<?xml version="1.0" encoding="UTF-8" ?>
<xbrli:xbrl
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
xmlns:xbrli="http://www.xbrl.org/2003/instance"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
xmlns:dei="http://xbrl.us/dei/2009-01-31"
xmlns:rr="http://xbrl.sec.gov/rr/2010-02-28"
xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
xmlns:us-types="http://xbrl.us/us-types/2009-01-31"
xmlns:link="http://www.xbrl.org/2003/linkbase"
xmlns:vanguard="http://vanguard/20100727">
<link:schemaRef
xlink:href="convertible-20110323.xsd"
xlink:type="simple"/>
<rr:ShareholderFeesCaption
contextRef="v_Retail_S000002837">Shareholder Fees (Fees paid directly from your investment)</rr:ShareholderFeesCaption>
<rr:ShareholderFeesCaption
contextRef="v_Participant_S000002837">Shareholder Fees (Fees paid directly from your investment)</rr:ShareholderFeesCaption>
<rr:OperatingExpensesCaption
contextRef="v_Retail_S000002837">Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
<rr:OperatingExpensesCaption
contextRef="v_Participant_S000002837">Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
<rr:PerformanceTableHeading
contextRef="v_Participant_S000002837">Average Annual Total Returns for Periods Ended December 31, 2010</rr:PerformanceTableHeading>
<rr:PerformanceTableHeading
contextRef="v_Retail_S000002837">Average Annual Total Returns for Periods Ended December 31, 2010</rr:PerformanceTableHeading>
<rr:BarChartAndPerformanceTableHeading
contextRef="v_Participant_S000002837">Annual Total Returns</rr:BarChartAndPerformanceTableHeading>
<rr:ExpenseHeading
contextRef="v_Participant_S000002837">Fees and Expenses</rr:ExpenseHeading>
<rr:ObjectiveHeading
contextRef="v_Participant_S000002837">Investment Objective</rr:ObjectiveHeading>
<rr:RiskHeading
contextRef="v_Participant_S000002837">Primary Risks</rr:RiskHeading>
<rr:RiskReturnHeading
contextRef="v_Participant_S000002837">Risk/Return</rr:RiskReturnHeading>
<rr:StrategyHeading
contextRef="v_Participant_S000002837">Primary Investment Strategies</rr:StrategyHeading>
<rr:PortfolioTurnoverRate
decimals="2"
contextRef="v_Participant_S000002837"
unitRef="pure">1.03</rr:PortfolioTurnoverRate>
<rr:ProspectusDate
contextRef="v_Participant_S000002837">2011-03-23</rr:ProspectusDate>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Participant_S000002837">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:BarChartAndPerformanceTableHeading
contextRef="v_Retail_S000002837">Annual Total Returns</rr:BarChartAndPerformanceTableHeading>
<rr:ExpenseHeading
contextRef="v_Retail_S000002837">Fees and Expenses</rr:ExpenseHeading>
<rr:ObjectiveHeading
contextRef="v_Retail_S000002837">Investment Objective</rr:ObjectiveHeading>
<rr:RiskHeading
contextRef="v_Retail_S000002837">Primary Risks</rr:RiskHeading>
<rr:RiskReturnHeading
contextRef="v_Retail_S000002837">Risk/Return</rr:RiskReturnHeading>
<rr:StrategyHeading
contextRef="v_Retail_S000002837">Primary Investment Strategies</rr:StrategyHeading>
<rr:PortfolioTurnoverRate
decimals="2"
contextRef="v_Retail_S000002837"
unitRef="pure">1.03</rr:PortfolioTurnoverRate>
<rr:ProspectusDate
contextRef="v_Retail_S000002837">2011-03-23</rr:ProspectusDate>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Retail_S000002837">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:BarChartNarrativeTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of a relevant market index and other comparative benchmarks, which have investment characteristics similar to those of the Fund. As of January 1, 2011, the Fund's performance benchmark was changed to a composite benchmark consisting of 70% Bank of America Merrill Lynch All US Convertibles Index and 30% Bank of America Merrill Lynch Global 300 Convertibles ex-US Index (hedged), because the Fund's board of trustees believes that the new composite benchmark is more consistent with the Fund's investment strategy. As of January 1, 2011, the Spliced Convertibles Composite Index consists of the returns of the CS First Boston Convertible Securities Index through November 30, 2004; the Bank of America Merrill Lynch All US Convertibles Index (formerly the Bank of America Merrill Lynch All Convertibles-All Qualities Index) through December 31, 2010; and a composite index consisting of 70% Bank of America Merrill Lynch All US Convertibles Index and 30% Bank of America Merrill Lynch Global 300 Convertibles ex-US Index (hedged) thereafter. Returns for the Convertible Securities Funds Average are derived from data provided by Lipper Inc. Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.&lt;/p&gt;</rr:BarChartNarrativeTextBlock>
