VANGUARD ASSET ALLOCATION FUND INC
497, 1998-01-22
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                                                 A Member of The Vanguard Group
===============================================================================

PROSPECTUS -- January 16, 1998
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NEW ACCOUNT INFORMATION: Investor Information Department -- 1-800-662-7447
(SHIP)
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SHAREHOLDER ACCOUNT SERVICES: Client Services Department -- 1-800-662-2739
(CREW)
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INVESTMENT         Vanguard Asset Allocation Fund, Inc. (the "Fund") is an     
OBJECTIVE &        open-end diversified investment company that seeks to       
POLICIES           maximize total return (i.e., capital change plus income).   
                   The Fund invests in common stocks, bonds and money market   
                   instruments in proportions consistent with their expected   
                   returns and risks as evaluated by the Fund's adviser. The   
                   Fund should not be considered a complete investment program.
                   There is no assurance that the Fund will achieve its stated 
                   objective. Shares of the Fund are neither insured nor       
                   guaranteed by any agency of the U.S. Government, including  
                   the FDIC.                                                   
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OPENING AN         To open a regular (non-retirement) account, please complete  
ACCOUNT            and return the Account Registration Form. If you need        
                   assistance in completing this form, please call our Investor 
                   Information Department. To open an Individual Retirement     
                   Account (IRA), please use a Vanguard IRA Adoption Agreement. 
                   To obtain a copy of this form, call 1-800-662-7447, Monday   
                   through Friday from 8:00 a.m. to 9:00 p.m. and Saturday, from
                   9:00 a.m. to 4:00 p.m. (Eastern time). The minimum initial   
                   investment is $3,000, or $1,000 for Uniform Gifts/Transfers  
                   to Minors Act accounts. The Fund is offered on a no-load     
                   basis (i.e., there are no sales commissions or 12b-1 fees).  
                   However, the Fund incurs expenses for investment advisory,   
                   management, administrative and distribution services.        
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ABOUT THIS         This Prospectus is designed to set forth concisely the       
PROSPECTUS         information you should know about the Fund before you invest.
                   It should be retained for future reference. A "Statement of  
                   Additional Information" containing additional information    
                   about the Fund has been filed with the Securities and        
                   Exchange Commission. Such Statement is dated January 16, 1998
                   and has been incorporated by reference into this Prospectus. 
                   A copy may be obtained without charge by writing to the Fund,
                   by calling our Investor Information Department at            
                   1-800-662-7447 or by visiting the Securities and Exchange    
                   Commission's website (www.sec.gov).                          

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TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                 Page                                       Page                                      Page 
<S>                                 <C>                                        <C>                                    <C>
Fund Expenses   ...............     2      Implementation of Policies  ...     6                SHAREHOLDER GUIDE          
Financial Highlights  .........     2      Investment Limitations   ......     8     Opening an Account and                
Yield and Total Return   ......     3      Management of the Fund   ......     9        Purchasing Shares  .........    15 
             FUND INFORMATION              Investment Adviser ............     9     When Your Account Will Be             
Investment Objective  .........     3      Performance Record ............    11        Credited  ..................    18 
Investment Policies   .........     3      Dividends, Capital Gains and              Selling Your Shares   .........    19 
Investment Risks   ............     4         Taxes  .....................    12     Exchanging Your Shares   ......    21 
Who Should Invest  ............     6      The Share Price of the Fund ...    13     Important Information About           
                                           General Information   .........    14        Telephone Transactions   ...    23 
                                                                                     Transferring Registration   ...    23 
                                                                                     Other Vanguard Services  ......    24 
                                                                                                                       
</TABLE>

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THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION, NOR HAS THE SECURITIES AND EXCHANGE COMMISSION  PASSED UPON
THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.
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<PAGE>


FUND EXPENSES    The following table illustrates all expenses and fees that you
                 would incur as a shareholder of the Fund. The expenses and fees
                 set forth in the table are for the 1997 fiscal year.

                      Shareholder Transaction Expenses
                -----------------------------------------------------------
                 Sales Load Imposed on Purchases ..................   None
                 Sales Load Imposed on Reinvested Dividends  ......   None
                 Redemption Fees  .................................   None
                 Exchange Fees ....................................   None

<TABLE>
<CAPTION>
                              Annual Fund Operating Expenses
                 --------------------------------------------------------------------
<S>                                                             <C>             <C>
                 Management & Administrative Expenses  ......                   0.36%
                 Investment Advisory Fees  ..................                   0.09
                 12b-1 Fees .................................       None
                 Other Expenses
                 Distribution Costs  ........................       0.02%
                 Miscellaneous Expenses .....................       0.02 
                                                                   -----
                 Total Other Expenses   .....................                   0.04 
                                                                                ----
                     Total Operating Expenses ...............                   0.49%
                                                                                ====
</TABLE>


                 The purpose of this table is to assist you in understanding the
                 various costs and expenses that you would bear directly or
                 indirectly as an investor in the Fund.

                 The following example illustrates the expenses that you would
                 incur on a $1,000 investment over various periods, assuming (1)
                 a 5% annual rate of return and (2) redemption at the end of
                 each period. As noted in the table above, the Fund charges no
                 redemption fees of any kind.

                       1 Year               3 Years     5 Years     10 Years
                       -------             ---------   ---------   ---------
                         $5                   $16         $27         $62


                 This example should not be considered a representation of past
                 or future expenses or performance. Actual expenses may be
                 higher or lower than those shown.
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FINANCIAL        The following financial highlights information, for a share    
HIGHLIGHTS       outstanding throughout each period, insofar as it relates to  
                 each of the five years in the period ended September 30, 1997, 
                 has been derived from the financial statements which were      
                 audited by Price Waterhouse LLP, independent accountants, whose
                 report thereon was unqualified. This information should be read
                 in conjunction with the financial statements and notes thereto,
                 which, together with the remaining portions of the Fund's 1997 
                 Annual Report to Shareholders, are incorporated by reference in
                 the Statement of Additional Information and this Prospectus,   
                 and which appear, along with the report of Price Waterhouse    
                 LLP, in the Fund's 1997 Annual Report to Shareholders. For a   
                 more complete discussion of the Fund's performance, please see 
                 the Fund's 1997 Annual Report to Shareholders, which may be    
                 obtained without charge by writing to the Fund or by calling   
                 our Investor Information Department at 1-800-662-7447.         

2
<PAGE>

<TABLE>
<CAPTION>
                                                 Year Ended September 30,
                                   -------------------------------------------------
                                       1997        1996         1995          1994
                                   -----------  -----------  -----------  ----------
<S>                                <C>          <C>          <C>          <C>
Net Asset Value, Beginning of
 Period  ........................   $18.27       $17.03        $13.78         $15.08
                                    -------      -------     --------      ---------
Investment Operations
 Net Investment Income  .........      .74          .69           .64            .52
 Net Realized and Unrealized
  Gain (Loss) on Investments.....     4.29         1.82          3.18           (.81)
                                    -------      -------     --------      ---------
  Total from Investment
  Operations   ..................     5.03         2.51          3.82           (.29)
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Distributions
 Dividends from Net Investment
  Income ........................     (.72)      (  .66)         (.57)          (.48)
 Distributions from Realized
  Capital Gains   ...............    (1.05)      (  .61)           --           (.53)
                                    --------     --------    --------      ---------
  Total Distributions   .........    (1.77)      ( 1.27)         (.57)         (1.01)
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Net Asset Value, End of
 Period  ........................   $21.53       $18.27        $17.03         $13.78
====================================================================================
Total Return   ..................    29.42%       15.27%        28.57%         (2.05)%
====================================================================================
Ratios/Supplemental Data
Net Assets, End of Period
 (Millions) .....................   $3,738       $2,341       $1,593          $1,120
Ratio of Total Expenses to
 Average Net Assets  ............     0.49%        0.47%        0.49%           0.50%
Ratio of Net Investment Income
 to Average Net Assets  .........     3.96%        4.17%        4.41%           3.68%
Portfolio Turnover Rate .........       10%          47%          34%             51%
Average Commission Rate Paid  ...   $.0099       $.0160          N/A             N/A


                                                                                         Nov. 3, 1988+ to
                                      1993         1992         1991          1990        Sept. 30, 1989
                                   -----------  -----------  -----------  -------------  ------------------
Net Asset Value, Beginning of
 Period  ........................  $  13.79     $  13.06     $  10.93      $   12.11       $  10.00
                                   --------     --------     --------      ---------       --------
Investment Operations
 Net Investment Income  .........       .54          .61          .60            .60           .46
 Net Realized and Unrealized
  Gain (Loss) on Investments ....      1.51          .90         2.28          (1.12)         1.90
                                   --------     --------     --------      ---------       --------
  Total from Investment
  Operations   ..................      2.05         1.51         2.88           (.52)         2.36
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Distributions
 Dividends from Net Investment
  Income ........................      (.59)        (.59)        (.62)          (.51)         (.25)
 Distributions from Realized
  Capital Gains   ...............      (.17)        (.19)        (.13)          (.15)           --
                                   --------     --------     --------      ---------       --------
  Total Distributions   .........      (.76)        (.78)        (.75)          (.66)         (.25)
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Net Asset Value, End of
 Period  ........................  $  15.08     $  13.79     $  13.06      $   10.93       $  12.11
===========================================================================================================
Total Return   ..................     15.41%       12.16%       27.32%         (4.57)%        23.93%
===========================================================================================================
Ratios/Supplemental Data
Net Assets, End of Period
 (Millions) .....................  $  1,003     $    502     $    265      $     160       $    107
Ratio of Total Expenses to
 Average Net Assets  ............      0.49%        0.52%        0.44%          0.50%          0.49%*
Ratio of Net Investment Income
 to Average Net Assets  .........      4.07%        4.95%        5.28%          5.53%         5.53%*
Portfolio Turnover Rate .........        31%          18%          44%            12%           52%
Average Commission Rate Paid  ...      N/A          N/A          N/A          N/A               N/A
</TABLE>

* Annualized.
+Commencement of operations.

<PAGE>
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YIELD AND TOTAL  From time to time the Fund may advertise its yield and total   
RETURN           return. Both yield and total return figures are based on       
                 historical earnings and are not intended to indicate future    
                 performance. The "total return" of the Fund refers to the      
                 average annual compounded rates of return over one-, five- and 
                 ten-year periods or for the life of the Fund (which periods    
                 will be stated in the advertisement) that would equate an      
                 initial amount invested at the beginning of a stated period to 
                 the ending redeemable value of the investment, assuming the    
                 reinvestment of all dividend and capital gains distributions.
     
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INVESTMENT       The objective of the Fund is to maximize total return (i.e., 
OBJECTIVE        capital change plus income) while exhibiting less investment 
The Fund seeks   risk than a portfolio consisting entirely of common stocks.  
to maximize      There is no assurance that the Fund will achieve its stated  
total return     objective.                                                   
                 
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INVESTMENT       The Fund will allocate its assets among a common stock         
POLICIES         portfolio, a bond portfolio, and money market instruments. The
                 Fund's adviser, Mellon Capital Management, allocates the Fund's
The Fund         assets among stocks, bonds and money market instruments in     
invests in       proportions which reflect the anticipated returns and risks of 
stocks, bonds    each asset class. The estimates of return and risk are         
and money        developed based upon the adviser's disciplined valuation       
market           methodology. There are no limitations on the amount of         
instruments  
in           
varying      
proportions  

                                                                             3
<PAGE>

                 the Fund's assets which may be allocated to each of the three
                 asset classes (stocks, bonds and money market instruments). The
                 Fund is managed without regard to tax ramifications.

                 In estimating the relative attractiveness of each asset class,
                 the adviser takes into account various factors. Common stocks
                 are evaluated using a "dividend-discount" model. This model
                 provides an estimate of the expected return of the Standard &
                 Poor's 500 Composite Stock Price Index (the "S&P 500 Index")
                 based upon earnings forecasts for companies whose stocks are
                 included in the S&P 500 Index. The expected bond return is the
                 current yield-to-maturity of long-term U.S. Treasury bonds,
                 while the return on money market instruments reflects the
                 current yield on three-month U.S. Treasury bills and long-term
                 inflation forecasts.

                 Once expected return and volatility (risk) estimates are
                 developed for each asset class, the adviser attempts to
                 identify apparent imbalances in the relative pricing of common
                 stocks, bonds and money market instruments, using a computer
                 model. Implicit in the adviser's approach is the belief that
                 such short-term imbalances occur periodically but tend to be
                 corrected fairly quickly. The Fund's allocation among the three
                 asset classes is then structured to take advantage of these
                 perceived imbalances.

                 To implement a particular allocation strategy, the Fund may
                 invest in the following securities: a diversified portfolio of
                 common stocks selected by the adviser to parallel the
                 performance of the S&P 500 Index; long-term U.S. Treasury bonds
                 with maturities generally in excess of 20 years; and selected
                 money market instruments, including repurchase agreements. The
                 Fund may also invest in futures contracts on stock indexes and
                 bonds. See "Implementation of Policies" for a description of
                 the securities in which the Fund invests and other investment
                 practices of the Fund.

                 The Fund is responsible for voting the shares of all securities
                 it holds.

                 The investment objective and policies of the Fund are not
                 fundamental and so may be changed by the Board of Directors
                 without shareholder approval. However, shareholders would be
                 notified prior to a material change in either.
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INVESTMENT RISKS Depending on the adviser's allocation of the Fund's assets     
                 among stocks, bonds and cash reserves, investors in the Fund   
The Fund is      may be exposed to the market risk of common stocks and bonds.  
subject to stock                                                 
and bond         Stock market risk is the possibility that stock prices in      
market risk      general will decline over short or even extended periods. The  
                 stock market tends to be cyclical, with periods when stock     
                 prices generally rise and periods when stock prices generally  
                 decline. To illustrate the volatility of domestic stock prices,
                 the table on page 5 sets forth the extremes for U.S. stock     
                 market returns as well as the average return for the period    
                 from 1926 to 1997, as measured by the Standard & Poor's 500    
                 Composite Stock Price Index:                                   
     
4
<PAGE>

             Average Annual U.S. Stock Market Returns (1926-1997)
                          Over Various Time Horizons
<TABLE>
<CAPTION>

    
                                1 Year          5 Years          10 Years         20 Years
                             --------------   --------------   ---------------   -----------
<S>                          <C>              <C>              <C>               <C>
                 Best             +53.9%           +23.9%           +20.1%          +16.9%
                 Worst            -43.3            -12.5             -0.9            +3.1
                 Average          +13.0            +10.5            +10.9           +10.9
</TABLE>
                 As shown, from 1926 to 1997, U.S. common stocks as measured by
                 the Index provided an average annual total return (capital
                 appreciation plus dividend income) for 10 years, of +10.9%.
                 Average return may not be useful for forecasting future returns
                 in any particular period, as stock returns are quite volatile
                 from year to year.
     
