration of the Fund's entire portfolio. Duration measures the price sensitivity of a fixed income security to changes in interest rates. For example, a five-year duration means the fixed income security will decrease in value by 5% if interest rates rise 1% and increase in value by 5% if interest rates fall 1%. While the Fund may invest in securities with any maturity or duration, the Fund will maintain a portfolio duration of 18 months or less under normal market conditions. To achieve its investment goal, the Fund may invest in one or more portfolios (each, a Portfolio) of SEI Alpha Strategy Portfolios, LP, a registered open-end investment company which was established to permit the Fund and other SEI-sponsored funds to pursue their investment strategies in an efficient manner. The Fund may invest in a Portfolio only if the Portfolio invests in securities and pursues investment strategies that are consistent with the Fund's investment strategy.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseInvestment Strategy, Narrative26false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Principal RisksfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalseRisk, Heading27false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Fixed Income Market Risk - The prices of the Fund's fixed income securitiesrespond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Interest Rate Risk - The risk that the Fund's yield will decline due to falling interest rates. A rise in interest rates typically causes a fall in values of fixed income securities in which the Fund invests, while a fall in interest rates typically causes a rise in values in such securities. U.S. Government Securities Risk - Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. The Fund is also subject to the following additional risks: Mortgage-Backed Securities Risk - Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Asset-Backed Securities Risk - Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities and asset-backed securities may not have the benefit of any security interest in the related assets. Credit Risk - The risk that the issuer of a security, or the counterparty to a contract, will default or otherwise become unable to honor a financial obligation. Liquidity Risk - The risk that certain securities may be difficult or impossible to sell at the time and the price that the seller would like. The seller may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on fund management or performance. Extension Risk - The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Opportunity Risk - The risk of missing out on an investment opportunity because the assets necessary to take advantage of it are tied up in other investments. Market Risk - The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole. Prepayment Risk - The risk that with declining interest rates, fixed income securities with stated interests may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. Foreign Investment Risk - The risk that non-U.S. securities may be subject to additional risk due to, among other things, political, social and economic developments abroad, currency movements, and different legal, regulatory and tax environments. Derivatives Risk - The Fund's use of derivative instruments involves risks different from or possibly greater than the risks associated with investing directly in securities and other traditional investments. The primary risk of derivative instruments is that changes in the market value of securities held by the Fund, and of the derivative instruments relating to those securities, may not be proportionate. The Fund's use of derivatives is subject to credit risk, liquidity risk, market risk, leverage risk, valuation risk and correlation risk. The credit, liquidity and market risks relating to the Fund's use of derivatives are discussed above. Leverage risk is the risk that a small percentage of assets invested in derivatives can have a disproportionately larger impact on the Fund. Valuation risk is the risk that a particular derivative may be difficult to value. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. These risks could cause the Fund to lose more than the principal amount invested. The primary risks of futures and options include leverage risk, market risk, correlation risk and liquidity risk. The primary risks of swaps include credit risk, market risk, leverage risk, valuation risk and liquidity risk. Investment Company Risk - When the Fund invests in an investment company, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the investment company's expenses. In addition, while the risks of owning shares of an investment company generally reflect the risks of owning the underlying investments of the investment company, the Fund may be subject to additional or different risks than if the Fund had invested directly in the underlying investments. For example, the lack of liquidity in an exchange-traded fund could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk - The risk that short-duration fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Loss of money is a risk of investing in the Fund.