<rr:ExpenseExampleHeading
contextRef="v_Participant_S000002837">&lt;p&gt;Example&lt;/p&gt;</rr:ExpenseExampleHeading>
<rr:ExpenseExampleNarrativeTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. This example assumes that the Fund provides a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
<rr:ExpenseNarrativeTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
<rr:ObjectivePrimaryTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;The Fund seeks to provide current income and long-term capital appreciation.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
<rr:PortfolioTurnoverHeading
contextRef="v_Participant_S000002837">&lt;p&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
<rr:PortfolioTurnoverTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;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 previous expense example, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 103%. &lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
<rr:RiskLoseMoney
contextRef="v_Participant_S000002837">&lt;p&gt;An investment in the Fund could lose money over short or even long periods. &lt;/p&gt;</rr:RiskLoseMoney>
<rr:RiskNarrativeTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of global stock markets. The Fund's performance could be hurt by:&lt;/p&gt;&lt;p&gt;Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, investments in foreign stocks can be riskier than U.S. stock investments. The prices of foreign stocks and the prices of U.S. stocks have, at times, moved in opposite directions. &lt;/p&gt;&lt;p&gt;Interest rate risk, which is the chance that prices of convertible securities will decline along with overall bond prices because of rising interest rates. Convertible securities are particularly sensitive to interest rate changes when their predetermined conversion price is much higher than the price of the issuing company's common stock.&lt;/p&gt;&lt;p&gt;Credit risk, which is the chance that the issuer of a convertible security will fail to pay interest or dividends and principal in a timely manner, or that negative perceptions of the issuer's ability to make such payments will cause the price of that security to decline. Companies that issue convertible securities are often small to medium size, and they often have low credit ratings. In addition, the credit rating of a company's convertible securities is generally lower than that of its non-convertible debt securities. Convertibles are normally considered 'junior' securities-that is, the company usually must pay interest on its non-convertible debt before it can make payments on its convertible securities. If an issuer stops making interest or principal payments, these securities may become worthless and the Fund could lose its entire investment. Reflecting the universe of convertible securities, most of the Fund's rated holdings are below investment-grade. Therefore, credit risk is greater for the Fund than for funds that invest in higher-grade securities.&lt;/p&gt;&lt;p&gt;Manager risk, which is the chance that poor security selection or focus on securities in a particular sector, category, or group of companies will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.  &lt;/p&gt;&lt;p&gt;Liquidity risk, which is the chance that the Fund will experience market difficulty in buying or selling securities quickly enough to prevent or minimize a loss. Liquidity risk arises when there is an insufficient market for a particular security or class of securities.&lt;/p&gt;&lt;p&gt;Country/regional risk, which is the chance that world events-such as political upheaval, financial troubles, or natural disasters-will adversely affect the value of securities issued by companies in foreign countries or regions. Because the Fund may invest a large portion of its assets in securities of companies located in any one country or region,  the Fund's performance may be hurt disproportionately by the poor performance of its investments in that area.  &lt;/p&gt;&lt;p&gt;An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