                 Bond market risk is the potential for fluctuations in the
                 market value of bonds. Bond prices vary inversely with changes
                 in the level of interest rates. When interest rates rise, the
                 prices of bonds fall; conversely, when interest rates fall,
                 bond prices rise. While bonds normally fluctuate less in price
                 than stocks, there have been extended periods of cyclical
                 increases in interest rates that have caused significant
                 declines in bond prices. For example, long-term bond prices
                 fell 48% from December 1976 to September 1981. The risk of
                 bonds declining in value, however, may be offset in whole or in
                 part by the higher level of income that bonds provide.

                 While the Fund invests in stocks, bonds and money market
                 instruments in varying proportions, investors should not
                 construe the Fund as a balanced investment program offering
                 relatively stable allocations among these asset classes.
                 Because the allocation strategy of the adviser may, at certain
                 times, result in a portfolio with a primary emphasis on common
                 stocks, the Fund may from time to time exhibit a level of
                 volatility which is more consistent with a common stock
                 portfolio than a balanced portfolio. However, under normal
                 circumstances, the volatility of the Fund's total return is
                 expected to be less than that of a common stock portfolio, as
                 represented, for example, by the S&P 500 Index.


The adviser may  Investors should also be aware that the investment results of  
fail to          the Fund depend upon the adviser's ability to anticipate       
anticipate       correctly the relative performance and risk of stocks, bonds   
market           and money market instruments. Historical evidence indicates    
advances or      that correctly timing portfolio allocations among these asset  
declines         classes has been an extremely difficult strategy to implement  
                 successfully. While the adviser has substantial experience in  
                 asset allocation, there can be no assurance that the adviser   
                 will correctly anticipate relative asset class performance in  
                 the future on a consistent basis. The Fund's short-term        
                 investment results would suffer, for example, if only a small  
                 portion of the Fund's assets were allocated to stocks during a 
                 significant stock market advance, or if a major portion of its 
                 assets were allocated to stocks during a market decline.       
                 Similarly, the Fund's short-term investment results would also 
                 suffer if the Fund were substantially invested in bonds at a   
                 time when interest rates increased.                            

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                                                                              5
<PAGE>

WHO SHOULD       The Fund is designed for investors seeking maximum total return
INVEST           through an investment vehicle which provides an actively       
                 managed mix of stocks, bonds and money market instruments.     
Long-term        Because the Fund can and may have a large percentage of its   
investors        portfolio invested in common stocks, investors in the Fund     
seeking          should be willing to accept the risk of an all-stock portfolio,
maximum total    including the potential for sudden, sometimes substantial      
return           declines in market value.                                      
                 
                 Due to the risks associated with common stock and bond
                 investments, the Fund is intended to be a long-term investment
                 vehicle and is not designed to provide investors with a means
                 of speculating on short-term stock and bond market movements.
                 Investors who engage in excessive account activity generate
                 additional costs which are borne by all of the Fund's
                 shareholders. In order to minimize such costs the Fund has
                 adopted the following policies. The Fund reserves the right to
                 reject any purchase request (including exchange purchases from
                 other Vanguard portfolios) that is reasonably deemed to be
                 disruptive to efficient portfolio management, either because of
                 the timing of the investment or previous excessive trading by
                 the investor. Additionally, the Fund has adopted exchange
                 privilege limitations as described in the section "Exchange
                 Privilege Limitations." Finally, the Fund reserves the right to
                 suspend the offering of its shares.

                 No assurance can be given that the Fund will achieve its
                 objective or that shareholders will be protected from the risk
                 of loss that is inherent in equity investing. Also, there can
                 be no guarantee that the adviser will correctly anticipate
                 fluctuations in the stock and bond markets in its effort to
                 maximize total return while minimizing risk.

                 The Fund should be considered part of a well-rounded investment
                 program and not its sole component. Investors may wish to
                 reduce the potential risk of investing in the Fund by
                 purchasing shares on a regular, periodic basis (dollar-cost
                 averaging) rather than making an investment in one lump sum.
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IMPLEMENTATION   In an effort to maximize its total investment return, the Fund 
OF POLICIES      utilizes a number of investment practices.

                          
The Fund may     The Fund invests in stocks, bonds and money market instruments
invest in        in varying proportions. For common stocks, the Fund will invest
stocks, bonds    in a diversified portfolio of common stocks selected to        
and money        parallel theinvestment performance of the S&P 500 Index. The   
market           Fund may also invest in stock index futures and options to a
instruments      limited extent, as described on page 7.             
                      
                 Bond investments for the Fund will consist of long-term U.S.
                 Treasury bonds (those with maturities generally in excess of 20
                 years) and, as described below, futures contracts and options
                 on such bonds. As part of its bond portfolio, the Fund may also
                 invest in other long-term "full faith and credit" obligations
                 of the U.S. Government.

6
<PAGE>
                 The money market instruments held by the Fund will have an
                 average weighted maturity of less than 90 days. Money market
                 instruments may include obligations of the United States
                 Government and its agencies and instrumentalities; commercial
                 paper, bank certificates of deposit, and bankers' acceptances;
                 and repurchase agreements collateralized by these securities.

                 The Fund, along with other Vanguard Funds, may deposit its
                 daily cash reserves into a joint account which invests such
                 reserves in repurchase agreements and other short-term
                 instruments. CoreStates Bank, NA is the custodian for the joint
                 account.

                 A repurchase agreement is a means of investing monies for a
                 short period. In a repurchase agreement, a seller -- a U.S.
                 commercial bank or recognized U.S. securities dealer -- sells
                 securities to the Fund and agrees to repurchase the securities
                 at the Fund's cost plus interest within a specified period
                 (normally one day). In these transactions, the securities
                 acquired by the Fund will have a total value equal to, or in
                 excess of, the value of the repurchase agreement, and will be
                 held by the custodian bank for the joint account until
                 repurchased.

The Fund may     The Fund may lend its investment securities to qualified       
lend its         institutional investors for either short-term or long-term     
securities       purposes of realizing additional income. Loans of securities by
                 the Fund will be collateralized by cash, letters of credit, or 
                 securities issued or guaranteed by the U.S. Government or its  
                 agencies. The collateral will equal at least 100% of the       
                 current market value of the loaned securities.                 

The Fund may     The Fund may borrow money, subject to the limitations set forth
borrow money     below, for temporary or emergency purposes, including the     
under unusual    meeting of redemption requests which might otherwise require   
circumstances    selling securities at a loss.                                  
                 
Portfolio        Due to the active asset allocation approach employed by the   
turnover         Fund, the Fund's portfolio turnover rate may be high,         
may be high      approximately 100% per year. A 100% portfolio turnover rate   
                 would occur, for example, if all of the Fund's securities were
                 replaced within one year.                                     
                 
Derivative       Derivatives are instruments whose values are linked to or      
Investing        derived from an underlying security or index. The most common  
                 and conventional types of derivative securities are futures and
                 options.                                                       
                 
The Fund may     The Fund may utilize stock and bond futures contracts and      
use futures      options to a limited extent. Specifically, the Fund may enter  
contracts and    into futures contracts provided that not more than 5% of its   
options          gross assets are required as a futures contract deposit; in    
                 addition, the Fund may enter into futures contracts and options
                 only to the extent that obligations under such contracts or    
                 transactions represent not more than 50% of the Fund's gross   
                 assets. However, under unusual circumstances, the Fund may     
                 maintain futures positions that are equivalent in value to up  
                 to 100% of the Fund's gross assets, so that the Fund may remain
                 effectively fully invested in proportions consistent with the  
                 adviser's current asset allocation strategy.                   

                                                                             7
<PAGE>

                 Futures contracts and options may be used for several reasons:
                 to reallocate the Fund's assets among stocks, bonds and money
                 market instruments while minimizing transaction costs; to
                 maintain cash reserves while simulating full investment; to
                 facilitate trading; or to seek higher investment returns when a
                 futures contract is priced more attractively than the
                 underlying security or index.

                 For example, in order to reallocate 10% of the Fund's assets
                 from stocks to bonds while minimizing transaction costs, the
                 adviser may sell stock index futures and purchase bond futures.
                 Because the transaction costs of futures contracts and options
                 may be lower than the costs of investing in stocks or bonds
                 directly, it is expected that the use of futures contracts and
                 options may reduce the Fund's total transaction costs. Also,
                 because futures contracts only require a small initial margin
                 deposit, the Fund would then be able to simultaneously maintain
                 a cash reserve for potential redemptions and simulate full
                 investment. In the event of net redemptions from the Fund,
                 sufficient futures contracts would be sold to avoid any
                 leveraging of the Fund's assets.

Futures          The primary risks associated with the use of futures contracts 
contracts and    and options are: (i) imperfect correlation between the change  
options pose     in market value of the securities held by the Fund and the     
certain risks    prices of futures contracts and options; and (ii) possible lack
                 of a liquid secondary market for a futures contract and the    
                 resulting inability to close a futures position prior to its   
                 maturity date. The risk of imperfect correlation will be       
                 minimized by investing only in those contracts whose behavior  
                 is expected to resemble that of the Fund's underlying          
                 securities. The risk that the Fund will be unable to close out 
                 a futures position will be minimized by entering into such     
                 transactions on a national exchange with an active and liquid  
                 secondary market. While futures contracts and options can be   
                 used as leveraged instruments, the Fund may not use futures    
                 contracts or options to leverage its net assets.               

                 The risk of loss in trading futures contracts in some
                 strategies can be substantial, due both to the low margin
                 deposits required and the extremely high degree of leverage
                 involved in futures pricing. As a result, a relatively small
                 price movement in a futures contract may result in immediate
                 and substantial loss (or gain) to the investor. When investing
                 in futures contracts, the Fund will segregate cash or other
                 liquid portfolio securities in the amount of the underlying
                 obligation.
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INVESTMENT       The Fund has adopted fundamental limitations on some of its    
LIMITATIONS      investment policies. Some of these limitations are that the    
                 Fund may not:                                                  

The Fund has     (a) with respect to 75% of the value of its total assets,  
adopted certain  purchase the securities of any issuer (except obligations of   
fundamental      the United States government and its instrumentalities) if as 
limitations      a result the Fund would hold more than 10% of the outstanding  
                 voting securities of the issuer, or more than 5% of the value 
                 of the Fund's total assets would be invested in the securities 
                 of such issuer;                                                
                                                                                
                 (b) invest more than 25% of its assets in any one industry;    
                                                                                
                 (c) borrow money except from banks (or through reverse         
                 repurchase agreements) for temporary or emergency purposes (not
                 leveraging), and then only in                                  

8
<PAGE>

                 an amount not in excess of 15% of the value of the Fund's net
                 assets at the time the borrowing is made. Whenever borrowing
                 exceeds 5% of the value of the Fund's assets, the Fund will not
                 make any additional investments; and

                 (d) pledge, mortgage or hypothecate any of its assets to an
                 extent greater than 5% of its total assets.

                 A complete list of applicable investment limitations can be
                 found in the Statement of Additional Information; these are
                 fundamental and may be changed only by approval of a majority
                 of the Fund's shareholders.

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MANAGEMENT OF    The Fund is a member of The Vanguard Group of Investment       
THE FUND         Companies, a family of more than 30 investment companies with  
                 more than 95 distinct investment portfolios and total assets in
Vanguard         excess of $310 billion. Through their jointly-owned subsidiary,
administers and  The Vanguard Group, Inc. ("Vanguard"), the Fund and the other  
distributes the  funds in the Group obtain at cost virtually all of their       
Fund             corporate management, administrative and distribution         
                 services. Vanguard also provides investment advisory services  
                 on an at-cost basis to certain Vanguard funds. As a result of  
                 Vanguard's unique corporate structure, the Vanguard funds have 
                 costs substantially lower than those of most competing mutual  
                 funds. In 1996, the average expense ratio (annual costs        
                 including advisory fees divided by average net assets) for the 
                 Vanguard funds amounted to approximately .29% compared to an   
                 average of 1.22% for the mutual fund industry (data provided by
                 Lipper Analytical Services).                                   

                 Vanguard employs a supporting staff of management and
                 administrative personnel needed to provide the requisite
                 services to the funds and also furnishes the funds with
                 necessary office space, furnishings and equipment. Each fund
                 pays a share of Vanguard's total expenses, which are allocated
                 among the funds under methods approved by the Board of
                 Directors (Trustees) of each fund. In addition, each fund bears
                 its own direct expenses, such as legal, auditing and custodian
                 fees.

                 The Officers of the Fund manage its day-to-day operations and
                 are responsible to the Fund's Board of Directors. The Directors
                 set broad policies for the Fund and choose its Officers. A list
                 of  of the Fund and a statement of their
                 present positions and principal occupations during the past
                 five years can be found in the Statement of Additional
                 Information.

                 Vanguard provides distribution and marketing services to the
                 funds. However, each fund bears its share of the Group's
                 distribution costs.
- -------------------------------------------------------------------------------

INVESTMENT       The Fund employs Mellon Capital Management Corporation, 595    
ADVISER          Market St., Suite 3000, San Francisco, CA 94105, as its        
                 investment adviser. Under an investment advisory agreement     
Mellon Capital   dated July 1, 1997, the adviser manages the investment and     
Management       reinvestment of the assets of the Fund and continuously        
manages the      reviews, supervises and administers the Fund's investment      
Fund's           program. The adviser discharges its responsibilities subject to
investments      the control of the Officers and Directors of the Fund.         


                                                                             9

<PAGE>

                 The adviser is a professional counseling firm which manages
                 well-diversified stock and bond portfolios for institutional
                 clients. As of September 30, 1997 the adviser provided
                 investment advisory services to 227 clients and managed assets
                 with an approximate value of $64.9 billion. The adviser's asset
                 allocation strategy was developed by the adviser's co-founder,
                 William Fouse, in 1972, and is used by 109 of its clients and
                 accounts for approximately $20.2 billion of the assets that it
                 manages. For its asset allocation clients, including the Fund,
                 the adviser employs a proprietary asset allocation model in
                 managing client investment portfolios and an indexing approach
                 in selecting individual equity securities. The Fund is one of
                 the adviser's two investment company clients.

                 The adviser was founded in October 1983 by William Fouse and
                 Thomas Loeb. They have been responsible for overseeing the
                 implementation of the firm's strategy for the Fund since the
                 Fund's inception in 1988. The adviser is a wholly-owned
                 subsidiary of MBC Investment Corporation, which itself is a
                 subsidiary of Mellon Bank Corporation.

