VANGUARD STAR FUND
485BPOS, 1999-04-29
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<PAGE>
 
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                      SECURITIES AND EXCHANGE COMMISSION
 
                            Washington, D.C. 20549
 
                                   Form N-1A
 
                  REGISTRATION STATEMENT (NO. 2-88373) UNDER
                          THE SECURITIES ACT OF 1933
 
                         Pre-Effective Amendment No.                        [X]
                                                     
                     Post-Effective Amendment No. 23                        [X]
                                                                                
                                      and
 
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
                                              
                             Amendment No. 25                               [X]
                                                                                
                              VANGUARD STAR FUNDS
        (Exact Name of Registrant as Specified in Declaration of Trust)
 
                                P.O. Box 2600,
                            Valley Forge, PA 19482
                    (Address of Principal Executive Office)
 
                 Registrant's Telephone Number (610) 669-1000
 
                          R. Gregory Barton, Esquire
                                 P.O. Box 876
                            Valley Forge, PA 19482
   
  It is requested that this filing become effective on April 30, 1999 pursuant
to paragraph (b) of Rule 485.     
 
  Approximate Date of Proposed Public Offering: As soon as practicable after
this Registration Statement becomes effective.
   
  We have elected to register an indefinite number of shares pursuant to
Regulation 24f-2 under the Investment Company Act of 1940. We filed our Rule
24f-2 Notice for the year ended December 31, 1998 on March 29, 1999.     
 
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<PAGE>
 
                               VANGUARD STAR FUND
 
                             CROSS REFERENCE SHEET
 
<TABLE>   
<CAPTION>
  Form N-1A
 Item Number                                        Location in Prospectus
 <C>         <C>                                    <S>
  Item 1.    Front and Back Cover Pages............ Front and Back Cover Pages
  Item 2.    Risk/Return Summary: Investments,
             Risks, and Performance................ Fund Profile
  Item 3.    Risk/Return Summary: Fee Table........ Fee Table
  Item 4.    Investment Objectives, Principal
             Investment Strategies, and Related     A Word About Risk; Who
             Risks................................. Should Invest; Primary
                                                    Investment Strategies;
                                                    More on the Funds
  Item 5.    Management's Discussion of Fund
             Performance........................... Herein incorporated by
                                                    reference to Registrant's
                                                    Annual Report to
                                                    Shareholders dated
                                                    December 31, 1998 filed
                                                    with the Securities &
                                                    Exchange Commission's
                                                    EDGAR system on February
                                                    24, 1999
  Item 6.    Management, Organization and Capital
             Structure............................. The Funds and Vanguard;
                                                    Investment Adviser
  Item 7.    Shareholder Information............... Share Price; Dividends,
                                                    Capital Gains, and Taxes;
                                                    Investing with Vanguard
  Item 8.    Distribution Arrangements............. Not Applicable
  Item 9.    Financial Highlights Information...... Financial Highlights
<CAPTION>
  Form N-1A                                         Location in Statement
 Item Number                                        of Additional Information
 <C>         <C>                                    <S>
  Item 10.   Cover Page and Table of Contents...... Cover Page; Table of
                                                    Contents
  Item 11.   Fund History.......................... Description of the Trust
  Item 12.   Description of the Fund and its
             Investments and Risks................. Investment Policies;
                                                    Description of the Trust;
                                                    Fundamental Investment
                                                    Limitations
  Item 13.   Management of the Fund................ Management of the Trust
  Item 14.   Control Persons and Principal Holders
             of Securities......................... Management of the Trust
  Item 15.   Investment Advisory and Other          Management of the Trust;
             Services.............................. Investment Advisory
                                                    Services
  Item 16.   Brokerage Allocation and Other         Portfolio Transactions
             Practices.............................
  Item 17.   Capital Stock and Other Securities.... Description of the Trust
  Item 18.   Purchase, Redemption and Pricing of
             Shares................................ Purchase of Shares;
                                                    Redemption of Shares;
                                                    Share Price
  Item 19.   Taxation of the Fund.................. Description of the Trust
  Item 20.   Underwriters.......................... Not Applicable
  Item 21.   Calculation of Performance Data ...... Yield and Total Return
  Item 22.   Financial Statements.................. Financial Statements
</TABLE>    
<PAGE>
 