<rr:StrategyNarrativeTextBlock
contextRef="v_Participant_S000002837">&lt;p&gt;The Fund invests at least 80% of its assets in U.S. and foreign convertible securities, which are hybrid securities that combine the investment characteristics of bonds and common stocks. Convertible securities include corporate bonds and preferred stocks that are convertible into common stock, as well as debt securities with warrants or common stock attached. Many convertible securities have credit ratings that are below investment grade.&lt;/p&gt;</rr:StrategyNarrativeTextBlock >
<rr:RiskNotInsuredDepositoryInstitution
contextRef="v_Participant_S000002837">&lt;p&gt;An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNotInsuredDepositoryInstitution>
<rr:PerformanceInformationIllustratesVariabilityOfReturns
contextRef="v_Participant_S000002837">&lt;p&gt;The following bar chart and table are intended to help you understand the risks of investing in the Fund.&lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
<rr:PerformanceAvailabilityPhone
contextRef="v_Participant_S000002837">&lt;p&gt;800-662-7447&lt;/p&gt;</rr:PerformanceAvailabilityPhone>
<rr:PerformanceAvailabilityWebSiteAddress
contextRef="v_Participant_S000002837">&lt;p&gt;vanguard.com/performance &lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
<rr:PerformancePastDoesNotIndicateFuture
contextRef="v_Participant_S000002837">&lt;p&gt;Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future.&lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
<rr:BarChartNarrativeTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table shows how the average annual total returns compare with those of a relevant market index and other comparative benchmarks, which have investment characteristics similar to those of the Fund. As of January 1, 2011, the Fund's performance benchmark was changed to a composite benchmark consisting of 70% Bank of America Merrill Lynch All US Convertibles Index and 30% Bank of America Merrill Lynch Global 300 Convertibles ex-US Index (hedged), because the Fund's board of trustees believes that the new composite benchmark is more consistent with the Fund's investment strategy. As of January 1, 2011, the Spliced Convertibles Composite Index consists of the returns of the CS First Boston Convertible Securities Index through November 30, 2004; the Bank of America Merrill Lynch All US Convertibles Index (formerly the Bank of America Merrill Lynch All Convertibles-All Qualities Index) through December 31, 2010; and a composite index consisting of 70% Bank of America Merrill Lynch All US Convertibles Index and 30% Bank of America Merrill Lynch Global 300 Convertibles ex-US Index (hedged) thereafter. Returns for the Convertible Securities Funds Average are derived from data provided by Lipper Inc. Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.&lt;/p&gt;</rr:BarChartNarrativeTextBlock>
<rr:ExpenseExampleHeading
contextRef="v_Retail_S000002837">&lt;p&gt;Example&lt;/p&gt;</rr:ExpenseExampleHeading>
<rr:ExpenseExampleNarrativeTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund's shares. This example assumes that the Fund provides a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</rr:ExpenseExampleNarrativeTextBlock>
<rr:ExpenseNarrativeTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund.&lt;/p&gt;</rr:ExpenseNarrativeTextBlock>
<rr:ObjectivePrimaryTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;The Fund seeks to provide current income and long-term capital appreciation.&lt;/p&gt;</rr:ObjectivePrimaryTextBlock>
<rr:PerformanceTableClosingTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.&lt;/p&gt;</rr:PerformanceTableClosingTextBlock>
<rr:PortfolioTurnoverHeading
contextRef="v_Retail_S000002837">&lt;p&gt;Portfolio Turnover&lt;/p&gt;</rr:PortfolioTurnoverHeading>
<rr:PortfolioTurnoverTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;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 previous expense example, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 103%. &lt;/p&gt;</rr:PortfolioTurnoverTextBlock>
<rr:RiskLoseMoney
contextRef="v_Retail_S000002837">&lt;p&gt;An investment in the Fund could lose money over short or even long periods. &lt;/p&gt;</rr:RiskLoseMoney>