                 The Fund pays the adviser a basic fee at the end of each fiscal
                 quarter, calculated by applying a quarterly rate, based on the
                 following annual percentage rates, to the Fund's average
                 month-end net assets for the quarter:

                           Net Assets                       Rate
                           ----------                       ----
                           First $100 million              .200%
                           Next $900 million               .150%
                           Next $500 million               .125%
                           Over $1.5 billion               .100%
    
                 This fee may be increased or decreased by applying an
                 adjustment formula based on the performance of the Fund
                 relative to the investment record of a "Combined-Index", 65% of
                 which shall be comprised of the Standard & Poor's 500 Composite
                 Price Index and 35% of which shall be comprised of the Lehman
                 Brothers Long-Term U.S. Treasury Index. The fee payment will be
                 increased (decreased) by an incentive (penalty) of 0.05% of
                 average net assets if the Fund's cumulative investment
                 performance for the thirty-six months preceding the end of the
                 quarter is at least six percentage points above (below) the
                 cumulative investment record of the Combined Index for the same
                 period. For the purpose of determining the fee adjustment for
                 investment performance, as described above, the net assets
                 of the Fund will be averaged over the same period as the
                 performance of the Fund and the investment record of the
                 Combined Index are computed. For the year ended September 30,
                 1997, the investment advisory fee paid by the Fund represented
                 an effective annual rate of 0.12% of the Fund's average net
                 assets, before a decrease of 0.03% based on performance.

                 The adviser is authorized to choose brokers or dealers to
                 handle the purchase and sale of the Fund's securities, and is
                 directed to get the best available price and most favorable
                 execution from these brokers with respect to all transactions.
                 At times, the adviser may choose brokers who charge higher
                 commissions in the
     
10
<PAGE>

                 interests of obtaining better execution of a transaction. If
                 more than one broker can obtain the best available price and
                 favorable execution of a transaction, then the adviser is
                 authorized to choose a broker who, in addition to executing the
                 transaction, will provide research services to the adviser or
                 the Fund. However, the adviser will not pay higher commissions
                 specifically for the purpose of obtaining research services.
                 The Fund may direct the adviser to use a particular broker for
                 certain transactions in exchange for commission rebates or
                 research services provided to the Fund.

                 The Fund has authorized the adviser to pay higher commissions
                 in recognition of brokerage services felt necessary for the
                 achievement of better execution, provided the adviser believes
                 this to be in the best interest of the Fund. Although the Fund
                 does not market its shares through intermediary brokers or
                 dealers, the Fund may place orders with qualified
                 broker-dealers who recommend the Fund to clients if the
                 Officers of the Fund believe that the quality of the
                 transaction and the commission are comparable to what they
                 would be with other qualified brokerage firms.

                 The Fund's Board of Directors may, without the approval of
                 shareholders, provide for: (a) the employment of a new
                 investment adviser pursuant to the terms of a new advisory
                 agreement, either as a replacement for an existing adviser or
                 as an additional adviser; (b) a change in the terms of an
                 advisory agreement; and (c) the continued employment of an
                 existing adviser on the same advisory contract terms where a
                 contract has been assigned because of a change in control of
                 the adviser. Any such change will only be made upon not less
                 than 30 days prior written notice to shareholders of the Fund
                 which shall include substantially the information concerning
                 the adviser that would have normally been included in a proxy
                 statement.
- -------------------------------------------------------------------------------
PERFORMANCE      The table on page 12 provides investment results for the Fund  
RECORD           for several periods throughout the Fund's lifetime. The results
                 shown represent "total return" investment performance, which   
                 assumes the reinvestment of all capital gains and income       
                 dividends for the indicated periods. Also included is          
                 comparative information with respect to the unmanaged Standard 
                 & Poor's 500 Composite Stock Price Index, a widely-used        
                 barometer of stock market activity, and the Consumer Price     
                 Index, a statistical measure of changes in the prices of goods 
                 and services. The tables do not make any allowance for federal,
                 state or local income taxes, which shareholders must pay on a  
                 current basis.                                                 

                 The results should not be considered a representation of the
                 total return from an investment made in the Fund today. This
                 information is provided to help investors better understand the
                 Fund and may not provide a basis for comparison with other
                 investments or mutual funds which use a different method to
                 calculate performance.

                                                                             11
<PAGE>

           Average Annual Return for Vanguard Asset Allocation Fund

         Fiscal Periods             Vanguard Asset     S&P 500      Consumer
         Ended 9/30/97             Allocation Fund      Index      Price Index
         --------------            ---------------    ---------    -----------
            1 Year                     +29.4%           +40.4%        +2.2%
            5 Years                     +16.7           +20.8         +2.7
            Lifetime*                   +15.7           +18.1          --

                   * November 3, 1988, to September 30, 1997.
- --------------------------------------------------------------------------------
    
DIVIDENDS,       The Fund expects to pay dividends semi-annually from ordinary  
CAPITAL GAINS    income. Net capital gains distributions, if any, will be 
AND TAXES        distributed annually.                                          
                                                                                
The Fund pays    In addition, in order to satisfy certain distribution          
semi-annual      requirements of the Tax Reform Act of 1986, the Fund may       
dividends and    declare special year-end dividend and capital gains         
any capital      distributions during December. Such distributions, if received
gains            by shareholders by January 31, are deemed to have been paid by
annually         the Fund and received by shareholders on December 31 of the
                 prior year.
                                                                                
                 Dividend and capital gains distributions may be automatically
                 reinvested or received in cash. See "Choosing a Distribution   
                 Option" for a description of these distribution methods.       

                 The Fund intends to continue to qualify for taxation as a
                 "regulated investment company" under the Internal Revenue Code
                 so that it will not be subject to federal income tax to the
                 extent its income is distributed to shareholders. Dividends
                 paid by the Fund from net investment income and net short-term
                 capital gains, whether received in cash or reinvested in
                 additional shares, will be taxable to shareholders as ordinary
                 income. For corporate investors, dividends from net investment
                 income and net short-term capital gains will generally qualify
                 in part for the intercorporate dividends-received deduction.
                 However, the portion of the dividends so qualified depends on
                 the aggregate taxable qualifying dividend income received by
                 the Fund from domestic (U.S.) sources.

                 Distributions paid by the Fund from long-term capital gains,
                 whether received in cash or reinvested in additional shares,
                 are taxable as long-term capital gains, regardless of the
                 length of time you have owned shares in the Fund. Long-term
                 gains may be taxed at different rates depending on how long the
                 Fund held the securities. Capital gains distributions are made
                 when the Fund realizes net capital gains on sales of portfolio
                 securities during the year. The Fund does not seek to realize
                 any particular amount of capital gains during a year; rather,
                 realized gains are a by-product of portfolio management
                 activities. Consequently, capital gains distributions may be
                 expected to vary considerably from year to year; there will be
                 no capital gains distributions in years when the Fund realizes
                 net capital losses.

                 Note that if you accept capital gains distributions in cash,
                 instead of reinvesting them in additional shares, you are in
                 effect reducing the capital at work for you in the Fund. Also,
                 keep in mind that if you purchase shares in the Fund shortly
     
12
<PAGE>
   
                 before the record date for a dividend or capital gains
                 distribution, a portion of your investment will be returned to
                 you as a taxable distribution, regardless of whether you are
                 reinvesting your distributions or receiving them in cash.

                 The Fund will notify you annually as to the tax status of 
                 dividend and capital gains distributions paid by the Fund.

A capital gain   A sale of shares of the Fund is a taxable event and may result 
or loss may be   in a capital gain or loss. A capital gain or loss may be       
realized upon    realized from an ordinary redemption of shares or an exchange  
exchange or      of shares between two mutual funds (or two portfolios of a     
redemption       mutual fund).                                                  
                                                                                
                 Dividend distributions, capital gains distributions, and       
                 capital gains or losses from redemptions and exchanges may be  
                 subject to state and local taxes.                              

                 The Fund is required to withhold 31% of taxable dividends,
                 capital gains distributions, and redemptions paid to
                 shareholders who have not complied with IRS taxpayer
                 identification regulations. You may avoid this withholding
                 requirement by certifying on your Account Registration Form
                 your proper Social Security or taxpayer identification number
                 and by certifying that you are not subject to backup
                 withholding.
    
                 The Fund has obtained a Certificate of Authority to do business
                 as a foreign corporation in Pennsylvania and does business and
                 maintains an office in that state. In the opinion of counsel,
                 the shares of the Fund are exempt from Pennsylvania personal
                 property taxes.

                 The tax discussion set forth above is included for general
                 information only. Prospective investors should consult their
                 own tax advisers concerning the tax consequences of an
                 investment in the Fund. The Fund is managed without regard to
                 tax ramifications.
- -------------------------------------------------------------------------------
   
THE SHARE PRICE  The Fund's share price, or "net asset value" per share, is
OF THE FUND      calculated by dividing the total assets of the Fund, less all  
                 liabilities, by the total number of shares outstanding. The net
                 asset value is determined as of the close of the New York Stock
                 Exchange (generally 4:00 p.m. Eastern time) on each day that
                 the exchange is open for trading.                     

                 Fund securities for which market quotations are readily
                 available (includes those securities listed on national
                 securities exchanges, as well as those quoted on the NASDAQ
                 Stock Market) will be valued at the last quoted sales price on
                 the day the valuation is made. Such securities which are not
                 traded on the valuation date are valued at the mean of the bid
                 and ask prices. Price information on exchange-listed securities
                 is taken from the exchange where the security is primarily
                 traded. Any foreign securities are valued at the latest quoted
                 sales price available before the time when assets are valued.
                 Securities may be valued on the basis of prices provided by a
                 pricing service when such prices are believed to reflect the
                 fair market value of such securities.
     

                                                                             13

<PAGE>


                 Short-term instruments (those with remaining maturities of 60
                 days or less) may be valued at cost, plus or minus any
                 amortized discount or premium, which approximates market value.

                 Bonds and other fixed income securities may be valued on the
                 basis of prices provided by a pricing service when such prices
                 are believed to reflect the fair market value of such
                 securities. The prices provided by a pricing service may be
                 determined without regard to bid or last sale prices of each
                 security, but take into account institutional-size transactions
                 in similar groups of securities as well as any developments
                 related to specific securities.

                 Other assets and securities for which no quotations are readily
                 available or which are restricted as to sale (or resale) are
                 valued by such methods as the Board of Directors deems in good
                 faith to reflect fair value.

                 The share price for the Fund can be found daily in the mutual
                 fund listings of most major newspapers under the heading of
                 Vanguard Funds.

- -------------------------------------------------------------------------------
GENERAL          The Fund is a Maryland corporation. The Articles of            
INFORMATION      Incorporation permit the Directors to issue 1,000,000,000      
                 shares of common stock, with a $.001 par value. The Board of   
                 Directors has the power to designate one or more classes       
                 ("series") of shares of common stock and to classify or        
                 reclassify any unissued shares with respect to such series.    
                 Currently the Fund is offering one class of shares.            
                                                                                
                 The shares of the Fund are fully paid and non-assessable; have 
                 no preference as to conversion, exchange, dividends, retirement
                 or other features; and have no pre-emptive rights. Such shares 
                 have non-cumulative voting rights, meaning that the holders of 
                 more than 50% of the shares voting for the election of         
                 Directors can elect 100% of the Directors if they so choose.   
                                                                                
                 Annual meetings of shareholders will not be held except as     
                 required by the Investment Company Act of 1940 and other       
                 applicable law. An annual meeting will be held to vote on the  
                 removal of a Director or Directors of the Fund if requested in 
                 writing by the holders of not less than 10% of the outstanding 
                 shares of the Fund.                                            
                                                                                
                 All securities and cash are held by State Street Bank and Trust
                 Company, Boston, MA. The Vanguard Group, Inc., Valley Forge,   
                 PA, serves as the Fund's Transfer and Dividend Disbursing      
                 Agent. Price Waterhouse LLP, serves as independent accountants 
                 for the Fund and audits its financial statements annually. The 
                 Fund is not involved in any litigation.                        
- -------------------------------------------------------------------------------

14

<PAGE>
                               SHAREHOLDER GUIDE

OPENING AN       You may open a regular (non-retirement) account, either by mail
ACCOUNT AND      or wire. Simply complete and return an Account Registration    
PURCHASING       Form and any required legal documentation, indicating the     
SHARES           amount you wish to invest. Your purchase must be equal to or   
                 greater than the $3,000 minimum initial investment requirement 
                 ($1,000 for Uniform Gifts/Transfers to Minors Act accounts).   
                 You must open a new Individual Retirement Account by mail (IRAs
                 may not be opened by wire) using a Vanguard IRA Adoption       
                 Agreement. Your purchase must be equal to or greater than the  
                 $1,000 minimum initial investment requirement for IRAs, but no 
                 more than $2,000 if you are making a regular IRA contribution. 
                 Rollover contributions are generally limited to the amount     
                 withdrawn within the past 60 days from an IRA or other         
                 qualified Retirement Plan. If you need assistance with the     
                 forms or have any questions about the Fund, please call our    
                 Investor Information Department at 1-800-662-7447.             

                 Note: For other types of account registrations (e.g.
                 corporations, associations, other organizations, trusts or
                 powers of attorney), please call us to determine which
                 additional forms you may need.

                 The Fund's shares are purchased at the next-determined net
                 asset value after your investment has been received. The Fund
                 is offered on a no-load basis (i.e., there are no sales
                 commissions or 12b-1 fees).

Purchase         1) Because of the risks associated with common stock and bond  
Restrictions        investments, the Fund is intended to be a long-term         
                    investment vehicle and is not designed to provide investors 
                    with a means of speculating on short-term market movements. 
                    Consequently, the Fund reserves the right to reject any     
                    specific purchase (and exchange purchase) request. The Fund 
                    also reserves the right to suspend the offering of shares   
                    for a period of time.                                       
                                                                                
                 2) Vanguard will not accept third-party checks to purchase     
                    shares of the Fund. Please be sure your purchase check is   
                    made payable to the Vanguard Group.                         

Additional       Subsequent investments to regular accounts may be made by mail 
Investments      ($100 minimum), wire ($1,000 minimum), exchange from another  
                 Vanguard Fund account, or Vanguard Fund Express. Subsequent    
                 investments to Individual Retirement Accounts may be made by   
                 mail ($100 minimum) or exchange from another Vanguard Fund     
                 account. In some instances, contributions may be made by wire  
                 or Vanguard Fund Express. Please call us for more information  
                 on these options.                                              
                 ------------------------------------------------------------   

                                                                            15
<PAGE>

<TABLE>
<CAPTION>
<S>                               <C>                                         <C>    
                                                                                  ADDITIONAL INVESTMENTS
                                             NEW ACCOUNT                            TO EXISTING ACCOUNTS
Purchasing By Mail                 Please include the amount of your          Additional investments should
Complete and sign the              initial investment on the registra-        include the Invest-by-Mail remit-
enclosed Account                   tion form, make your check pay-            tance form attached to your Fund
Registration Form                  able to The Vanguard Group-78              confirmation statements. Please
                                   and mail to:                               make your check payable to The
                                                                              Vanguard Group-78, write your
                                   Vanguard Financial Center                  account number on your check
                                   P.O. Box 2600                              and, using the return envelope pro-
                                   Valley Forge, PA 19482-2600                vided, mail to the address indicated
                                                                              on the Invest-by-Mail Form.