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalseRisk, Narrative28false0rr_RiskLoseMoneyrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Loss of money is a risk of investing in the Fund.falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSummarize the principal risks of investing in the Fund, including the risks to which the Fund's portfolio as a whole is subject and the circumstances reasonably likely to affect adversely the Fund's net asset value, yield, and total return. Unless the Fund is a Money Market Fund, disclose that loss of money is a risk of investing in the Fund. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Subsection b falsefalseRisk, Lose Money29false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Performance InformationfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalseBar Chart and Performance Table, Heading30false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>As of January 31, 2011, the Fund had not yet commenced operations, and did nothave a performance history.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalsePerformance, Narrative31false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://xbrl.sec.gov/rr/role/riskreturndetaildata1falsefalsefalse00falsefalsefalsefalsefalse3falsefalseUSDtruefalse{dei_LegalEntityAxis} : SIIT Ultra Short Duration Bond Fund{rr_ProspectusShareClassAxis} : Class A 1/22/2010 - 1/21/2011 USD ($) $eol_0001104659-11-002363_STD_365_20110121_0_396770x-9995952_429423x-9995953http://www.sec.gov/CIK0000939934duration2010-01-22T00:00:002011-01-21T00:00:00falsefalseSIIT Ultra Short Duration Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_S000031047Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_C000096276Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepure0iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseSIIT Ultra Short Duration Bond Fund | Class A32true0rr_RiskReturnAbstractrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRisk/Return:33false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalseManagement Fees34false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.000.00falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalseDistribution (12b-1) Fees35false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015[1]falsefalsefalsefalsefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalseOther Expenses36false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00300.0030falsefalsefalsefalsefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalseTotal Annual Fund Operating Expenses37false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue3131falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example, With Redemption, 1 Year38false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue9797falsetruefalsefalsefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example, With Redemption, 3 Years1Other expenses are based on estimated amounts for the current fiscal year.137Risk/Return Detail Data (USD $)NoRoundingUnKnownUnKnownUnKnowntruetrue ZIP 1011 0001104659-11-008413-xbrl.zip IDEA: XBRL DOCUMENT begin 644 0001104659-11-008413-xbrl.zip M4$L#!!0````(`%V"4CZMP$.&RA4``,I*```9`!P`8VLP,#`P.3,Y.3,T+3(P M,3`Q,C,Q+GAM;%54"0`#0>)>34'B7DUU>`L``00E#@``!#D!``#=7%MSVT:6 M?E>5_D,O=Y.RMTA*E"P[4FQ/R9:YV)B._D>OI]3IR4_'E^ICEII,J[/>>UU8 M\Z!^C76J;53@449[8ZU.\KB/^SO-=];6FQV`5# M<5\=IZFZI*5.76JG[5PG?0_J86A3!:EF[E6GP18][N=VO`.X^SO&2Z4C*X_H M;?J)]4!]1V*KUM.#UOK[?5X].#P\W.&W8:EQ^;.]P8M/$2,K*MC.K(.,I8.= M7]^?7\43/8UZRQS$=[OX[W#_\'#_66N[TR9F/4*6NX.]_4'8D>@:#Q-4NAT\ M(T2'I*9ZI;7MA4['_7$^W[&6@?9V]WI[/]2+>W&4;MI`[]9O2O1HXR:\6[\) M]KQQ$]ZMWS2S>N,FO%NS"8YH\U2[%7F%%VN$AE?%8K9^#[]8LX>6)$M:\;I_ MOB,O6TN+M4L/9&G1@3LHQ0Z1'CDVFTL]4FR=1T3"JXXSTUE*-L3/(AL3-U_F M![QC8DEK3=OK!3/K/[CD*]SERSUQ1]B#R1Z=9H4I%I=Z;%QAHZSX$$VUBO.L MT`_%)5&H\_06)`X&N\^>'QSV*`[M[NT_W[^]NCZYW7]^<$N!!F0/;G<[KZ]. 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XML 1013 R1.xml IDEA: Risk/Return Summary 2.2.0.25truefalse010000 - Document - Risk/Return Summary {Unlabeled}falsefalsetrue1falsefalsetruefalse{dei_LegalEntityAxis} : SIIT Ultra Short Duration Bond Fund 1/22/2010 - 1/21/2011 eol_0001104659-11-002363_STD_365_20110121_0_396770x-9995952http://www.sec.gov/CIK0000939934duration2010-01-22T00:00:002011-01-21T00:00:00falsefalseck0000939934_S000031047Memberdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_S000031047Memberdei_LegalEntityAxisexplicitMember3false0rr_RiskReturnHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00ULTRA SHORT DURATION BOND FUNDfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Investment Objectives/Goals Include the following information, in plain English under rule 421(d) under the Securities Act, in the order and subject matter indicatedReference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 falsefalseRisk/Return, Heading4false0rr_ObjectiveHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Investment GoalfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseInvestment Objective, Heading5false0rr_ObjectivePrimaryTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Provide higher current income than that typically offered by a money market fundwhile maintaining a high degree of liquidity and a correspondingly higher risk of principal volatility.