<rr:RiskNarrativeTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;An investment in the Fund could lose money over short or even long periods. You should expect the Fund's share price and total return to fluctuate within a wide range, like the fluctuations of global stock markets. The Fund's performance could be hurt by:&lt;/p&gt;&lt;p&gt;Stock market risk, which is the chance that stock prices overall will decline. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. In addition, investments in foreign stocks can be riskier than U.S. stock investments. The prices of foreign stocks and the prices of U.S. stocks have, at times, moved in opposite directions. &lt;/p&gt;&lt;p&gt;Interest rate risk, which is the chance that prices of convertible securities will decline along with overall bond prices because of rising interest rates. Convertible securities are particularly sensitive to interest rate changes when their predetermined conversion price is much higher than the price of the issuing company's common stock.&lt;/p&gt;&lt;p&gt;Credit risk, which is the chance that the issuer of a convertible security will fail to pay interest or dividends and principal in a timely manner, or that negative perceptions of the issuer's ability to make such payments will cause the price of that security to decline. Companies that issue convertible securities are often small to medium size, and they often have low credit ratings. In addition, the credit rating of a company's convertible securities is generally lower than that of its non-convertible debt securities. Convertibles are normally considered 'junior' securities-that is, the company usually must pay interest on its non-convertible debt before it can make payments on its convertible securities. If an issuer stops making interest or principal payments, these securities may become worthless and the Fund could lose its entire investment. Reflecting the universe of convertible securities, most of the Fund's rated holdings are below investment-grade. Therefore, credit risk is greater for the Fund than for funds that invest in higher-grade securities.&lt;/p&gt;&lt;p&gt;Manager risk, which is the chance that poor security selection or focus on securities in a particular sector, category, or group of companies will cause the Fund to underperform relevant benchmarks or other funds with a similar investment objective.  &lt;/p&gt;&lt;p&gt;Liquidity risk, which is the chance that the Fund will experience market difficulty in buying or selling securities quickly enough to prevent or minimize a loss. Liquidity risk arises when there is an insufficient market for a particular security or class of securities.&lt;/p&gt;&lt;p&gt;Country/regional risk, which is the chance that world events-such as political upheaval, financial troubles, or natural disasters-will adversely affect the value of securities issued by companies in foreign countries or regions. Because the Fund may invest a large portion of its assets in securities of companies located in any one country or region,  the Fund's performance may be hurt disproportionately by the poor performance of its investments in that area.  &lt;/p&gt;&lt;p&gt;An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNarrativeTextBlock>
<rr:StrategyNarrativeTextBlock
contextRef="v_Retail_S000002837">&lt;p&gt;The Fund invests at least 80% of its assets in U.S. and foreign convertible securities, which are hybrid securities that combine the investment characteristics of bonds and common stocks. Convertible securities include corporate bonds and preferred stocks that are convertible into common stock, as well as debt securities with warrants or common stock attached. Many convertible securities have credit ratings that are below investment grade.&lt;/p&gt;</rr:StrategyNarrativeTextBlock >
<rr:RiskNotInsuredDepositoryInstitution
contextRef="v_Retail_S000002837">&lt;p&gt;An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.&lt;/p&gt;</rr:RiskNotInsuredDepositoryInstitution>
<rr:PerformanceInformationIllustratesVariabilityOfReturns
contextRef="v_Retail_S000002837">&lt;p&gt;The following bar chart and table are intended to help you understand the risks of investing in the Fund.&lt;/p&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
<rr:PerformanceAdditionalMarketIndex