For Express                        Vanguard Financial Center                  All written requests should be
or registered mail,                455 Devon Park Drive                       mailed to one of the addresses indi-
send to:                           Wayne, PA 19087-1815                       cated for new accounts. Do not
                                                                              send registered or express mail to
                                                                              the post office box address. 
</TABLE>

                  ------------------------------------------------------------
Purchasing By Wire                 CORESTATES BANK, N.A.            
Money should be                    ABA 031000011                    
wired to:                          CORESTATES NO. 0101 9897         
                                   ATTN VANGUARD                    
Before Wiring                      VANGUARD ASSET ALLOCATION FUND   
Please contact                     ACCOUNT NUMBER                   
Client Services                    ACCOUNT REGISTRATION             
(1-800-662-2739)                   

                 To ensure proper receipt, please be sure your bank includes the
                 name of the Fund, the account number Vanguard has assigned to  
                 you and the eight-digit CoreStates number. If you are opening a
                 new account, please complete the Account Registration Form and 
                 mail it to the "New Account" address after completing your wire
                 arrangement. Note: Federal Funds wire purchase orders will be  
                 accepted only when the Fund and Custodian Bank are open for    
                 business.                                                      
                 ------------------------------------------------------------   
Purchasing By    You may open an account or purchase additional shares by making
Exchange (from   an exchange from another Vanguard Fund account. However, the   
a Vanguard       Fund reserves the right to refuse any exchange purchase        
account)         request. Call our Client Services Department toll-free at      
                 1-800-662-2739. The new account will have the same registration
                 as the existing account.                                       
                 ------------------------------------------------------------   
Purchasing By    The Fund Express Special Purchase option lets you move money  
Fund Express     from your bank account to your Vanguard account at your       
Special          request. Or if you choose the Automatic Investment option,    
Purchase and     money will be moved from your bank account to your Vanguard   
Automatic        account on the schedule (monthly, bimonthly [every other      
Investment       month],                                                       
     

16

<PAGE>
                 quarterly, semiannually or yearly) you select. To establish
                 these Fund Express options, please provide the appropriate
                 information on the Account Registration Form. We will send you
                 a confirmation of your Fund Express service; please wait two
                 weeks before using the service.
- --------------------------------------------------------------------------------
   
CHOOSING A       You must select one of three distribution options:             
DISTRIBUTION                                                                    
OPTION           1. Automatic Reinvestment Option -- Both dividend and capital  
                    gains distributions will be reinvested in additional Fund   
                    shares. This option will be selected for you unless you     
                    specify one of the other options.                           
                                                                                
                 2.Cash Dividend Option -- Your dividends will be paid in cash  
                    and your capital gains will be reinvested in additional Fund
                    shares.                                                     
                                                                                
                 3.All Cash Option -- Both dividend and capital gains
                    distributions will be paid in cash.                         
                                                                                
                 You may change your option by calling our Client Services      
                 Department (1-800-662-2739).                                   
                                                                                
                 If a shareholder has chosen to receive dividend and/or capital 
                 gains distributions in cash, and the postal or other delivery
                 service is unable to deliver checks to the shareholder's       
                 address of record, we will change the distribution option so   
                 that all dividends and other distributions are automatically   
                 reinvested in additional shares. We will not pay interest on   
                 uncashed distribution checks.                                  
                                                                                
                 In addition, an option to invest your cash dividend and/or     
                 capital gains distributions in another Vanguard Fund account is
                 available. Please call our Client Services Department          
                 (1-800-662-2739) for information. You may also elect Vanguard  
                 Dividend Express which allows you to transfer your cash        
                 dividend and/or capital gain distributions automatically to    
                 your bank account. Please see "Other Vanguard Services" for    
                 more information.                                              
    
- --------------------------------------------------------------------------------
   
TAX CAUTION      Under Federal tax laws, the Fund is required to distribute net 
                 capital gains and dividend income to Fund shareholders. These  
Investors        distributions are made to all shareholders who own Fund shares
should ask       as of the distribution's record date, regardless of how long   
about the        the shares have been owned. Purchasing shares just prior to the
timing           record date could have a significant impact on your tax        
of capital       liability for the year. For example, if you purchase shares    
gains            immediately prior to the record date of a sizable capital gain 
and dividend     or income dividend distribution, you will be assessed taxes on 
distributions    the amount of the capital gain and/or dividend distribution    
before           later paid even though you owned the Fund shares for just a    
investing        short period of time. (Taxes are due on the distributions even 
                 if the dividend or gain is reinvested in additional Fund       
                 shares.) While the total value of your investment will be the  
                 same after the distribution -- the amount of the distribution  
                 will offset the drop in the net asset value of the shares --   
                 you should be aware of the tax implications the timing of your 
                 purchase may have.                                             
    


                                                                            17

<PAGE>

   
                 Prospective investors should, therefore, inquire about
                 potential distributions before investing. The Fund's annual
                 capital gain distributions normally occur in December, while
                 income dividends are generally paid semi-annually in June and
                 December. In addition, the Fund may occasionally be required to
                 make supplemental dividend or capital gains distributions at
                 some other time during the year. For additional information on
                 distributions and taxes, see the section titled "Dividends,
                 Capital Gains and Taxes."
    
- -------------------------------------------------------------------------------

IMPORTANT        The easiest way to establish optional Vanguard services on 
INFORMATION      your account is to select the options you desire when you  
                 complete your Account Registration Form.                   
                                                        
Optional ServicesIf you wish to add shareholder options later, you may need 
                 to provide Vanguard with additional information and a       
                 signature guarantee. Please call our Client Services        
                 Department (1-800-662-2739) for further assistance.         


Signature        For our mutual protection, we may require a signature       
Guarantees       guarantee on certain written transaction requests. A        
                 signature guarantee verifies the authenticity of your        
                 signature and may be obtained from banks, brokers and any    
                 other guarantor that Vanguard deems acceptable. A signature  
                 guarantee cannot be provided by a notary public.             
             
Certificates     Share certificates will be issued upon request. If a
                 certificate is lost, you may incur an expense to replace it.

Broker-Dealer    If you purchase shares in Vanguard Funds through a 
Purchases        registered broker-dealer or investment adviser, the
                 broker-dealer or adviser may charge a service fee. 
                 
Cancelling       The Fund will not cancel any trade (e.g., a purchase,
Trades           exchange, or redemption) believed to be authentic, received
                 in writing or by telephone, once the trade has been
                 received.


Electronic       You may receive a prospectus for the Fund or any of the   
Prospectus       Vanguard Funds in an electronic format through Vanguard's 
Delivery         website at www.vanguard.com. For additional information   
                 please see "Other Vanguard Services-Computer Access."     

- --------------------------------------------------------------------------------

WHEN YOUR        Your trade date is the date on which your account is        
ACCOUNT WILL BE  credited. If your purchase is made by check, Federal Funds    
CREDITED         wire, or exchange, and is received by the close of trading  
                 on the New York Stock Exchange (generally 4:00 p.m. Eastern 
                 time), your trade date is the day of receipt. If your       
                 purchase is received after the close of the Exchange, your  
                 trade date is the next business day. Your shares are        
                 purchased at the net asset value determined on your trade   
                 date.                                                         

                 In order to prevent lengthy processing delays caused by the
                 clearing of foreign checks, Vanguard will only accept a
                 foreign check which has been drawn in U.S. dollars and has
                 been issued by a foreign bank with a U.S. correspondent
                 bank. The name of the U.S. correspondent bank must be
                 printed on the face of the foreign check.

- --------------------------------------------------------------------------------



18

<PAGE>






SELLING YOUR     You may withdraw any portion of the funds in your account
SHARES           by redeeming shares at any time (please see "Important
                 Redemption Information"). You generally may initiate a request
                 by writing or by telephoning. Your redemption proceeds are
                 normally mailed within two business days after the receipt of
                 the request in Good Order. No interest will accrue on amounts
                 represented by uncashed redemption checks.

                 ------------------------------------------------------------

Selling By Mail  Requests should be mailed to Vanguard Financial Center,
                 Vanguard Asset Allocation Fund, P.O. Box 1120, Valley
                 Forge, PA 19482-1120. (For express or registered mail, send
                 your request to Vanguard Financial Center, Vanguard Asset
                 Allocation Fund, 455 Devon Park Drive, Wayne, PA
                 19087-1815.)

                 The redemption price of shares will be the Fund's net asset
                 value next determined after Vanguard has received all
                 required documents in Good Order.

                 ------------------------------------------------------------
Definition of    Good Order means that the request includes the following:
Good Order

                 1. The account number and Fund name.
                 2. The amount of the transaction (specified in dollars or
                    shares).
                 3. Signatures of all owners exactly as they are registered
                    on the account.
                 4. Any required signature guarantees.
                 5. Other supporting legal documentation that may be
                    required in the case of estates, corporations, trusts and
                    certain other accounts.
                 6. Any certificates you hold for the account.

                 If you have questions about this definition as it pertains
                 to your request, please call our Client Services Department
                 at 1-800-662-2739.

                 ------------------------------------------------------------

Selling By       To sell shares by telephone, you or your pre-authorized       
Telephone        representative may call our Client Services Department at     
                 1-800-662-2739. The proceeds will be sent to you by mail.     
                 

                 Please Note: As a protection against fraud, your telephone
                 mail redemption privilege will be suspended for 15 calendar
                 days following any expedited address change to your account.
                 An expedited address change is one that is made by telephone
                 or in writing, without the signatures of all account owners.
                 Please see "Important Information About Telephone
                 Transactions."

                 ------------------------------------------------------------

Selling By Fund  If you select the Fund Express Automatic Withdrawal option, 
Express          money will be automatically moved from your Vanguard Fund   
                 account to your bank account according to the schedule you  
Automatic        have selected. The Special Redemption option lets you move  
Withdrawal       money from your Vanguard account to your bank account on    
& Special        your request. You may elect Fund Express on the Account     
Redemption       Registration Form or call our Investor Information          
                 Department at 1-800-662-7447 for a Fund Express application.
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 








                                                                             19

<PAGE>



Selling By       You may sell shares by making an exchange to another Vanguard 
Exchange         Fund account. Please see "Exchanging Your Shares" for details.
                 ------------------------------------------------------------
Important        Shares purchased by check or Fund Express may be redeemed at   
Redemption       any time. However, your redemption proceeds will not be paid  
Information      until payment for the purchase is collected, which may take up 
                 to ten calendar days.                                          
                 ---------------------------------------------------------------

Delivery of      Redemption requests received by telephone prior to the close of
Redemption       trading on the New York Stock Exchange (generally 4:00 p.m.    
Proceeds         Eastern time) are processed on the day of receipt and the      
                 redemption proceeds are normally sent on the following business
                 day.                                                           


                 Redemption requests received by telephone after the close of
                 the Exchange are processed on the business day following
                 receipt and the proceeds are normally sent on the second
                 business day following receipt. The Fund reserves the right to
                 revise or terminate the telephone redemption privilege at any
                 time.

                 Redemption proceeds must be sent to you within seven days of
                 receipt of your request in Good Order except as described in
                 "Important Redemption Information."

                 If you experience difficulty in making a telephone redemption
                 during periods of drastic economic or market changes, your
                 redemption request may be made by regular or express mail. It
                 will be implemented at the net asset value next determined
                 after your request has been received by Vanguard in Good Order.

                 The Fund may suspend the redemption right or postpone payment
                 at times when the New York Stock Exchange is closed or under
                 any emergency circumstances as determined by the United States
                 Securities and Exchange Commission.

                 If the Board of Directors determines that it would be
                 detrimental to the best interests of the Fund's remaining
                 shareholders to make payment in cash, the Fund may pay
                 redemption proceeds in whole or in part by a distribution in
                 kind of readily marketable securities.

                 ------------------------------------------------------------

Vanguard's       If you make a redemption from a qualifying account, Vanguard   
Average          will send you an Cost Statement Average which provides you with
Cost Statement   the cost and tax basis of the shares you redeemed. Please see  
                 "Statements and Reports" for additional information.           
                 
                 ------------------------------------------------------------

Low Balance Fee  Due to the relatively high cost of maintaining smaller         
and Minimum      accounts, the Fund will automatically deduct a $10 annual fee  
Account Balance  in either June or December from non-retirement accounts with  
Requirement      balances falling below $2,500 ($500 for Uniform Gifts/Transfers
                 to Minors Act accounts). The fee generally will be waived for  
                 investors whose aggregate Vanguard assets exceed $50,000. In   
                 addition, the Fund reserves the right to liquidate any         
                 non-retirement account that is below the minimum initial       
                 investment. In such a case, you may be notified that the value 
                 of your account is below the Fund's minimum account balance    
                 requirement. You would then be allowed 60 days to make an      
                 additional investment before the                               



20
<PAGE>

                 account is liquidated. Proceeds would be promptly paid to the
                 registered shareholder.

                 Vanguard will not liquidate your account if it has fallen below
                 $3,000 solely as a result of declining markets (i.e., a decline
                 in the Fund's net asset value).

                 ---------------------------------------------------------------

EXCHANGING YOUR  Should your investment goals change, you may exchange your   
SHARES           shares of Vanguard Asset Allocation Fund for those of other  
                 available Vanguard Funds.                                    
                 
Exchanging by    In addition to the details below, please see "Important   
Telephone        Information About Telephone Transactions."               

Call Client      When exchanging shares by telephone, please have ready the Fund
Services         name, account number, Social Security number or employer       
(1-800-662-2739) identification number listed on the account, and the exact name
                 and address in which the account is registered. Only the       
                 registered shareowner (or his or her preauthorized             
                 representative) may complete such an exchange. Requests for    
                 telephone exchanges received prior to the close of trading on  
                 the New York Stock Exchange (generally 4:00 p.m. Eastern time) 
                 are processed at the close of business that same day.          
   
                 Requests received after the close of the Exchange are processed
                 the next business day. Telephone exchanges are not accepted
                 into or from non-IRA investments in Vanguard Index Trust,
                 Vanguard Balanced Index Fund, Vanguard International Equity
                 Index Fund, Vanguard STAR Fund-Total International Portfolio,
                 Vanguard Growth and Income Portfolio (formerly known as
                 Vanguard Quantitative Portfolios) and Vanguard REIT Index
                 Portfolio. If you experience difficulty in making a telephone
                 exchange, your exchange request may be made by regular or
                 express mail, and it will be implemented at the closing net
                 asset value on the date received by Vanguard provided the
                 request is received in Good Order.
    
                 Neither the Fund nor Vanguard is responsible for the
                 authenticity of exchange instructions received by telephone.
                 Investors bear the full risk of any loss arising from
                 unauthorized telephone exchanges. To prohibit telephone
                 exchanges on your account, please notify the Fund in writing.
                 Otherwise, the telephone exchange privilege will be
                 automatically established for your account.