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringInvestment Objectives/Goals. Disclose the Fund's investment objectives or goals. A Fund also may identify its type or category (e.g., that it is a Money Market Fund or a balanced fund).Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 2 -Subsection a falsefalseinvestment Objective, Primary6false0rr_ExpenseHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Fees and ExpensesfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Summary Fee Table Includes the following information, in plain English under rule 421(d) under the Securities Act, after Item 2 Fees and expenses of the Fund This table describes the fees and expenses that you may pay if you buy and hold shared 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 $[_____] in [name of fund family] funds. Shareholder Fees (fees paid directly from your investment) 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 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be You would pay the following expenses if you did not redeem your shares The Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. If these sales charges (loads) were included, your costs would be higher. 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 may indicate higher transaction costs. 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 __% of the average value of its whole portfolio. Instructions. A.3.instructions.6 New Funds. For purposes of this Item, a "New Fund" is a Fund that does not include in Form N-1A financial statements reporting operating results or that includes financial statements for the Fund's initial fiscal year reporting operating results for a period of 6 months or less. The following Instructions apply to New Funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph d -Subsection instructions falsefalseExpense, Heading7false0rr_ExpenseNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>This table describes the fees and expenses that you may pay if you buy and holdFund shares.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis table describes the fees and expenses that you may pay if you buy and hold shared 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 $[_____] in [name of fund family] funds. Include the narrative explanations in the order indicated. A Fund may modify the narrative explanations if the explanation contains comparable information to that shown.The narrative explanation regarding sales charge discounts is only required by a Fund that offers such discounts and should specify the minimum level of investment required to qualify for a discount. Modify the narrative explanation to state that Fund shares are sold on a national securities exchange at the end of the time periods indicated, and that brokerage commissions for buying and selling Fund shares through a broker are not reflected.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph b -Subsection instructions falsefalseExpense, Narrative8false0rr_OperatingExpensesCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringAnnual Fund Operating Expenses (ongoing expenses that you pay each year as a percentage of the value of your investment)Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 7 -Subsection table falsefalseOperating Expenses, Caption9false0rr_AnnualFundOperatingExpensesTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div style="display:none">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div>falsefalse<div style="display:none">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div>falsehttp://xbrl.sec.gov/rr/role/OperatingExpensesDatafalsefalse020020 - Schedule - Annual Fund Operating Expensestruefalsefalse1falseColumnperiodPeriod*Columndei_LegalEntityAxisAxisck0000939934_S000031047MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*duration2010-01-22T00:00:002011-01-21T00:00:00falsefalseSIIT Ultra Short Duration Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_S000031047Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_C000096276Memberrr_ProspectusShareClassAxisexplicitMemberSIIT Ultra Short Duration Bond FundClass Aiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170falseUSDfalsefalse$1falseRowprimaryElement*3false0rr_ManagementFeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph a -Subsection instructions falsefalseManagement Fees0rr_ManagementFeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015falsefalsefalsetruefalseOthernanafalsefalseManagement Fees2falseRowprimaryElement*4false0rr_DistributionAndService12b1FeesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.000.00falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 9 -Subsection table falsefalseDistribution (12b-1) Fees0rr_DistributionAndService12b1FeesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.000.00falsefalsefalsetruefalseOthernanafalsefalseDistribution (12b-1) Fees3falseRowprimaryElement*5false0rr_OtherExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00150.0015[1]falsefalsefalsetruefalseOtherrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph c -Clause i -Subsection