contextRef="v_Retail_S000002837">&lt;p&gt;, which have investment characteristics similar to those of the Fund.&lt;/p&gt;</rr:PerformanceAdditionalMarketIndex>
<rr:PerformanceAvailabilityPhone
contextRef="v_Retail_S000002837">&lt;p&gt;800-662-7447&lt;/p&gt;</rr:PerformanceAvailabilityPhone>
<rr:PerformanceAvailabilityWebSiteAddress
contextRef="v_Retail_S000002837">&lt;p&gt;vanguard.com/performance &lt;/p&gt;</rr:PerformanceAvailabilityWebSiteAddress>
<rr:PerformancePastDoesNotIndicateFuture
contextRef="v_Retail_S000002837">&lt;p&gt;Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. &lt;/p&gt;</rr:PerformancePastDoesNotIndicateFuture>
<rr:PerformanceTableUsesHighestFederalRate
contextRef="v_Retail_S000002837">&lt;p&gt;When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption.&lt;/p&gt;</rr:PerformanceTableUsesHighestFederalRate>
<rr:PerformanceTableNotRelevantToTaxDeferred
contextRef="v_Retail_S000002837">&lt;p&gt;Please note that after-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan.&lt;/p&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
<rr:PerformanceTableExplanationAfterTaxHigher
contextRef="v_Retail_S000002837">&lt;p&gt;Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares will be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.&lt;/p&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
<rr:ShareholderFeesTableTextBlock
contextRef="v_Retail_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837ShareholderFeesRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:ShareholderFeesTableTextBlock>
<rr:ShareholderFeesTableTextBlock
contextRef="v_Participant_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837ShareholderFeesParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:ShareholderFeesTableTextBlock>
<rr:PerformanceTableTextBlock
contextRef="v_Participant_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837PerformanceTableDataParticipant column primary compact * row dei_LegalEntityAxis compact  vanguard_S000002837Member row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * ~ &lt;/div> </rr:PerformanceTableTextBlock>
<rr:PerformanceTableTextBlock
contextRef="v_Retail_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837PerformanceTableDataRetail column primary compact * row dei_LegalEntityAxis compact  vanguard_S000002837Member row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * ~ &lt;/div> </rr:PerformanceTableTextBlock>
<rr:AnnualFundOperatingExpensesTableTextBlock
contextRef="v_Retail_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837OperatingExpensesRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:AnnualFundOperatingExpensesTableTextBlock>
<rr:AnnualFundOperatingExpensesTableTextBlock
contextRef="v_Participant_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837OperatingExpensesParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:AnnualFundOperatingExpensesTableTextBlock>
<rr:ExpenseExampleNoRedemptionTableTextBlock
contextRef="v_Retail_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837ExpenseExampleNoRedemptionRetail column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:ExpenseExampleNoRedemptionTableTextBlock>
<rr:ExpenseExampleNoRedemptionTableTextBlock
contextRef="v_Participant_S000002837">&lt;div style="display:none">~ http://vanguard/role/S000002837ExpenseExampleNoRedemptionParticipant column period compact * column rr_ProspectusShareClassAxis compact * row primary compact * row dei_LegalEntityAxis compact vanguard_S000002837Member ~ &lt;/div> </rr:ExpenseExampleNoRedemptionTableTextBlock>
<rr:AnnualReturn2010
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.1924</rr:AnnualReturn2010>
<rr:AnnualReturn2009
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.4081</rr:AnnualReturn2009>
<rr:AnnualReturn2008
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">-0.2979</rr:AnnualReturn2008>
<rr:AnnualReturn2007
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.1061</rr:AnnualReturn2007>
<rr:AnnualReturn2006
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.1294</rr:AnnualReturn2006>
<rr:AnnualReturn2005
contextRef="v_S000002837_C000007767"
unitRef="pure"
decimals="4">0.0660</rr:AnnualReturn2005>
<rr:AnnualReturn2004
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.0720</rr:AnnualReturn2004>
<rr:AnnualReturn2003