                 ---------------------------------------------------------------

Exchanging By    Please be sure to include on your exchange request the name and
Mail             account number of your current Fund, the name of the Fund you  
                 wish to exchange into, the amount you wish to exchange, and the
                 signatures of all registered account holders. Send your request
                 to Vanguard Financial Center, Vanguard Asset Allocation Fund,  
                 P.O. Box 1120, Valley Forge, PA 19482-1120. (For express or    
                 registered mail, send your request to Vanguard Financial       
                 Center, Vanguard Asset Allocation Fund, 455 Devon Park Drive,  
                 Wayne, PA 19087-1815.)                                         

                 ---------------------------------------------------------------

Exchanging       You may use your personal computer to exchange shares of most  
Online           Vanguard funds by accessing Vanguard's website                 
                 (www.vanguard.com). To establish this service on your account, 
                 you must first register through our website. We will then send 
                 to you by mail, an account access password that will enable you
                 to make online exchanges.                                      
                 
                 



                                                                              21

<PAGE>



                 The Vanguard funds that you cannot purchase or sell through
                 online exchange are Vanguard Index Trust, Vanguard Balanced
                 Index Fund, Vanguard International Equity Index Fund, Vanguard
                 REIT Index Portfolio, Vanguard Total International Portfolio,
                 and Vanguard Growth and Income Portfolio (formerly known as
                 Vanguard Quantitative Portfolios). These funds do permit online
                 exchanges within IRAs and other retirement accounts.

                 ---------------------------------------------------------------

Important        Before you make an exchange, you should consider the following:
Exchange                                                                        
Information      o Please read the Fund's prospectus before making an exchange. 
                   For a copy and for answers to any questions you may have,    
                   call our Investor Information Department (1-800-662-7447).   
                                                                                
                 o An exchange is treated as a redemption and a purchase.       
                   Therefore, you could realize a taxable gain or loss on the   
                   transaction.                                                 
                                                                                
                 o Exchanges by telephone are accepted only if the registrations
                   and the taxpayer identification numbers of the two accounts  
                   are identical.                                               
                                                                                
                 o In order to exchange into an account with a different        
                   registration (including a different name, address, or        
                   taxpayer identification number), you must obtain the         
                   guaranteed signatures of all current account owners on your  
                   written instructions.                                        
                                                                                
                 o The shares to be exchanged must be on deposit and not held in
                   certificate form.

                 o New accounts are not currently accepted in Vanguard/Windsor
                   Fund.                                    
                                                                                
                 o The redemption price of shares redeemed by exchange is the   
                   net asset value next determined after Vanguard has received  
                   the required documentation in Good Order.                    
                                                                                
                 o When opening a new account by exchange, you must meet the    
                   minimum investment requirement of the new Fund.              
                                                                                
                 Every effort will be made to maintain the exchange privilege.  
                 However, the Fund reserves the right to revise or terminate its
                 provisions, limit the amount of, or reject any exchange, as    
                 deemed necessary, at any time.                                 
                                                                                
                 The exchange privilege is only available in states in which the
                 shares of the Fund are registered for sale. The Fund's shares  
                 are currently registered for sale in all 50 states and the Fund
                 intends to maintain such registration.                         

- --------------------------------------------------------------------------------

EXCHANGE         The Fund's exchange privilege is not intended to afford        
PRIVILEGE        shareholders a way to speculate on short-term movements in the 
LIMITATIONS      market. Accordingly, in order to prevent excessive use of the  
                 exchange privilege that may potentially disrupt the management 
                 of the Fund and increase transaction costs, the Fund has       
                 established a policy of limiting excessive exchange activity.  
                                                                                
                 Exchange activity generally will not be deemed excessive if    
                 limited to two substantive exchange redemptions (at least 30   
                 days apart) from the Fund during any twelve month period.      
                 "Substantive" means either a dollar amount large               
                 

22

<PAGE>


                 enough to have a negative impact on the Fund or a series of
                 movements between Vanguard portfolios. Notwithstanding these
                 limitations, the Fund reserves the right to reject any purchase
                 request (including exchange purchases from other Vanguard
                 portfolios) that is reasonably deemed to be disruptive to
                 efficient portfolio management.
- --------------------------------------------------------------------------------

IMPORTANT        The ability to initiate redemptions (except wire or Fund       
INFORMATION      Express redemptions) and exchanges by telephone is             
ABOUT TELEPHONE  automatically established on your account unless you request in
TRANSACTIONS     writing that telephone transactions on your account not be     
                 permitted.                                                     
                 
                 To protect your account from losses resulting from unauthorized
                 or fraudulent telephone instructions, Vanguard adheres to the
                 following security procedures:

                 1. Security Check. To request a transaction by telephone, the
                    caller must know (i) the name of the Portfolio; (ii) the
                    10-digit account number; (iii) the exact name and address
                    used in the registration; and (iv) the Social Security or
                    employer identification number listed on the account.

                 2. Payment Policy. The proceeds of any telephone redemption by
                    mail will be made payable to the registered shareowner and
                    mailed to the address of record, only.

                 Neither the Fund nor Vanguard will be responsible for the
                 authenticity of transaction instructions received by telephone,
                 provided that reasonable security procedures have been
                 followed. Vanguard believes that the security procedures
                 described above are reasonable and that if such procedures are
                 followed, you will bear the risk of any losses resulting from
                 unauthorized or fraudulent telephone transactions on your
                 account.

- --------------------------------------------------------------------------------

TRANSFERRING     You may transfer the registration of any of your Fund shares to
REGISTRATION     another person by completing a transfer form and sending it to:
                 Vanguard Financial Center, P.O. Box 1110, Valley Forge, PA     
                 19482-1110, Attention: Transfers Department. The request must  
                 be in Good Order. To receive a transfer form and full          
                 instructions, please call our Client Services Department       
                 (1-800-662-2739).                                              

- --------------------------------------------------------------------------------

STATEMENTS AND   Vanguard will send you a confirmation statement each time you  
REPORTS          initiate a transaction in your account, except for            
                 checkwriting redemptions from Vanguard money market accounts.  
                 You will also receive a comprehensive account statement at the 
                 end of each calendar quarter. The fourth-quarter statement will
                 be a year-end statement, listing all transaction activity for  
                 the entire calendar year.                                      
                                                                                
                 Vanguard's Average Cost Statement provides you with the average
                 cost of shares redeemed from your account during the calendar  
                 year, using the average cost single category method. This      
                 service is available for most taxable accounts opened since    
                 January 1, 1986. In general, investors who redeemed shares from
                 a qualifying Vanguard account may expect to receive their      
                 Average Cost Statement along                                   
                 
                 
                 


                                                                              23


<PAGE>



                 with their Portfolio Summary Statement. Please call our Client
                 Services Department (1-800-662-2739) for information.

                 Financial reports on the Fund will be mailed to you
                 semi-annually, according to the Fund's fiscal year-end.


- --------------------------------------------------------------------------------
OTHER VANGUARD   For more information about any of these services, please call  
SERVICES         our Investor Information Department at 1-800-662-7447.         
                                                                                
Vanguard Direct  With Vanguard's Direct Deposit Service, most U.S. Government   
Deposit Service  checks (including Social Security and military pension checks) 
                 and private payroll checks may be automatically deposited into 
                 your Vanguard Fund account. Separate brochures and forms are   
                 available for direct deposit of U.S. Government and private    
                 payroll checks.                                                

Vanguard         Vanguard's Automatic Exchange Service allows you to move money 
Automatic        automatically among your Vanguard Fund accounts. For instance, 
Exchange         the service can be used to "dollar cost average" from a money  
Service          market portfolio into a stock or bond fund or to contribute to 
                 an IRA or other retirement plan. Please contact our Client     
                 Services Department at 1-800-662-2739 for additional           
                 information.                                                   
                 
Vanguard Fund    Vanguard's Fund Express allows you to transfer money between   
Express          your Fund account and your account at a bank, savings and loan 
                 association, or a credit union that is a member of the         
                 Automated Clearing House (ACH) system. You may elect this      
                 service on the Account Registration Form or call our Investor  
                 Information Department (1-800-662-7447) for a Fund Express     
                 application.                                                   
                                                                                
                 Special rules govern how your Fund Express purchases or        
                 redemptions are credited to your account. In addition, some    
                 services of Fund Express cannot be used with specific Vanguard 
                 Funds. For more information, please refer to the Vanguard Fund 
                 Express brochure.                                        
   

Vanguard         Vanguard's Dividend Express allows you to transfer your       
Dividend         dividend and/or capital gains distributions automatically from 
Express          your Fund account, one business day after the Fund's payable  
                 date, to your account at a bank, savings and loan association,
                 or credit union that is a member of the Automated Clearing    
                 House (ACH) network. You may elect this service on the Account
                 Registration Form or call our Investor Information Department 
                 (1-800-662-7447) for a Vanguard Dividend Express application. 
                
Vanguard         Vanguard's Tele-Account is a convenient, automated service that
Tele-Account(R)  provides share price, price change and yield quotations on     
                 Vanguard Funds through any TouchTone(TM) telephone. This       
                 service also lets you obtain information about your account    
                 balance, your last transaction, and your most recent dividend  
                 or capital gains payment. In addition, you may perform
                 investment exchanges of Vanguard Fund shares and redemptions by
                 check using Tele-Account. To contact Vanguard's Tele-Account   
                 service, dial 1-800-ON-BOARD (1-800-662-6273). A brochure      
                 offering detailed operating instructions is available from our 
                 Investor Information Department (1-800-662-7447).              
                      



24

<PAGE>


Computer Access


Vanguard Online  Use your personal computer to learn more about Vanguard funds
www.vanguard.com and services; keep in touch with your Vanguard accounts; map 
                 out a long-term investment strategy; initiate certain        
                 transactions; and ask questions, make suggestions, and send  
                 messages to Vanguard.                                        

                 Our education-oriented website provides timely news and
                 information about Vanguard funds and services; an online
                 "university" that offers a variety of mutual fund classes; and
                 easy-to-use, interactive tools to help you create your own
                 investment and retirement strategies.

- --------------------------------------------------------------------------------
                                                                              25



<PAGE>




                     (This page intentionally left blank.)

26

<PAGE>




- -----------------
The Vanguard Group
Vanguard Financial Center
P.O. Box 2600
Valley Forge, PA 19482


Investor Information
 Department:
1-800-662-7447 (SHIP)
                                                   P R O S P E C T U S 
                                                                       
Client Services                                                        
 Department:                                                           
1-800-662-2739 (CREW)                                                  
                                                    JANUARY 16, 1998   
                                              

Tele-Account for
 24-Hour Access:
1-800-662-6273 (ON-BOARD)

Telecommunication Service
 for the Hearing-Impaired:
1-800-662-2738

Transfer Agent:
The Vanguard Group, Inc.
Vanguard Financial Center
Valley Forge, PA 19482









P078
                                                              

<PAGE>



                                     PART B

                      VANGUARD ASSET ALLOCATION FUND, INC.


                       STATEMENT OF ADDITIONAL INFORMATION
                                January 16, 1998

     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated January 16, 1998). To obtain the
Prospectus please call:



                         Investor Information Department
                              1-800-662-7447 (SHIP)


                                TABLE OF CONTENTS




                                                        Page
                                                       ------
    Futures Contracts and Options  ..................    B-1  
    Portfolio Transactions   ........................    B-4
    Description of U.S. Government Securities  ......    B-5
    Description of Repurchase Agreements ............    B-5
    Investment Limitations   ........................    B-5
    Purchase of Shares ..............................    B-7
    Redemption of Shares  ...........................    B-8
    Management of the Fund   ........................    B-9
    Performance Measures  ...........................    B-12
    Total Return ....................................    B-14
    Investment Advisory Services   ..................    B-14
    Glossary  .......................................    B-17
    Financial Statements  ...........................    B-18
                                                 


                       INVESTMENT OBJECTIVES AND POLICIES


     The following policies supplement the Fund's investment objectives and
policies set forth in the Prospectus:


                         FUTURES CONTRACTS AND OPTIONS

     The Fund may enter into stock index and fixed-income futures contracts,
stock index and fixed income options, and options on such futures contracts to
remain fully invested, or to reduce transactions costs. Futures contracts
provide for the future sale by one party and purchase by another party of a
specified amount of a specific security or index at a specified future time and
at a specified price. Futures contracts which are standardized as to maturity
date and underlying financial instrument are traded on national futures
exchanges. Futures exchanges and trading are regulated under the Commodity
Exchange Act by the Commodity Futures Trading Commission ("CFTC"), a U.S.
Government Agency. Assets committed to futures contracts will be segregated at
the Fund's custodian bank to the extent required by law.

     Although many fixed-income futures contracts call for actual delivery or
acceptance of the underlying securities at a specified date (stock index futures
contracts do not permit delivery of securities), the contracts are normally
closed out before the settlement date without the making or taking of delivery.
Closing out an open futures position is done by taking an opposite position
("buying" a contract which has previously been "sold," "selling" a contract
previously "purchased") in an identical contract to terminate the position.
Brokerage commissions are incurred when a futures contract is bought or sold.



                                                                             B-1

<PAGE>



     Futures traders are required to make a good faith margin deposit in cash or
government securities with a broker or custodian to initiate and maintain open
positions in futures contracts. A margin deposit is intended to assure
completion of the contract (delivery or acceptance of the underlying security)
if it is not terminated prior to the specified delivery date. Minimal initial
margin requirements are established by the futures exchange and may be changed.
Brokers may establish deposit requirements which are higher than the exchange
minimums. Futures contracts are customarily purchased and sold on margin which
may range upward from less than 5% of the value of the contract being traded.


     After a futures contract position is opened, the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the margin on deposit does not satisfy margin requirements, payment of
additional "variation" margin will be required. Conversely, change in the
contract value may reduce the required margin, resulting in a repayment of
excess margin to the contract holder. Variation margin payments are made to and
from the futures broker for as long as the contract remains open. The Fund
expects to earn interest income on its margin deposits.


     Traders in futures contracts may be broadly classified as either "hedgers"
or "speculators." Hedgers use the futures markets primarily to offset
unfavorable changes (anticipated or potential) in the value of securities
currently owned or expected to be acquired by them. Speculators are less
inclined to own the securities underlying the futures contracts which they
trade, and use futures contracts with the expectation of realizing profits from
fluctuations in the value of the underlying securities. The Fund intends to use
futures contracts only for bona fide hedging purposes.


     Regulations of the CFTC applicable to the Portfolio require that all of its
futures transactions constitute bona fide hedging transactions except to the
extent that the aggregate initial margins and premiums required to establish any
non-hedging positions do not exceed five percent of the value of the Fund's
portfolio. The Portfolio will only sell futures contracts to protect securities
it owns against price declines or purchase contracts to protect against an
increase in the price of securities it intends to purchase. As evidence of this
hedging interest, the Portfolio expects that approximately 75% of its futures
contract purchases will be "completed," that is, equivalent amounts of related
securities will have been purchased or are being purchased by the Fund upon sale
of open futures contracts.