instructions falsefalseOther Expenses0rr_OtherExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse[1]1truetruetrue0.00150.0015falsefalsefalsetruefalseOthernanafalsefalseOther Expenses4falseRowprimaryElement*6false0rr_ExpensesOverAssetsrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00300.0030falsefalsefalsetruefalseOtherrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subparagraph d -Subsection instructions falsefalseTotal Annual Fund Operating Expenses0rr_ExpensesOverAssetstruefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truetruetrue0.00300.0030falsefalsefalsetruefalseOthernanafalsefalseTotal Annual Fund Operating Expenses1Other expenses are based on estimated amounts for the current fiscal year.14Annual Fund Operating ExpensesUnKnownUnKnownUnKnownUnKnownfalsetrueColumnperiodPeriod*Columndei_LegalEntityAxisAxisck0000939934_S000031047MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No authoritative reference available.falsefalseAnnual Fund Operating Expenses [Table]10false0rr_ExpenseExampleHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00EXAMPLEfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringHeading for Expense Example.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example, Heading11false0rr_ExpenseExampleNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>This Example is intended to help you compare the cost of investing in the Fundwith the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and that you sell your shares at the end of each period. The Example also assumes that each year your investment has a 5% return and Fund operating expenses remain the same.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 1 -Subsection example falsefalseExpense Example, Narrative12false0rr_ExpenseExampleByYearCaptionrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Although your actual costs and returns might be different, your approximate costs of investing $10,000 in the Fund would be:falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example, By Year, Caption13false0rr_ExpenseExampleWithRedemptionTableTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div style="display:none">~ http://xbrl.sec.gov/rr/role/ExpenseExample column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div>falsefalse<div style="display:none">~ http://xbrl.sec.gov/rr/role/ExpenseExample column dei_LegalEntityAxis compact ck0000939934_S000031047Member column rr_ProspectusShareClassAxis compact * row primary compact * ~</div>truehttp://xbrl.sec.gov/rr/role/ExpenseExamplefalsefalse020030 - Schedule - Expense Example {Transposed}truefalsefalse1falseColumnprimaryElement*3false0rr_ExpenseExampleYear01rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue3131falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 4 -Subsection instructions falsefalseExpense Example, With Redemption, 1 YearfalseUSDfalsefalse$2falseColumnprimaryElement*4false0rr_ExpenseExampleYear03rrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue9797falsefalsefalsetruefalseMonetaryrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 1 -Subparagraph 2 -Subsection example falsefalseExpense Example, With Redemption, 3 YearsfalseUSDfalsefalse$1falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000939934_S000031047MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2010-01-22T00:00:002011-01-21T00:00:00falsefalseSIIT Ultra Short Duration Bond Funddei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_S000031047Memberdei_LegalEntityAxisexplicitMemberfalsefalseClass Arr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000939934_C000096276Memberrr_ProspectusShareClassAxisexplicitMemberSIIT Ultra Short Duration Bond FundClass Aiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso421700truefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue3131falsefalsefalsetruefalse2truefalsetrue9797falsefalsefalsetruefalseOthernanafalsefalseSIIT Ultra Short Duration Bond FundClass A21Expense Example (USD $)UnKnownUnKnownUnKnownUnKnownfalsetrueColumnprimaryElement*RowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000939934_S000031047MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsefalsefalseOtherus-types:textBlockItemTypestringContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No authoritative reference available.falsefalseExpense Example, With Redemption [Table]14false0rr_PortfolioTurnoverHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Portfolio TurnoverfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 5 -Subsection instructions falsefalsePortfolio Turnover, Heading15false0rr_PortfolioTurnoverTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>The Fund will pay transaction costs, such as commissions, when it buys and sellssecurities (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.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDisclose the portfolio turnover rate provided in response to Item 14(a) for the most recent fiscal year (or for such shorter period as the Fund has been in operation). Disclose the period for which the information is provided if less than a full fiscal year. A Fund that is a Money Market Fund may omit the portfolio turnover information required by this Item.