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">0.3158</rr:AnnualReturn2003>
<rr:AnnualReturn2002
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">-0.0935</rr:AnnualReturn2002>
<rr:AnnualReturn2001
unitRef="pure"
decimals="4"
contextRef="v_S000002837_C000007767">-0.0309</rr:AnnualReturn2001>
<rr:AnnualReturnInceptionDate
contextRef="v_S000002837_C000007767">1986-06-17</rr:AnnualReturnInceptionDate>
<rr:BarChartHighestQuarterlyReturn
unitRef="pure"
contextRef="v_S000002837_C000007767"
decimals="4">0.1466</rr:BarChartHighestQuarterlyReturn>
<rr:BarChartLowestQuarterlyReturn
unitRef="pure"
contextRef="v_S000002837_C000007767"
decimals="4">-0.1590</rr:BarChartLowestQuarterlyReturn>
<rr:BarChartHighestQuarterlyReturnDate
contextRef="v_S000002837_C000007767">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
<rr:BarChartLowestQuarterlyReturnDate
contextRef="v_S000002837_C000007767">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
<rr:BarChartTableTextBlock
contextRef="v_Participant_S000002837">&lt;div style="display:none">~ http://xbrl.sec.gov/rr/role/BarChartData column rr_ProspectusShareClassAxis compact vanguard_C000007767Member ~ &lt;/div> </rr:BarChartTableTextBlock>
<rr:BarChartHeading
contextRef="v_Participant_S000002837">Annual Total Returns - Vanguard Convertible Securities Fund Investor Shares</rr:BarChartHeading>
<rr:BarChartClosingTextBlock
contextRef="v_Participant_S000002837">&lt;p>During the periods shown in the bar chart, the highest return for a calendar quarter was 14.66% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -15.90% (quarter ended December 31, 2008 ).&lt;/p></rr:BarChartClosingTextBlock>
<rr:HighestQuarterlyReturnLabel
contextRef="v_Participant_S000002837">(quarter ended September 30, 2009 )</rr:HighestQuarterlyReturnLabel>
<rr:LowestQuarterlyReturnLabel
contextRef="v_Participant_S000002837">(quarter ended December 31, 2008 )</rr:LowestQuarterlyReturnLabel>
<rr:BarChartTableTextBlock
contextRef="v_Retail_S000002837">&lt;div style="display:none">~ http://xbrl.sec.gov/rr/role/BarChartData column rr_ProspectusShareClassAxis compact vanguard_C000007767Member ~ &lt;/div> </rr:BarChartTableTextBlock>
<rr:BarChartHeading
contextRef="v_Retail_S000002837">Annual Total Returns - Vanguard Convertible Securities Fund Investor Shares</rr:BarChartHeading>
<rr:BarChartClosingTextBlock
contextRef="v_Retail_S000002837">&lt;p>During the periods shown in the bar chart, the highest return for a calendar quarter was 14.66% (quarter ended September 30, 2009 ), and the lowest return for a quarter was -15.90% (quarter ended December 31, 2008 ).&lt;/p></rr:BarChartClosingTextBlock>
<rr:HighestQuarterlyReturnLabel
contextRef="v_Retail_S000002837">(quarter ended September 30, 2009 )</rr:HighestQuarterlyReturnLabel>
<rr:LowestQuarterlyReturnLabel
contextRef="v_Retail_S000002837">(quarter ended December 31, 2008 )</rr:LowestQuarterlyReturnLabel>
<rr:AverageAnnualReturnInceptionDate
contextRef="v_S000002837_C000007767">1986-06-17</rr:AverageAnnualReturnInceptionDate>
<rr:AverageAnnualReturnYear01
unitRef="pure"
contextRef="v_S000002837_C000007767"
decimals="4">0.1924</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
decimals="4"
contextRef="v_S000002837_C000007767"
unitRef="pure">0.0805</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
decimals="4"
contextRef="v_S000002837_C000007767"
unitRef="pure">0.0688</rr:AverageAnnualReturnYear10>
<vanguard:ComparativeBenchmark
contextRef="v_S000002837_C000007767">Comparative Benchmarks</vanguard:ComparativeBenchmark>
<rr:AverageAnnualReturnYear01
decimals="4"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsMember"
unitRef="pure">0.1558</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
unitRef="pure"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsMember"
decimals="4">0.0569</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
decimals="4"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsMember"
unitRef="pure">0.0490</rr:AverageAnnualReturnYear10>
<rr:AverageAnnualReturnYear01
unitRef="pure"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsAndSalesMember"
decimals="4">0.1315</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
unitRef="pure"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsAndSalesMember"
decimals="4">0.0567</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