Vanguard STAR Fund

Prospectus April 30, 1999

A Balanced Mutual Fund

Contents

1  Fund Profile                              14 Financial Highlights
                                             
3  Additional Information                    15 Investing with Vanguard
                                             
3  A Word About Risk                         15 Services and Account Features
                                             
3  Who Should Invest                         16 Types of Accounts
                                             
4  Primary Investment Strategies             16 Buying Shares
                                             
9  The Fund and Vanguard                     18 Redeeming Shares
                                             
10 Investment Adviser                        21 Transferring Registration
                                             
12 Year 2000 Challenge                       21 Fund and Account Updates
                                             
12 Dividends, Capital Gains, and Taxes       Glossary (inside back cover)
                                                      
13 Share Price

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Why Reading This Prospectus Is Important

This prospectus explains the objective, risks, and strategies of Vanguard STAR
Fund. To highlight terms and concepts important to mutual fund investors, we
have provided "Plain Talk(R)" explanations along the way. Reading the prospectus
will help you to decide whether the Fund is the right investment for you. We
suggest that you keep it for future reference.
- --------------------------------------------------------------------------------



Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.



                                      28
<PAGE>
 
                                                                               1

Fund Profile

The following profile summarizes key features of Vanguard STAR Fund.

INVESTMENT OBJECTIVE

The Fund is a balanced fund that seeks to provide long-term capital growth and
some income.

INVESTMENT STRATEGIES

As a "fund of funds," STAR Fund invests in a diversified group of nine other
Vanguard mutual funds, rather than in individual securities. The Fund follows a
balanced investment approach by placing 60% to 70% of its assets in six stock
funds; 20% to 30% of its assets in two bond funds; and 10% to 20% of its assets
in one money market fund.

PRIMARY RISKS
    
The Fund's total return, like the prices of stocks and bonds generally, will
fluctuate within a wide range, so an investor could lose money over short or
even long periods. The Fund is also subject to:      
    
 . Investment-style risk, which is the chance that returns from the stock market
  segments in which the Fund is most heavily weighted (large-cap and value
  stocks) may underperform other asset classes or the overall stock market. Each
  market segment tends to go through cycles of doing better--or worse--than the
  stock market in general. These periods have, in the past, lasted for as long
  as several years.      

 . Manager risk, which is the chance that poor security selection by the
  investment advisers of the underlying funds will cause the Fund to
  underperform other funds with similar investment objectives.

 . Interest rate risk, which is the chance that bond prices overall will decline
  over short or even long periods due to rising interest rates.
    
 . Call/Prepayment risk, which is the chance that during periods of falling
  interest rates, a bond issuer will repay a higher-yielding bond before its
  maturity date. Forced to reinvest the unanticipated proceeds at lower interest
  rates, the Fund would experience a decline in income.

 . Credit risk, which is the chance that a bond issuer will fail to pay interest
  and principal in a timely manner, reducing the Fund's return. Credit risk
  should be low for the Fund.
     
PERFORMANCE/RISK INFORMATION
    
The bar chart and table below provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year over
a ten-year period. The table shows how the Fund's average annual returns for
one, five, and ten calendar years compare with those of a broad-based securities
market index and a composite stock/bond index weighted to match the Fund's
target allocation. Keep in mind that the Fund's past performance does not
indicate how it will perform in the future.

     -------------------------------------------------------------------- 
                             Annual Total Returns
     -------------------------------------------------------------------- 

                           [BAR CHART APPEARS HERE]

                1989                                    18.80%
                1990                                    -3.62%
                1991                                    24.18%
                1992                                    10.51%
                1993                                    10.88%
                1994                                    -0.21%
                1995                                    28.64%
                1996                                    16.11%
                1997                                    21.15%
                1998                                    12.38%

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


  During the period shown in the bar chart, the highest return for a calendar
quarter was 12.30% (quarter ended March 31, 1991) and the lowest return for a
quarter was -10.71% (quarter ended September 30, 1990).
     