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Paragraph 3 -Subsection example falsefalsePortfolio Turnover16false0rr_StrategyHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Principal Investment StrategiesfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseInvestment Strategy, Heading17false0rr_StrategyNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Under normal circumstances the Ultra Short Duration Bond Fund invests at least80% of its net assets in investment grade U.S. dollar-denominated debt instruments, including: (i) commercial paper and other corporate obligations; (ii) certificates of deposit, time deposits, bankers' acceptances, bank notes and other obligations of U.S. savings and loan and thrift institutions, U.S. commercial banks (including foreign branches of such banks), and foreign banks, that meet certain asset requirements; (iii) U.S. Treasury obligations and obligations issued or guaranteed as to principal and interest by agencies or instrumentalities of the U.S. Government; (iv) mortgage-backed securities; (v) asset-backed securities; (vi) fully-collateralized repurchase agreements involving any of the foregoing obligations; and (vii) U.S. dollar-denominated instruments of foreign issuers. In addition, the Fund may invest in futures contracts, options, swaps and other similar instruments. The primary derivatives used by the Fund are futures contracts, options, interest rate swaps and credit default swaps. The Fund will primarily use futures contracts for hedging purposes to manage the Fund's exposure to interest rate risk. There will be times when the Fund utilizes futures contracts to take an active position to either add or reduce the interest rate sensitivity of the Fund. The Fund will primarily use options and swaps to either mitigate the Fund's overall level of risk or to gain exposure to a particular fixed income security or segment of the fixed income market. Using a top-down strategy and bottom-up security selection, the Sub-Adviser seeks attractively-valued securities that offer competitive yields, and that are issued by issuers that are on a sound financial footing. The Sub-Adviser also considers factors such as the anticipated level of interest rates, relative valuations and yield spreads among various sectors, and the duration of the Fund's entire portfolio. Duration measures the price sensitivity of a fixed income security to changes in interest rates. For example, a five-year duration means the fixed income security will decrease in value by 5% if interest rates rise 1% and increase in value by 5% if interest rates fall 1%. While the Fund may invest in securities with any maturity or duration, the Fund will maintain a portfolio duration of 18 months or less under normal market conditions. To achieve its investment goal, the Fund may invest in one or more portfolios (each, a Portfolio) of SEI Alpha Strategy Portfolios, LP, a registered open-end investment company which was established to permit the Fund and other SEI-sponsored funds to pursue their investment strategies in an efficient manner. The Fund may invest in a Portfolio only if the Portfolio invests in securities and pursues investment strategies that are consistent with the Fund's investment strategy.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringPrincipal investment strategies of the Fund. Summarize how the Fund intends to achieve its investment objectives by identifying the Fund's principal investment strategies (including the type or types of securities in which the Fund invests or will invest principally) and any policy to concentrate in securities of issuers in a particular industry or group of industries.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Subsection a falsefalseInvestment Strategy, Narrative18false0rr_RiskHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Principal RisksfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNarrative Risk Disclosure.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subsection b falsefalseRisk, Heading19false0rr_RiskNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>Fixed Income Market Risk - The prices of the Fund's fixed income securitiesrespond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Interest Rate Risk - The risk that the Fund's yield will decline due to falling interest rates. A rise in interest rates typically causes a fall in values of fixed income securities in which the Fund invests, while a fall in interest rates typically causes a rise in values in such securities. U.S. Government Securities Risk - Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. The Fund is also subject to the following additional risks: Mortgage-Backed Securities Risk - Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Asset-Backed Securities Risk - Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities and asset-backed securities may not have the benefit of any security interest in the related assets. Credit Risk - The risk that the issuer of a security, or the counterparty to a contract, will default or otherwise become unable to honor a financial obligation. Liquidity