decimals="4"
contextRef="v_S000002837_C000007767_AfterTaxesOnDistributionsAndSalesMember"
unitRef="pure">0.0484</rr:AverageAnnualReturnYear10>
<rr:MaximumCumulativeSalesChargeOverOther
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">0.0000</rr:MaximumCumulativeSalesChargeOverOther>
<vanguard:RedemptionFeeParenthetical
contextRef="v_Retail_S000002837">(on shares held less than one year)</vanguard:RedemptionFeeParenthetical>
<vanguard:RedemptionFeeParenthetical
contextRef="v_Participant_S000002837">(on shares held less than one year)</vanguard:RedemptionFeeParenthetical>
<rr:RedemptionFeeOverRedemption
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">-0.0100</rr:RedemptionFeeOverRedemption>
<rr:MaximumAccountFee
contextRef="v_S000002837_C000007767"
unitRef ="usd"
decimals="4">20.</rr:MaximumAccountFee>
<rr:MaximumCumulativeSalesChargeOverOfferingPrice
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
<rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther
contextRef="v_S000002837_C000007767"
unitRef ="pure"
decimals="4">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
<rr:ExpenseExampleNoRedemptionYear01
contextRef="v_S000002837_C000007767"
unitRef ="usd"
decimals="4">69.</rr:ExpenseExampleNoRedemptionYear01>
<rr:ExpenseExampleNoRedemptionYear03
decimals="4"
unitRef ="usd"
contextRef="v_S000002837_C000007767">218.</rr:ExpenseExampleNoRedemptionYear03>
<rr:ExpenseExampleNoRedemptionYear05
decimals="4"
unitRef ="usd"
contextRef="v_S000002837_C000007767">379.</rr:ExpenseExampleNoRedemptionYear05>
<rr:ExpenseExampleNoRedemptionYear10
contextRef="v_S000002837_C000007767"
unitRef ="usd"
decimals="4">847.</rr:ExpenseExampleNoRedemptionYear10>
<rr:ManagementFeesOverAssets
contextRef="v_S000002837_C000007767"
unitRef ="pure"
decimals="4">0.0065</rr:ManagementFeesOverAssets>
<rr:DistributionAndService12b1FeesOverAssets
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">0</rr:DistributionAndService12b1FeesOverAssets>
<rr:OtherExpensesOverAssets
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">0.0003</rr:OtherExpensesOverAssets>
<rr:NetExpensesOverAssets
decimals="4"
unitRef ="pure"
contextRef="v_S000002837_C000007767">0.0068</rr:NetExpensesOverAssets>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Participant_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">(reflects no deduction for taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Retail_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">(reflects no deduction for taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:AverageAnnualReturnYear01
decimals="4"
unitRef="pure"
contextRef="v_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">0.1685</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
contextRef="v_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember"
unitRef="pure"
decimals="4">0.0555</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
contextRef="v_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember"
unitRef="pure"
decimals="4">0.0438</rr:AverageAnnualReturnYear10>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Participant_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Retail_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:AverageAnnualReturnYear01
decimals="4"
unitRef="pure"
contextRef="v_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">0.1677</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
contextRef="v_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember"
unitRef="pure"
decimals="4">0.0571</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
contextRef="v_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember"
unitRef="pure"
decimals="4">0.0497</rr:AverageAnnualReturnYear10>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Participant_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:IndexNoDeductionForFeesExpensesTaxes
contextRef="v_Retail_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">(reflects no deduction for fees, expenses, or taxes)</rr:IndexNoDeductionForFeesExpensesTaxes>
<rr:AverageAnnualReturnYear01
decimals="4"
unitRef="pure"
contextRef="v_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">0.1677</rr:AverageAnnualReturnYear01>
<rr:AverageAnnualReturnYear05
contextRef="v_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember"