<PAGE>
 
2
    
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         Average Annual Total Returns for Years Ended December 31, 1998
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                                        1 Year     5 Years    10 Years
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Vanguard STAR Fund                      12.38%      15.20%     13.46%
STAR Lipper Composite*                  11.30       12.69      12.33
Wilshire 5000 Index                     23.39       21.78      18.10
Lehman Brothers Aggregate Bond Index     8.69        7.27       9.26
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*Weighted 62.5% Lipper General Equity, 25% Lipper Fixed Income, and 12.5% Lipper
Money Market.
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                               PLAIN TALK ABOUT

                            The Costs of Investing

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with the fund's buying and selling of securities. These costs
can erode a substantial portion of the gross income or capital appreciation a
fund achieves. Even seemingly small differences in expenses can, over time, have
a dramatic effect on a fund's performance.

FEES AND EXPENSES

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment)
Sales Charge (Load) Imposed on Purchases:                              None 
Sales Charge (Load) Imposed on Reinvested Dividends:                   None 
Redemption Fees:                                                       None 
Exchange Fees:                                                         None
    
Annual Fund Operating Expenses (expenses deducted from the underlying funds'
assets) 
Indirect Operating Expenses:                                              *

* Although STAR Fund incurs no net expenses directly, the Fund's shareholders
  indirectly bear the expenses of the underlying Vanguard funds in which the
  Fund invests. See The Fund and Vanguard. The Fund's indirect expense ratio,
  based on its investments in the underlying Vanguard funds, was 0.37% as of
  December 31, 1998.      

  The following example is intended to help you compare the cost of investing in
the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.
    
     ----------------------------------------------------------------
               1 Year     3 Years     5 Years     10 Years
     ----------------------------------------------------------------
                $38        $119        $207         $467
     ----------------------------------------------------------------
     
  This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.
<PAGE>
 
                                                                               3


Additional Information
    
Dividends and Capital Gains
Dividends are distributed in June and December; capital gains, if any, are
distributed annually in December

Investment Adviser
The Fund does not employ an investment adviser, but rather benefits from the
investment advisory services provided to the underlying Vanguard funds in which
it invests
     
Inception Date

March 29, 1985
    
Net Assets as of December 31, 1998 

$8.08 billion
     
Suitable for IRAs

Yes

Minimum Initial Investment 

$1,000

Newspaper Abbreviation

STAR

Vanguard Fund Number

056

Cusip Number

921909107

Ticker Symbol

VGSTX

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A Word About Risk

This prospectus describes the risks you would face as an investor in Vanguard
STAR Fund. It is important to keep in mind one of the main axioms of investing:
The higher the risk of losing money, the higher the potential reward. The
reverse, also, is generally true: The lower the risk, the lower the potential
reward. As you consider an investment in Vanguard STAR Fund, you should also
take into account your personal tolerance for the daily fluctuations of the
stock and bond markets. 

  Look for this [GRAPHIC APPEARS HERE] symbol throughout the prospectus. It is
used to mark detailed information about each type of risk that you would
confront as a shareholder of the Fund.
- --------------------------------------------------------------------------------

Who Should Invest

The Fund may be a suitable investment for you if:

 . You wish to add a balanced fund to your existing holdings, which could include
  other stock and bond--as well as money market and tax-exempt--investments.

 . You are seeking growth of your capital over the long term--at least five
  years--without taking undue risk.

 . You are seeking moderate current income.

                                PLAIN TALK ABOUT

                            Costs and Market-Timing

Some investors try to profit from market-timing--switching money into
investments when they expect prices to rise, and taking money out when they
expect the market to fall. As money is shifted in and out, a fund incurs
expenses for buying and selling securities. These costs are borne by all fund
shareholders, including the long-term investors who do not generate the costs.
Therefore, the Fund discourages short-term trading by, among other things,
limiting the number of exchanges it permits.