Restrictions on the Use of Futures Contracts and Options


     The Fund will not enter into futures contract transactions to the extent
that, immediately thereafter, the sum of its initial margin deposits on open
contracts exceeds 5% of the Portfolio's total assets.


Risk Factors in Futures Transactions


     Positions in futures may be closed out only on an Exchange which provides a
secondary market for such futures. However, there can be no assurance that a
liquid secondary market will exist for any particular futures contract at any
specific time. Thus, it may not be possible to close a futures position. In the
event of adverse price movements, the Fund would continue to be required to make
daily cash payments to maintain its required margin. In such situations, if the
Fund has insufficient cash, it may have to sell portfolio securities to meet
daily margin requirements at a time when it may be disadvantageous to do so. The
inability to close options and futures positions also could have an adverse
impact on the ability to hedge effectively.


     A Fund will minimize the risk that it will be unable to close out a futures
contract by only entering into futures which are traded on national futures
exchanges and for which there appears to be a liquid secondary market.



B-2


<PAGE>




     The risk of loss in trading futures contracts in some strategies can be
substantial, due both to the low margin deposits required, and the extremely
high degree of leverage involved in futures contracts. As a result, a relatively
small price movement in a futures contract may result in immediate and
substantial loss (or gain) to the investor. For example, if at the time of
purchase, 10% of the value of the futures contract is deposited as margin, a
subsequent 10% decrease in the value of the futures contract would result in a
total loss of the margin deposit, before any deduction for the transaction
costs, if the account were then closed out. A 15% decrease would result in a
loss equal to 150% of the original margin deposit if the contract were closed
out. Thus, a purchase or sale of a futures contract may result in losses in
excess of the amount invested in the contract. The Fund also bears the risk that
the Adviser will incorrectly predict future market trends. However, because the
futures strategies of the Portfolio are engaged in only for hedging purposes,
the adviser does not believe that the Fund is subject to the risks of loss
frequently associated with futures transactions. The Fund would presumably have
sustained comparable losses if, instead of the futures contract, it had invested
in the underlying financial instrument and sold it after the decline.


     Utilization of futures transactions by the Fund does involve the risk of
imperfect or no correlation where the securities underlying futures contracts
have different maturities than the portfolio securities being hedged. It is also
possible that the Fund could both lose money on futures contracts and also
experience a decline in value of its portfolio securities. There is also the
risk of loss by the Fund of margin deposits in the event of bankruptcy of a
broker with whom the Fund has an open position in a futures contract or related
option.


     Most futures exchanges limit the amount of fluctuation permitted in some
futures contract prices during a single trading day. The daily limit establishes
the maximum amount that the price of a futures contract may vary either up or
down from the previous day's settlement price at the end of a trading session.
Once the daily limit has been reached in a particular type of contract, no
trades may be made on that day at a price beyond that limit. The daily limit
governs only price movement during a particular trading day and therefore does
not limit potential losses, because the limit may prevent the liquidation of
unfavorable positions. Futures contract prices have occasionally moved to the
daily limit for several consecutive trading days with little or no trading,
thereby preventing prompt liquidation of future positions and subjecting some
futures traders to substantial losses.


Federal Tax Treatment of Futures Contracts


     The Fund is required for Federal income tax purposes to recognize as income
for each taxable year its net unrealized gains and losses on futures contracts
as of the end of the year as well as those actually realized during the year. In
most cases, any gain or loss recognized with respect to a futures contract is
considered to be 60% long-term capital gain or loss and 40% short-term capital
gain or loss, without regard to the holding period of the contract. Furthermore,
sales of futures contracts which are intended to hedge against a change in the
value of securities held by the Fund may affect the holding period of such
securities and, consequently, the nature of the gain or loss on such securities
upon disposition. The Fund may be required to defer the recognition of losses on
futures contracts to the extent of any unrecognized gains on related positions
held by the Fund.


     In order for the Fund to continue to qualify for Federal income tax
treatment as a regulated investment company, at least 90% of its gross income
for a taxable year must be derived from qualifying income; i.e., dividends,
interest income derived from loans of securities, and gains from the sale of
securities or foreign currencies, or other income derived with respect to its
business of investing in such securities or currencies. It is anticipated that
any net gain realized from the closing out of futures contracts will be
considered gain from the sale of securities and therefore be qualifying income
for purposes of the 90% requirement.



                                                                             B-3


<PAGE>




     The Fund will distribute to shareholders annually any net capital gains
which have been recognized for Federal income tax purposes including unrealized
gains at the end of the Fund's fiscal year on futures transactions. Such
distributions will be combined with distributions of capital gains realized on
the Fund's other investments and shareholders will be advised on the nature of
the payments.

                            PORTFOLIO TRANSACTIONS

     The investment advisory agreement authorizes the Adviser (with the approval
of the Fund's Board of Directors) to select the brokers or dealers that will
execute the purchases and sales of portfolio securities for the Fund and directs
the Adviser to use its best efforts to obtain the best available price and most
favorable execution as to all transactions for the Fund. The Adviser undertakes
to execute each investment transaction at a price and commission which provides
the most favorable total cost or proceeds reasonably obtainable under the
circumstances.

     In placing portfolio transactions, the Adviser will use its best judgment
to choose the broker most capable of providing the brokerage services necessary
to obtain best available price and most favorable execution. The full range and
quality of brokerage services available will be considered in making these
determinations. In those instances where it is reasonably determined that more
than one broker can offer the brokerage services needed to obtain the best
available price and most favorable execution, consideration may be given to
those brokers which supply investment research and statistical information and
provide other services in addition to execution services to the Fund and/or the
Adviser. The Adviser considers such information useful in the performance of its
obligations under the agreement, but is unable to determine the amount by which
such services may reduce its expenses.

     The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities Exchange Act of 1934 by providing that, subject to the
approval of the Fund's Board of Directors, the Adviser may cause the Fund to pay
a broker-dealer which furnishes brokerage and research services a higher
commission than that which might be charged by another broker-dealer for
effecting the same transaction; provided that such commission is deemed
reasonable in terms of either that particular transaction or the overall
responsibilities of the Adviser to the Fund.

     Currently, it is the Fund's policy that the Adviser may at times pay higher
commissions in recognition of brokerage services felt necessary for the
achievement of better execution of certain securities transactions that
otherwise might not be available. The Adviser will only pay such higher
commissions if it believes this to be in the best interest of the Fund. Some
brokers or dealers who may receive such higher commissions in recognition of
brokerage services related to execution of securities transactions are also
providers of research information to the Adviser and/or the Fund. However, the
Adviser has informed the Fund that it will not pay higher commission rates
specifically for the purpose of obtaining research services.

     Since the Fund does not market its shares through intermediary brokers or
dealers, it is not the Fund's practice to allocate brokerage or principal
business on the basis of sales of its shares which may be through such firms.
However, the Fund may place portfolio orders with qualified broker-dealers who
recommend the Fund to other clients, or who act as agent in the purchase of the
Fund's shares for their clients, and may, when a number of brokers and dealers
can provide comparable best price and execution on a particular transaction,
consider the sale of Fund shares by a broker or dealer in selecting among
qualified broker-dealers.

     The total brokerage commissions paid by the Fund for the fiscal years ended
September 30, 1995, September 30, 1996 and September 30, 1997, totaled
$92,177, $127,528 and $113,938 respectively.

     Some securities considered for investment by the Fund may also be
appropriate for other clients served by the Adviser. If purchases or sales of
securities consistent with the investment policies of the Fund and one or more
of these other clients serviced by the Adviser are considered at or about the
same time, transactions in such securities will be allocated among the Fund and
such other clients in a manner deemed equitable by the Adviser.



B-4


<PAGE>


Description of U.S. Government Securities

     As used in this prospectus, the term "U.S. Government Securities" refers to
a variety of securities which are issued or guaranteed by the United States
Treasury, by various agencies of the United States Government, and by various
instrumentalities which have been established or sponsored by the United States
Government. The term also refers to "repurchase agreements" collateralized by
such securities.

     U.S. Treasury Securities are backed by the "full faith and credit" of the
United States. Securities issued or guaranteed by Federal agencies and U.S.
Government sponsored instrumentalities may or may not be backed by the full
faith and credit of the United States. In the case of securities not backed by
the full faith and credit of the United States, the investor must look
principally to the agency or instrumentality issuing or guaranteeing the
obligation for ultimate repayment, and may not be able to assert a claim against
the United States itself in the event the agency or instrumentality does not
meet its commitment.

     Some of the U.S. Government agencies that issue or guarantee securities
include the Export-Import Bank of the United States, Farmers Home
Administration, Federal Housing Administration, Maritime Administration, Small
Business Administration, and The Tennessee Valley Authority.

     An instrumentality of the U.S. Government is a government agency organized
under Federal charter with government supervision. Instrumentalities issuing or
guaranteeing securities include, among others, Federal Home Loan Banks, the
Federal Land Banks, Central Bank for Cooperatives, Federal Intermediate Credit
Banks, and the Federal National Mortgage Association.

Description of Repurchase Agreements

     Repurchase agreements are transactions by which a person purchases a
security and simultaneously commits to resell that security to the seller (a
member bank of the Federal Reserve System or recognized securities dealer) at an
agreed upon price on an agreed upon date within a number of days (usually not
more than seven) from the date of purchase. The resale price reflects the
purchase price plus an agreed upon market rate of interest which is unrelated to
the coupon rate or maturity of the purchased security. A repurchase agreement
involves the obligation of the seller to pay the agreed upon price, which
obligation is in effect secured by the value of the underlying security.

     The use of repurchase agreements involves certain risks. For example, if
the seller of the agreement defaults on its obligation to repurchase the
underlying securities at a time when the value of these securities has declined,
the Portfolio may incur a loss upon disposition of them. If the seller of the
agreement becomes insolvent and subject to liquidation or reorganization under
the Bankruptcy Code or other laws, a bankruptcy court may determine that the
underlying securities are collateral not within the control of the Portfolio and
therefore subject to sale by the trustee in bankruptcy. Finally, it is possible
that the Portfolio may not be able to substantiate its interest in the
underlying securities. While the Fund's management acknowledges these risks, it
is expected that they can be controlled through stringent security selection
criteria and careful monitoring procedures.

                            INVESTMENT LIMITATIONS

     The following restrictions supplement the Fund's investment limitations set
forth in the Prospectus. Except as otherwise indicated, these restrictions are
fundamental policies of the Fund which cannot be changed without the approval of
a majority (as defined in the Investment Company Act of 1940 (the "1940 Act") of
the Fund's outstanding voting shares. The Fund may not under any circumstances:


                                                                             B-5

<PAGE>



     1) Borrow money, except from banks (or through reverse repurchase
        agreements) for temporary or emergency purposes (not leveraging), and
        then only in an amount not in excess of 15% of the value of the Fund's
        net assets at the time the borrowing is made. Whenever borrowing exceeds
        5% of the value of the Fund's assets, the Fund will not make any
        additional investments;
   
     2) With respect to 75% of the value of its total assets, purchase the
        securities of any issuer (except obligations of the United States
        government and its instrumentalities) if as a result the Fund would hold
        more than 10% of the outstanding voting securities of the issuer, or
        more than 5% of the value of the Fund's total assets would be invested
        in the securities of such issuer;
   
     3) Invest for the purpose of exercising control of management of any
        company;
   
     4) Purchase the securities of any other investment company, except as they
        may be acquired as part of a merger, consolidation or acquisition of
        assets or otherwise to the extent permitted by Section 12 of the 1940
        Act. The Fund will invest only in investment companies which have
        investment objectives consistent with those of the Fund;
   
     5) The Fund will not engage in the business of underwriting securities
        issued by other persons except to the extent that the Fund may
        technically be deemed to be an underwriter under the Securities Act of
        1933 in disposing of portfolio securities. Additionally, the Fund will
        not purchase or otherwise acquire any security if, as a result, more
        than 15% of its net assets would be invested in securities that are
        illiquid (included in this limitation is the Fund's investment in The
        Vanguard Group, Inc.);
   
     6) Invest in commodities, except that the Fund may invest in futures
        contracts, options and options on futures contracts to the extent that
        not more than 5% of the Fund's assets are required as margin deposit for
        futures contracts;
   
     7) Invest in real estate or real estate limited partnership interests
        although the Fund may purchase and sell securities of companies which
        invest in real estate, or interests therein;
   
     8) Purchase securities on margin or sell any securities short except as
        specified in investment limitation No. 6 above;
   
     9) Make loans except (i) by purchasing bonds, debentures or similar
        obligations (including repurchase agreements) which are either publicly
        distributed or customarily purchased by institutional investors, and
        (ii) by lending its securities to banks, brokers, dealers and other
        financial institutions so long as such loans are not inconsistent with
        the Investment Company Act or the Rules and Regulations or
        interpretations of the Securities and Exchange Commission thereunder. No
        loan of securities will be made if, as a result the aggregate of such
        loans in the Fund would exceed 33 1/3% of the value of the Fund's total
        assets;
  
    10) Pledge, mortgage, or hypothecate any of its assets to an extent greater
        than 5% of its total assets; and

    11) Invest more than 25% of the value of its total assets in any one
        industry.


     The investment limitations set forth above are considered at the time that
investment securities are purchased. If a percentage restriction is adhered to
at the time the investment is made, a later increase in percentage resulting
from a change in the market value of assets will not constitute a violation of
such restriction.


     Notwithstanding these limitations, the Fund may own all or any portion of
the securities of, or make loans to, or contribute to the costs or other
financial requirements of any company which will be wholly-owned by the Fund and
one or more other investment companies and is primarily engaged in the business
of providing, at-cost, management, administrative, distribution or related
services to the Fund and other investment companies. See "Management of the
Fund."


B-6

<PAGE>


   
                              PURCHASE OF SHARES

     The Fund reserves the right in its sole discretion (i) to suspend the
offerings of its shares, (ii) to reject purchase orders when in the judgment of
management such rejection is in the best interest of the Fund, and (iii) to
reduce or waive the minimum investment for or any other restrictions on initial
and subsequent investments for certain fiduciary accounts or under circumstances
where certain economies can be achieved in sales of the Fund's shares.
    


                             REDEMPTION OF SHARES

     The Fund may suspend redemption privileges or postpone the date of payment
(i) during any period that the New York Stock Exchange is closed, or trading on
the Exchange is restricted as determined by the Securities and Exchange
Commission (the "Commission"), (ii) during any period when an emergency exists
as defined by the rules of the Commission as a result of which it is not
reasonably practicable for the Fund to dispose of securities owned by it, or
fairly to determine the value of its assets, and (iii) for such other periods as
the Commission may permit.

     The Fund has made an election with the Commission to pay in cash all
redemptions requested by any shareholder of record limited in amount during any
90-day period to the lesser of $250,000 or 1% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part, in investment securities or in cash, as the Directors
may deem advisable; however, payment will be made wholly in cash unless the
Directors believe that economic or market conditions exist which would make such
a practice detrimental to the best interests of the Fund. If redemptions are
paid in investment securities, such securities will be valued as set forth in
the Prospectus under "The Fund's Share Price" and a redeeming shareholder would
normally incur brokerage expenses if he converted these securities to cash.