unitRef="pure"
decimals="4">0.0571</rr:AverageAnnualReturnYear05>
<rr:AverageAnnualReturnYear10
contextRef="v_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember"
unitRef="pure"
decimals="4">0.0473</rr:AverageAnnualReturnYear10>
<xbrli:context
id="v">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Participant_S000002837">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:ParticipantMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Retail_S000002837">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:RetailMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767_AfterTaxesOnDistributionsMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">rr:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767_AfterTaxesOnDistributionsAndSalesMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">rr:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:ConvertibleSecuritiesFundsAverageMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:BankofAmericaMerrillLynchAllUSConvertiblesMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:SplicedConvertiblesCompositeIndexMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Participant_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:BankofAmericaMerrillLynchAllUSConvertiblesMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:ParticipantMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Retail_S000002837_C000007767_BankofAmericaMerrillLynchAllUSConvertiblesMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:BankofAmericaMerrillLynchAllUSConvertiblesMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:RetailMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Participant_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:ConvertibleSecuritiesFundsAverageMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:ParticipantMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Retail_S000002837_C000007767_ConvertibleSecuritiesFundsAverageMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:ConvertibleSecuritiesFundsAverageMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:RetailMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Participant_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:SplicedConvertiblesCompositeIndexMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:ParticipantMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:context
id="v_Retail_S000002837_C000007767_SplicedConvertiblesCompositeIndexMember">
<xbrli:entity>
<xbrli:identifier
scheme="http://www.sec.gov/CIK">0000791107</xbrli:identifier>
<xbrli:segment>
<xbrldi:explicitMember
dimension="dei:LegalEntityAxis">vanguard:S000002837Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:PerformanceMeasureAxis">vanguard:SplicedConvertiblesCompositeIndexMember</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="rr:ProspectusShareClassAxis">vanguard:C000007767Member</xbrldi:explicitMember>
<xbrldi:explicitMember
dimension="dei:DocumentInformationDocumentAxis">vanguard:RetailMember</xbrldi:explicitMember></xbrli:segment></xbrli:entity>
<xbrli:period>
<xbrli:startDate>2009-12-01</xbrli:startDate>
<xbrli:endDate>2010-11-30</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:unit
id="usd">
<xbrli:measure>iso4217:USD</xbrli:measure></xbrli:unit>
<xbrli:unit
id="pure">
<xbrli:measure>xbrli:pure</xbrli:measure></xbrli:unit>
<dei:DocumentCreationDate
contextRef="v">2011-04-01</dei:DocumentCreationDate>
<dei:DocumentEffectiveDate
contextRef="v">2011-03-23</dei:DocumentEffectiveDate>
<dei:DocumentPeriodEndDate
contextRef="v">2010-11-30</dei:DocumentPeriodEndDate>
<dei:DocumentType
contextRef="v">485BPOS</dei:DocumentType>
<dei:EntityRegistrantName
contextRef="v">Vanguard Convertible Securities Fund </dei:EntityRegistrantName>
<dei:EntityCentralIndexKey
contextRef="v">0000791107</dei:EntityCentralIndexKey>
<dei:AmendmentFlag
contextRef="v">false</dei:AmendmentFlag>
<rr:RiskReturnDetailTableTextBlock
contextRef="v">&lt;div style="display: none">~ http://xbrl.sec.gov/rr/role/RiskReturnDetailData column period compact * row dei_DocumentInformationDocumentAxis compact * row dei_LegalEntityAxis compact * row rr_ProspectusShareClassAxis compact * row rr_PerformanceMeasureAxis compact * row primary compact * ~ &lt;/div></rr:RiskReturnDetailTableTextBlock></xbrli:xbrl>