  The Vanguard funds do not permit market-timing. Do not invest in this Fund if
you are a market-timer.
<PAGE>
 
4

  The Fund has adopted the following policies, among others, to discourage
  short-term trading:

 . The Fund reserves the right to reject any purchase request--including
  exchanges from other Vanguard funds--that it regards as disruptive to the
  efficient management of the Fund. A purchase request could be rejected because
  of the timing of the request or because of a history of excessive trading by
  the investor.

 . There is a limit on the number of times you can exchange into and out of the
  Fund (see "Redeeming Shares" in the Investing with Vanguard section).

 . The Fund reserves the right to stop offering shares at any time.

                               PLAIN TALK ABOUT

                                Balanced Funds

Balanced funds are generally "middle-of-the-road" investments that seek to
provide some combination of growth, income, and conservation of capital by
investing in a mix of stocks, bonds, and/or money market instruments. Because
the prices of stocks and bonds often move in different directions, balanced
funds are able to use rewards from one type of investment to help offset the
risks from another.

                                PLAIN TALK ABOUT

                    Large-Cap, Mid-Cap, and Small-Cap Stocks

Stocks of publicly traded companies--and mutual funds that hold these
stocks--can be classified by the companies' market value, or capitalization.
Generally, Vanguard defines large-capitalization (large-cap) funds as those
holding stocks of companies whose outstanding shares have a market value
exceeding $10 billion. Mid-cap funds hold stocks of companies with a market
value between $1 billion and $10 billion. Small-cap funds typically hold stocks
of companies with a market value of less than $1 billion.
    
Primary Investment Strategies

This section explains how the Fund pursues its objective, long-term growth of
capital and income. The Fund's Board of Trustees oversees the management of the
Fund, and may change the investment strategies in the interest of shareholders.
In addition, this section discusses several important risks faced by investors
in the Fund.     

Market Exposure

Stocks
    
Through six underlying Vanguard funds, STAR Fund invests 60% to 70% of its
assets in common stocks. The Fund's indirect investment in stocks is designed to
provide long-term capital growth and some income. The underlying stock funds are
described on page 7.
     
[GRAPHIC  The Fund is subject to stock market risk, which is the possibility
APPEARS   that stock prices overall will decline over short or even long
HERE]     periods. Stock markets tend to move in cycles, with periods of rising
          prices and periods of falling prices.

     To illustrate the volatility of stock prices, the following table shows the
best, worst, and average total returns for the U.S. stock market over various
periods as measured by the Standard & Poor's 500 Composite Stock Price Index, a
widely used barometer of stock market activity. (Total returns consist of
dividend income plus change in market price.) Note that the returns shown do not
include the costs of buying and selling stocks or other expenses that a
real-world investment portfolio would incur. Note, also, that the gap between
best and worst tends to narrow over the long term.
    
- --------------------------------------------------------------------------------
                      U.S. Stock Market Returns (1926-1998)
- --------------------------------------------------------------------------------
                 1 Year      5 Years      10 Years      20 Years
- --------------------------------------------------------------------------------
Best              54.2%       24.1%         19.9%         17.7%
Worst            -43.1       -12.4          -0.8           3.1
Average           13.1        10.7          11.0          11.0
- --------------------------------------------------------------------------------
     
<PAGE>
 
                                                                               5

  The table covers all of the 1-, 5-, 10-, and 20-year periods from 1926 through
1998. You can see, for example, that while the average return on stocks for all
of the 5-year periods was 10.7%, returns for individual 5-year periods ranged
from a -12.4% average (from 1928 through 1932) to 24.1% (from 1994 through
1998). These average returns reflect past performance on common stocks; you
should not regard them as an indication of future returns from either the stock
market as a whole or this Fund in particular.

  Because stock and bond prices can move in different directions or in different
amounts, the Fund's bond and money market fund holdings may help to dampen--but
will not eliminate--the volatility experienced by the Fund as a result of its
stock fund holdings. The Fund's balanced portfolio, in the long run, should
result in less investment risk--and a lower investment return--than a fund
investing exclusively in common stocks.
    