     No charge is made by the Fund for redemptions. Any redemption may be more
or less than the shareholder's cost depending on the market value of the
securities held by the Fund.


                                                                             B-7
<PAGE>

                            MANAGEMENT OF THE FUND


Directors and Officers

     The Officers of the Fund manage its day-to-day operations and are
responsible to the Fund's Board of Directors. The Directors set broad policies
for the Fund and choose its Officers. The following is a list of Directors and
Officers of the Fund and a statement of their present positions and principal
occupations during the past five years. The mailing address of the Directors and
Officers of the Fund is Post Office Box 876, Valley Forge, PA 19482.

   
JOHN C. BOGLE, (DOB: 5/8/1929) Chairman and Director*
 Chairman and Director of The Vanguard Group, Inc., and of each of the
 investment companies in The Vanguard Group; Director of the Mead
 Corporation, General Accident Insurance, and Chris-Craft Industries, Inc.


JOHN J. BRENNAN, (DOB: 7/29/1954) President, Chief Executive Officer & Director*
 President, Chief Executive Officer and Director of The Vanguard Group, Inc.,
 and of each of the investment companies in The Vanguard Group.


ROBERT E. CAWTHORN, (DOB: 9/28/1935) Director
 Chairman Emeritus and Director of Rhone-Poulenc Rorer, Inc; Managing Director
 of Global Health Care Partners/DLJ Merchant Banking Partners; Director of
 Sun Company, Inc., and Westinghouse Electric Corporation.

BARBARA BARNES HAUPTFUHRER, (DOB: 10/11/1928) Director
 Director of The Great Atlantic and Pacific Tea Company, IKON Office Solutions,
 Inc., Raytheon Company, Knight-Ridder, Inc., Massachusetts Mutual Life
 Insurance Co., and Ladies Professional Golf Association; Trustee Emerita of
 Wellesley College.


BRUCE K. MACLAURY, (DOB: 5/7/1931) Director
 President Emeritus of The Brookings Institution; Director of American Express
 Bank Ltd., The St. Paul Companies, Inc., and National Steel Corporation.


BURTON G. MALKIEL, (DOB: 8/28/1932) Director
 Chemical Bank Chairman's Professor of Economics, Princeton University;
 Director of Prudential Insurance Co. of America, Amdahl Corporation, Baker
 Fentress & Co., The Jeffrey Co., and Southern New England
 Telecommunications Company.
    
<PAGE>
   
ALFRED M. RANKIN, Jr., (DOB: 10/8/1941) Director
 Chairman, President, Chief Executive Officer, and Director of NACCO
 Industries, Inc.; Director of The BFGoodrich Company, and The Standard
 Products Company.

JOHN C. SAWHILL, (DOB: 6/12/1936) Director
 President and Chief Executive Officer of The Nature Conservancy; formerly,
 Director and Senior Partner of McKinsey & Co., and President of New York
 University; Director of Pacific Gas and Electric Company, Procter & Gamble
 Company, and NACCO Industries.

JAMES O. WELCH, JR., (DOB: 5/13/1931) Director
 Retired Chairman of Nabisco Brands, Inc.; retired Vice Chairman and Director of
 RJR Nabisco; Director of TECO Energy, Inc., and Kmart Corporation.

J. LAWRENCE WILSON, (DOB: 3/2/1936) Director
 Chairman and Chief Executive Officer of Rohm & Haas Company; Director of
 Cummins Engine Company, and The Mead Corporation; and Trustee of
 Vanderbilt University.

RAYMOND J. KLAPINSKY, (DOB: 12/7/1938) Secretary*
 Managing Director and Secretary of The Vanguard Group, Inc.; Secretary of each
 of the investment companies in The Vanguard Group.

RICHARD F. HYLAND, (DOB: 3/22/1937) Treasurer*
 Treasurer of The Vanguard Group, Inc., and of each of the investment companies
 in The Vanguard Group.

KAREN E. WEST, (DOB: 9/13/1946) Controller*
 Principal of The Vanguard Group, Inc.; Controller of each of the investment
 companies in The Vanguard Group.
    
- ------------------------
   *  Officers of the Fund are "interested persons" as defined in the Investment
      Company Act of 1940.



B-8

<PAGE>



     The Fund is a member of The Vanguard Group of Investment Companies. Through
their jointly-owned subsidiary, The Vanguard Group, Inc. ("Vanguard"), the Fund
and the other Funds in the Group obtain at cost virtually all of their corporate
management, administrative and distribution services. Vanguard also provides
investment advisory services on an at-cost basis to certain of the Vanguard
Funds.

     Vanguard employs a supporting staff of management and administrative
personnel needed to provide the requisite services to the Funds and also
furnishes the Funds with necessary office space, furnishings and equipment. Each
Fund pays its share of Vanguard's total expenses which are allocated among the
Funds under methods approved by the Board of Directors (Trustees) of each Fund.
In addition, each Fund bears its own direct expenses such as legal, auditing and
custodian fees.

     The Fund's officers are also officers and employees of Vanguard. No officer
or employee owns, or is permitted to own, any securities of any external adviser
for the Funds.

     The Vanguard Group adheres to a Code of Ethics established pursuant to Rule
17j-1 under the Investment Company Act of 1940. The Code is designed to prevent
unlawful practices in connection with the purchase or sale of securities by
persons associated with Vanguard. Under Vanguard's Code of Ethics certain
officers and employees of Vanguard who are considered access persons are
permitted to engage in personal securities transactions. However, such
transactions are subject to procedures and guidelines substantially similar to
those recommended by the mutual fund industry and approved by the U.S.
Securities and Exchange Commission.


     The Vanguard Group was established and operates under a Funds' Service
Agreement which was approved by the shareholders of each of the Funds. The
amounts which each of the Funds have invested are adjusted from time to time in
order to maintain the proportionate relationship between each Fund's relative
net assets and its contribution to Vanguard's capital. The Fund's Service
Agreement provides that: (a) each Vanguard Fund may invest up to .40% of its
current assets in Vanguard, and (b) there is no limit on the amount that each
Vanguard Fund may contribute to Vanguard's capitalization. At September 30,
1997, the Fund had contributed capital of $251,000, representing 1.3% of
Vanguard's capitalization. 



Management


     Corporate management and administrative services include: (1) executive
staff; (2) accounting and financial; (3) legal and regulatory; (4) shareholder
account maintenance; (5) monitoring and control of custodian relationships; (6)
shareholder reporting; and (7) review and evaluation of advisory and other
services provided to the Funds by third parties. During the fiscal year ended
September 30, 1997, the Fund's allocated share of Vanguard's actual net costs of
operations relating to management and administrative services (including
transfer agency) totaled approximately $10,632,000.


Distribution

     Vanguard provides all distribution and marketing activities for the Funds
in the Group. Vanguard Marketing Corporation, a wholly-owned subsidiary of
Vanguard, acts as Sales Agent for the shares of the Funds in connection with any
sales made directly to investors in the states of Florida, Missouri, New York,
Ohio, Texas and such other states as it may be required.


     The principal distribution expenses are for advertising, promotional
materials and marketing personnel. Distribution services may also include
organizing and offering to the public, from time to time, one or more new
investment companies which will become members of the Group. The Directors and
Officers of Vanguard determine the amount to be spent annually on distribution
activities, the manner and amount to be spent on each Fund, and whether to
organize new investment companies.


                                                                             B-9

<PAGE>


     One-half of the distribution expenses of a marketing and promotional nature
is allocated among the Funds based upon relative net assets. The remaining
one-half of those expenses is allocated among the Funds based upon each Fund's
sales for the preceding 24 months relative to the total sales of the Funds as a
Group, provided, however, that no Fund's aggregate quarterly rate of
contribution for distribution expenses of a marketing and promotional nature
shall exceed 125% of average distribution expense rate for the Group, and that
no Fund shall incur annual distribution expenses in excess of 20/100 of 1% of
its average month-end net assets. During the fiscal year ended September 30,
1997, the Fund paid approximately $683,000 of the Group's distribution and
marketing expenses, which represented an effective annual rate of .02 of 1% of
the Fund's average net assets.



Investment Advisory Services

     Vanguard provides investment advisory services to Vanguard Money Market
Reserves, Vanguard Municipal Bond Fund, several Portfolios of Vanguard Fixed
Income Securities Fund, Vanguard California Tax-Free Fund, Vanguard Florida
Insured Tax-Free Fund, Vanguard New Jersey Tax-Free Fund, Vanguard New York
Tax-Free Fund, Vanguard Pennsylvania Tax-Free Fund, Vanguard Ohio Tax-Free Fund,
Vanguard Admiral Funds, Vanguard Tax-Managed Fund, Vanguard Balanced Index Fund,
Vanguard Bond Index Fund, Vanguard Index Trust, Vanguard International Equity
Index Fund, Total International Portfolio of Vanguard STAR Fund, Aggressive
Growth Portfolio of Vanguard Horizon Fund, several Portfolios of Vanguard
Variable Insurance Fund, a portion of Vanguard/Windsor II, Vanguard
Institutional Index Fund, Vanguard REIT Index Portfolio of Vanguard Specialized
Portfolios, and a portion of Vanguard/Morgan Growth Fund as well as several
indexed separate accounts. These services are provided on an at-cost basis from
a money management staff employed directly by Vanguard. The compensation and
other expenses of this staff are paid by the Funds utilizing these services.




Remuneration of Directors and Officers

     The Fund pays each Director who is not also an Officer, an annual fee plus
travel and other expenses incurred in attending Board meetings. The Fund's
Officers and employees are paid by Vanguard which, in turn, is reimbursed by the
Fund, and each other Fund in the Group, for its proportionate share of Officers'
and employees' salaries and retirement benefits. During the year ended September
30, 1997 the Fund's proportionate share of remuneration paid to all Officers of
the Fund, as a group, was approximately $72,216 including Directors.

     Retired Directors who are not officers are paid an annual fee based on the
number of years of service. The fee is equal to $1,000 for each year of service
and each investment company member of The Vanguard Group contributes a
proportionate amount to this fee based on its relative net assets. Under its
retirement plan, Vanguard contributes annually an amount equal to 10% of each
eligible officer's annual compensation plus 5.7% of that part of an eligible
officer's compensation during the year, if any, that exceeds the Social Security
Taxable Wage Base then in effect. Under its thrift plan, all eligible officers
are permitted to make pre-tax contributions in an amount up to 4% of total
compensation, subject to federal tax limitations, which are matched by Vanguard
on a 100% basis. The Fund's proportionate share of retirement contributions made
by Vanguard under its retirement and thrift plans on behalf of all Officers of
the Fund, as a group, during the 1997 fiscal year was approximately $1,950.


B-10


<PAGE>



     The following table provides detailed information with respect to the
amounts paid or accrued for the Directors for the fiscal year ended September
30, 1997.



                        VANGUARD ASSET ALLOCATION FUND
                              COMPENSATION TABLE



   
<TABLE>
<CAPTION>
                                              Pension or Retirement       Estimated
                               Aggregate       Benefits Accrued as     Annual Benefits      Total Compensation
                              Compensation        Part of Fund              Upon          From All Vanguard Funds
Names of Directors             From Fund            Expenses             Retirement        Paid to Directors(2)
- ------------------           --------------  -----------------------  -----------------  ------------------------
<S>                           <C>             <C>                      <C>                <C>
John C. Bogle(1)                   --                  --                      --                    --
John J. Brennan(1)                 --                  --                      --                    --
Barbara Barnes Hauptfuhrer        $807                $116                 $15,000               $70,000
Robert E. Cawthorn                $807                $ 97                 $13,000               $70,000
Bruce K. MacLaury                 $861                $112                 $12,000               $65,000
Burton G. Malkiel                 $812                $ 78                 $15,000               $70,000
Alfred M. Rankin, Jr.             $807                $ 61                 $15,000               $70,000
John C. Sawhill                   $807                $ 73                 $15,000               $70,000
James O. Welch, Jr.               $807                $ 90                 $15,000               $70,000
J. Lawrence Wilson                $807                $ 65                 $15,000               $70,000
</TABLE>                                       
    

- ------------
(1) As "Interested Directors," Messrs. Bogle and Brennan receive no
    compensation for their service as Directors.

(2) The amounts reported in this column reflect the total compensation paid to
    each Director for their service as Director or Trustee of 35 Vanguard Funds
    (34 in the case of Mr. Malkiel; 28 in the case of Mr. MacLaury).



                             PERFORMANCE MEASURES


     Vanguard may use reprinted material discussing The Vanguard Group, Inc. or
any of the member funds of The Vanguard Group of Investment Companies.

     Each of the investment company members of The Vanguard Group, including
Vanguard Asset Allocation Fund, may, from time to time, use one or more of the
following unmanaged indices for comparative performance purposes.


Standard & Poor's 500 Composite Stock Price Index -- is a well diversified list
of 500 companies representing the U.S. Stock Market.

Standard & Poor's MidCap 400 Index -- is composed of 400 medium sized domestic
stocks.


Standard & Poor's/BARRA 600 Value Index -- contains stocks of the S&P SmallCap
600 Index which have a lower than average price-to-book ratio.


Standard & Poor's/BARRA 600 Growth Index -- contains stocks of the S&P SmallCap
600 Index which have a higher than average price-to-book ratio.


Russell 1000 Value Index -- consists of the stocks in the Russell 1000 Index
(comprising the 1,000 largest U.S.-based companies measured by total market
capitalization) with the lowest price-to-book ratios, comprising 50% of the
market capitalization of the Russell 1000.




Wilshire 5000 Equity Index -- consists of nearly 7,000 common equity securities,
covering all stocks in the U.S. for which daily pricing is available.


Wilshire 4500 Equity Index -- consists of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard and Poor's 500 Index.


                                                                            B-11

<PAGE>


   
Morgan Stanley Capital International EAFE Index -- is an arithmetic, market
value-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia, Asia and the Far East.
    

Goldman Sachs 100 Convertible Bond Index -- currently includes 71 bonds and 29
preferreds. The original list of names was generated by screening for
convertible issues of $100 million or greater in market capitalization. The
index is priced monthly.

Salomon Brothers GNMA Index -- includes pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.

Salomon Brothers High-Grade Corporate Bond Index -- consists of publicly issued,
non-convertible corporate bonds rated AA or AAA. It is a value-weighted, total
return index, including approximately 800 issues with maturities of 12 years or
greater.

Lehman Brothers Aggregate Bond Index -- is a market weighted index that contains
over 4,000 individually priced U.S. Treasury, agency, corporate, and mortgage
pass-through securities corporate rated BBB - or better. The Index has a market
value of over $4 trillion.