Risk - The risk that certain securities may be difficult or impossible to sell at the time and the price that the seller would like. The seller may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on fund management or performance. Extension Risk - The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Opportunity Risk - The risk of missing out on an investment opportunity because the assets necessary to take advantage of it are tied up in other investments. Market Risk - The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole. Prepayment Risk - The risk that with declining interest rates, fixed income securities with stated interests may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. Foreign Investment Risk - The risk that non-U.S. securities may be subject to additional risk due to, among other things, political, social and economic developments abroad, currency movements, and different legal, regulatory and tax environments. Derivatives Risk - The Fund's use of derivative instruments involves risks different from or possibly greater than the risks associated with investing directly in securities and other traditional investments. The primary risk of derivative instruments is that changes in the market value of securities held by the Fund, and of the derivative instruments relating to those securities, may not be proportionate. The Fund's use of derivatives is subject to credit risk, liquidity risk, market risk, leverage risk, valuation risk and correlation risk. The credit, liquidity and market risks relating to the Fund's use of derivatives are discussed above. Leverage risk is the risk that a small percentage of assets invested in derivatives can have a disproportionately larger impact on the Fund. Valuation risk is the risk that a particular derivative may be difficult to value. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. These risks could cause the Fund to lose more than the principal amount invested. The primary risks of futures and options include leverage risk, market risk, correlation risk and liquidity risk. The primary risks of swaps include credit risk, market risk, leverage risk, valuation risk and liquidity risk. Investment Company Risk - When the Fund invests in an investment company, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the investment company's expenses. In addition, while the risks of owning shares of an investment company generally reflect the risks of owning the underlying investments of the investment company, the Fund may be subject to additional or different risks than if the Fund had invested directly in the underlying investments. For example, the lack of liquidity in an exchange-traded fund could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk - The risk that short-duration fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Loss of money is a risk of investing in the Fund.</pre>falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringNarrative Risk Disclosure. A Fund may, in responding to this Item, describe the types of investors for whom the Fund is intended or the types of investment goals that may be consistent with an investment in the Fund.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 1 -Subparagraph i -Clause instruction -Subsection b falsefalseRisk, Narrative20false0rr_BarChartAndPerformanceTableHeadingrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Performance InformationfalsefalsefalsefalsefalseOtherxbrli:stringItemTypestringRisk/Return Bar Chart and Table.Reference 1: 1 -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 4 -Paragraph 2 -Subsection b falsefalseBar Chart and Performance Table, Heading21false0rr_PerformanceNarrativeTextBlockrrfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<pre>As of January 31, 2011, the Fund had not yet commenced operations, and did 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Morgan, Lewis & Bockius LLP

1701 Market Street

Philadelphia, PA 19103-2921

Tel. 215.963.5000

Fax: 215.963.5001

www.morganlewis.com

February 18, 2011

VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: SEI Institutional Investments Trust: Post-Effective Amendment No. 50

(File No. 033-58041 and 811-07257)

Ladies and Gentlemen:

On behalf of our client, SEI Institutional Investments Trust (the “Trust”), we are filing, pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and under the Investment Company Act of 1940, as amended, Post-Effective Amendment No. 50 (“PEA No. 50”) to the Trust’s Registration Statement on Form N-1A (the “Registration Statement”). The sole purpose of PEA No. 50 is to file as an Exhibit to the Registration Statement, risk/return summary information for the Trust’s Ultra Short Duration Bond Fund in interactive data format.

I hereby certify that PEA No. 50 does not contain disclosure that renders it ineligible to be filed under Rule 485(b). If you have any questions regarding PEA No. 50, please do not hesitate to contact me at (215)963-5037.

Sincerely,

/s/ Timothy W. Levin

Timothy W. Levin

Morgan, Lewis & Bockius LLP
1701 Market Street
Philadelphia, PA 19103-2921
Tel. 215.963.5000
Fax: 215.963.5001
www.morganlewis.com