Lehman Brothers Mutual Fund Short (1-5) Government/Corporate Index -- is a
market weighted index that contains over 1,500 individually priced U.S.
Treasury, agency, and corporate investment grade bonds rated BBB - or better
with maturities between 1 and 5 years. The index has a market value of over $1.6
trillion.

Lehman Brothers Mutual Fund Intermediate (5-10) Government/Corporate Index -- is
a market weighted index that contains over 1,500 individually priced U.S.
Treasury, agency, and corporate securities rated BBB - or better with maturities
between 5 and 10 years. The index has a market value of over $700 billion. 

Lehman Brothers Mutual Fund Long (10+) Government/Corporate Index -- is a market
weighted index that contains over 1,900 individually priced U.S. Treasury,
agency, and corporate securities rated BBB - or better with maturities greater
than 10 years. The index has a market value of over $900 billion.


Lehman Long-Term Treasury Bond Index -- is composed of all bonds covered by the
Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.

Merrill Lynch Corporate & Government Bond Index -- consists of over 4,500 U.S.
Treasury, Agency and investment grade corporate bonds.


Lehman Corporate (Baa) Bond Index -- all publicly offered fixed rate,
nonconvertible domestic corporate bonds rated Baa by Moody's, with a maturity
longer than 1 year and with more than $25 million outstanding. This index
includes over 1,000 issues.

Lehman Brothers Long-Term Corporate Bond Index -- is a subset of the Lehman
Corporate Bond Index covering all corporate, publicly issued, fixed-rate,
nonconvertible U.S. debt issues rated at least Baa, with at least $50 million
principal outstanding and maturity greater than 10 years.


Bond Buyer Municipal Bond Index -- is a yield index on current coupon high grade
general obligation municipal bonds.


Standard & Poor's Preferred Index -- is a yield index based upon the average
yield of four high grade, noncallable preferred stock issues.

NASDAQ Industrial Index -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.


B-12

<PAGE>


Composite Index -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.

Composite Index -- 65% Standard & Poor's 500 Index and 35% Lehman Long-Term
Corporate AA or Better Bond Index.


Composite Index -- 65% Lehman Long-Term Corporate AA or Better Bond Index and a
35% weighting in a blended equity composite (75% Standard & Poor's/BARRA Value
Index, 12.5% Standard & Poor's Utilities Index and 12.5% Standard & Poor's
Telephone Index).


Lehman Long-Term Corporate AA or Better Bond Index -- consists of all publicly
issued, fixed rate, nonconvertible investment grade, dollar-denominated,
SEC-registered corporate debt rated AA or AAA.


                                 TOTAL RETURN


     The average annual total return for the Fund for one and five years ended
September 30, 1997 and for the period from inception (November 3, 1988) to
September 30, 1997 was +29.42%, +16.74% and +15.69%, respectively.


     Total return is computed by determining the average compounded rates of
return over the periods set forth above that would equate an initial amount
invested at the beginning of the periods to the ending redeemable value of the
investment.


                         INVESTMENT ADVISORY SERVICES


     The Fund employs Mellon Capital Management Corporation ("MCM"), 595 Market
St., Suite 3000, San Francisco, California (the "Adviser") under an investment
advisory agreement dated as of July 1, 1997 to manage the investment and
reinvestment of the assets of the Fund and to continuously review, supervise and
administer the Fund's investment program. The Adviser discharges its
responsibilities subject to the control of the Officers and Directors of the
Fund. 

     The Fund pays the Adviser a Basic fee at the end of each fiscal quarter,
calculated by applying a quarterly rate, based on the following annual
percentage rates, to the Fund's average month-end net assets for the quarter:



        
        Net Assets                                         Rate   
        ----------                                        ------
        First $100 million  ...........................   .200%
        Next $900 million   ...........................   .150%
        Next $500 million   ...........................   .125%
        Over $1.5 billion   ...........................   .100%



     This fee may be increased or decreased by applying an adjustment formula
based on the performance of the Fund's portfolio relative to the investment
record of a "Combined Index", 65% of which shall be comprised of the Standard &
Poor's 500 Composite Price Index and 35% of which shall be comprised of the
Lehman Brothers Long-Term U.S. Treasury Index. The fee payment will be increased
(decreased) by an incentive (penalty) of 0.05% of average net assets, if the
Fund's cumulative investment performance for the thirty-six months preceding the
end of the quarter is at least six percentage points above (below) the
cumulative investment record of the S&P 500 Index for the same period. For the
purpose of determining the fee adjustment for investment performance, as
described above, the net assets of the Fund will be averaged over the same
period as the performance of the Fund and the investment record of the Combined
Index are computed.



                                                                            B-13

<PAGE>



     Under the rules of the Securities and Exchange Commission, the new
incentive/penalty fee will not be fully operable until the quarter ending March
31, 2000. Until that date, a "blended" fee rate consisting of varying
percentages of (i) the performance adjustment based on the schedule set forth
above (the "New Rate"1), and (ii) the performance adjustment based on the
schedule set forth in the Fund's previous investment advisory agreement with the
adviser2 (the "Previous Rate") shall be used as follows:

     1. Quarter Ending June 30, 1997. The incentive/penalty fee was calculated
as the sum of 8.3% (e.g., one of 12 quarters) of the fee payable under the New
Rate plus 91.7% (e.g., 11 of 12 quarters) of the fee payable under the Previous
Rate.

     2. Quarter Ending September 30, 1997. The incentive/penalty fee was
calculated as the sum of 16.6% of the fee payable under the New Rate plus 83.4%
of the fee payable under the Previous Rate.

     3. Quarter Ending December 31, 1997. The incentive/penalty fee was
calculated as the sum of 25% of the fee payable under the New Rate plus 75% of
the fee payable under the Previous Rate.

     4. Quarter Ending March 31, 1998. The incentive/penalty fee shall be
calculated as the sum of 33.3% of the fee payable under the New Rate plus 66.7%
of the fee payable under the Previous Rate.

     5. Quarter Ending June 30, 1998. The incentive/penalty fee shall be
calculated as the sum of 41.6% of the fee payable under the New Rate plus 58.4%
of the fee payable under the Previous Rate.

     6. Quarter Ending September 30, 1998. The incentive/penalty fee shall be
calculated as the sum of 50% of the fee payable under the New Rate plus 50% of
the fee payable under the Previous Rate.

     7. Quarter Ending December 31, 1998. The incentive/penalty fee shall be
calculated as the sum of 58.4% of the fee payable under the New Rate plus 41.6%
of the fee payable under the Previous Rate.

     8. Quarter Ending March 31, 1999. The incentive/penalty fee shall be
calculated as the sum of 66.7% of the fee payable under the New Rate plus 33.3%
of the fee payable under the Previous Rate.

     9. Quarter Ending June 30, 1999. The incentive/penalty fee shall be
calculated as the sum of 75% of the fee payable under the New Rate plus 25% of
the fee payable under the Previous Rate.

     10. Quarter Ending September 30, 1999. The incentive/penalty fee shall be
calculated as the sum of 83.4% of the fee payable under the New Rate plus 16.6%
of the fee payable under the Previous Rate.

     11. Quarter Ending December 31, 1999. The incentive/penalty fee shall be
calculated as the sum of 91.7% of the fee payable under the New Rate plus 8.3%
of the fee payable under the Previous Rate.

     12. Quarter Ending March 31, 2000. New Rate fully operable.

     For the purpose of determining the fee adjustment for investment
performance, as described above, the net assets of the Fund shall be averaged
over the same period as the investment performance of the Fund and the
investment record of the Combined Index are computed. The "investment
performance" of the Fund


- ------------

1 The benchmark used for the new rate calculation will consist of linking the
  return of the "new" benchmark (a "Combined Index", 65% of which is comprised
  of the Standard & Poor's 500 Composite Price Index and 35% of which is
  comprised of the Lehman Brothers Long-Term U.S. Treasury Index) to the return
  of the "previous" benchmark (Standard & Poor's 500 Composite Price Index) in
  the same varying percentages that are listed below.
2 The previous incentive/penalty fee structure provided that the Basic Fee be
  increased or decreased by an amount equal to .05% of the average month-end
  assets of the Fund if the Fund's investment performance for the thirty-six
  months preceding the end of the quarter was six percentage points or more
  above or below, respectively, the investment record of the Standard & Poor's
  500 Composite Price Index.



B-14


<PAGE>


for the period, expressed as a percentage of the Fund's net asset value per
share at the beginning of the period shall be the sum of: (i) the change in the
Fund's net asset value per share during such period; (ii) the value of the
Fund's cash distributions per share having an ex-dividend date occurring within
the period; and (iii) the per share amount of capital gains taxes paid or
accrued during such period by the Fund for undistributed realized long-term
capital gains.

     The "investment record" of the Stock Index for the period, expressed as a
percentage of the Stock Index level at the beginning of the period, shall be the
sum of (i) the change in the level of the Stock Index during the period and (ii)
the value, computed consistently with the Stock Index, of cash distributions
having an ex-dividend date occurring within the period made by companies whose
securities comprise the Stock Index. The "investment record" of the Bond Index
for the period, expressed as a percentage of the Bond Index level at the
beginning of such period shall be the sum of (i) the change in the level of the
Bond Index during the period and (ii) the value of the interest accrued or paid
on the bonds included in the Bond Index, assuming the reinvestment of such
interest on a monthly basis. Computation of these two components as the Combined
Index shall be made on the basis of 65% in the Stock Index and 35% in the Bond
Index at the beginning of each quarter.

     The agreement will continue until June 30, 1998 and will be renewable
thereafter for successive one-year periods, only if each renewal is specifically
approved by a vote of the Fund's Board of Directors, including the affirmative
votes of a majority of the Directors who are not parties to the contract or
"interested persons" (as defined in the Investment Company Act of 1940) of any
such party, cast in person at a meeting called for the purpose of considering
such approval. In addition, the question of continuance shall be effected only
if approved by the affirmative vote of a majority of the outstanding voting
securities of the Fund. The agreement is automatically terminated if assigned,
and may be terminated without penalty at any time (1) either by vote of the
Board of Directors of the Fund or by vote of its outstanding voting securities
on 60 days' written notice to the Adviser, or (2) by the Adviser upon 90 days'
written notice to the Fund.


     The Fund's Board of Directors may, without the approval of shareholders,
provide for:

     A. The employment of a new investment adviser pursuant to the terms of a
new advisory agreement, either as a replacement for an existing adviser or as an
additional adviser.

     B. A change in the terms of an advisory agreement.


     C. The continued employment of an existing adviser on the same advisory
contract terms where a contract has been assigned because of a change in control
of the adviser.


     Any such change will only be made upon not less than 30 days' prior written
notice to shareholders, which shall include the information concerning the
adviser that would have normally been included in a proxy statement.


     Because the Adviser provides only investment advisory services to the Fund
and has no control over the Fund's expenses, the Adviser has not undertaken to
guarantee expenses of the Fund. The Officers of the Fund have worked out
alternative arrangements with state authorities which do require an expense
guarantee.



     Description of the Adviser. The Adviser is a professional counseling firm
which manages well diversified stock and bond portfolios for institutional
clients. As of September 30, 1997 the Adviser provided investment advisory
services to 227 clients and managed assets with an approximate value of $64.9
billion. The Adviser's asset allocation strategy was developed by the Adviser's
co-founder, William Fouse, in 1972, and is used by 109 of its clients and
accounts for approximately $20.2 billion of the assets that it manages. The
Adviser is a wholly-owned subsidiary of MBC Investment Corporation, which itself
is a wholly-owned subsidiary of Mellon Bank Corporation. For the fiscal years
ended September 30, 1995, September 30, 1996



                                                                            B-15
<PAGE>




and September 30, 1997, the Fund paid approximately $1,954,000 (before a
decrease of $131,000 based on performance), $2,691,000 (before a decrease of
$515,000 based on performance), and $3,723,000 (before a decrease of $921,000
based on performance) respectively, to the Adviser for investment advisory
services. The basic fee paid to the Adviser for the fiscal year ended September
30, 1996 reflects a fee waiver of $146,000 during the period October 1, 1995 to
March 31, 1996. 



                                   Glossary

a. Historical Market Returns -- Total returns of broad asset class benchmarks.
   As examples, the returns of well-known benchmarks for domestic stocks, bonds,
   and money market instruments are given below.





<TABLE>
<CAPTION>
                                                                         Money Market
    Asset Class          Common Stocks               Bonds                Instruments
                       Standard & Poor's
                      500 Composite Stock       Lehman Brothers             90 Day
     Benchmark            Price Index         Long Treasury Index     U.S. Treasury Bills
    ----------        -------------------     -------------------     -------------------
<S>                   <C>                     <C>                     <C>   
       1980               32.4                      -2.9                    11.4
       1981               -4.9                       0.4                    14.7
       1982               21.5                      41.8                    10.9
       1983               22.5                       2.0                     9.0
       1984                6.2                      14.8                    10.0
       1985               31.6                      31.6                     7.8
       1986               18.6                      24.1                     6.2
       1987                5.2                      -2.7                     5.9
       1988               16.5                       9.2                     6.8
       1989               31.6                      18.9                     8.6
       1990               -3.1                       6.3                     7.9
       1991               30.4                      18.5                     5.8
       1992                7.6                       8.0                     3.6
       1993               10.1                      17.3                     3.1
       1994                1.3                      -7.6                     4.2
       1995               37.6                      30.7                     5.8
       1996               23.0                      -0.9                     5.2
       1997(9/30)         29.6                       8.1                     3.9
</TABLE>                                         
                                         

b. Asset Allocation -- Asset allocation -- in its most generic sense -- is the
   allotment of an investor's monies to broad asset classes such as stocks or
   bonds. Investors establish percentage allocation guidelines for stocks,
   bonds, and money market instruments which are consistent with their
   particular long-term investment needs. These needs will include current
   income, potential growth in capital, and willingness to accept risk.

     In implementing their asset allocation targets, some investors attempt to
maintain a stable mix -- such as 50% stocks and 50% bonds -- while others will
actively manage the stock/bond mix in pursuit of higher returns, lower risk, or
other investment objectives. The key difference between investors who maintain a
stable mix and those who actively change allocations is their willingness to
forecast the risks and returns of individual asset classes, their forecasting
abilities, and their comfort in making investment decisions based upon such
forecasts. Historically, investors who actively managed the mix based upon
conjecture have often underperformed both investors with relatively stable
allocations and investors with logical, disciplined methods for assessing
relative value and risk. Institutional investors commonly refer to active asset
allocation approaches which are based upon disciplined methodologies as tactical
asset allocation.


B-16



<PAGE>


                             FINANCIAL STATEMENTS


     The Fund's financial statements, including the financial highlights for
each of the five fiscal years in the period ended September 30, 1997, appearing
in the Fund's 1997 Annual Report to Shareholders and the report thereon of Price
Waterhouse LLP, independent accountants, also appearing therein, are
incorporated by reference into this Statement of Additional Information. The
Fund's 1997 Annual Report to Shareholders is enclosed with this Statement of
Additional Information. 


                                                                            B-17





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