[GRAPHIC  The Fund is subject to investment-style risk, which is the possibility
APPEARS   that returns from the stock market segments in which the Fund is most
HERE]     heavily weighted may underperform other asset classes or the overall
          stock market.

  Through its share ownership of the underlying stock funds, STAR Fund
indirectly owns a diversified mixture of common stocks. Although its indirect
stock holdings are predominantly large-cap, the Fund has significant exposure to
mid-cap stocks and some exposure to small-cap stocks. Mid-cap and small-cap
stocks tend to be more volatile than large-cap stocks. The Fund's indirect stock
holdings are predominantly value-oriented, although the Fund has significant
exposure to growth stocks.
     
Bonds
    
Through two underlying Vanguard funds, STAR Fund invests roughly 20% to 30% of
its assets in bonds, predominantly intermediate- and long-term bonds. The Fund's
indirect investment in bonds is designed to provide a high level of current
income with less price volatility than would be expected from the stock portion
of its holdings. The underlying bond funds are described on pages 7-8.      
    
[GRAPHIC  The Fund is subject to interest rate risk, which is the possibility
APPEARS   that bond prices overall will decline over short or even long periods
HERE]     due to rising interest rates. Interest rate risk is modest for 
          shorter-term bonds and higher for longer-term bonds.
     
  Although bonds are often thought to be less risky than stocks, there have been
periods when bond prices have fallen significantly due to rising interest rates.
For instance, prices of long-term bonds fell by almost 48% between December 1976
and September 1981. 

  To illustrate the relationship between bond prices and interest rates, the
following table shows the impact of a 2% change (both up and down) in interest
rates on three bonds of different maturities, each with a face value of $1,000.
    
- --------------------------------------------------------------------------------
                 How Interest Rate Changes Affect Bond Prices*
- --------------------------------------------------------------------------------
                             Value of a $1,000 Bond     Value of a $1,000 Bond
                              After a 2% Increase        After a 2% Decrease
Type of Bond (Maturity)        in Interest Rates          in Interest Rates
- --------------------------------------------------------------------------------
Short-Term (2.5 years)                $956                       $1,046
Intermediate-Term (10 years)           870                        1,156
Long-Term (20 years)                   816                        1,251
- --------------------------------------------------------------------------------
*Assuming a 7% yield.           
- --------------------------------------------------------------------------------
     
                                PLAIN TALK ABOUT

                            Bonds and Interest Rates

As a rule, when interest rates rise, bond prices fall. The opposite is also
true: Bond prices go up when interest rates fall. Why do bond prices and
interest rates move in opposite directions? Let's assume that you hold a bond
offering a 5% yield. A year later, interest rates are on the rise and bonds are
offered with a 6% yield. With higher-yielding bonds available, you would have
trouble selling your 5% bond for the price you paid--causing you to lower your
asking price. On the other hand, if interest rates were falling and 4% bonds
were being offered, you should be able to sell your 5% bond for more than you
paid.
<PAGE>
 
6

                                PLAIN TALK ABOUT

                                Bond Maturities
    
A bond is issued with a specific maturity date--the date when the bond's issuer,
or seller, must pay back the bond's initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30 years
(long-term). The longer a bond's maturity, the more risk you, as a bond
investor, face as interest rates rise--but also the more interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hope of higher yields; short-term bond investors should be willing to
accept lower yields in return for less fluctuation in the value of their
investment.      
    
  These figures are intended only to illustrate interest rate risk; they should
not be regarded as an indication of future returns from the bond market as a
whole, or STAR Fund in particular. Also, changes in interest rates may not have
as dramatic an effect on the Fund as they would on a fund made up entirely of
bonds.      

[GRAPHIC  The Fund is subject to credit risk, which is the possibility that a
APPEARS   bond issuer will fail to pay interest and principal in a timely
HERE]     manner.

  Since the underlying Vanguard bond funds invest in high-quality obligations,
credit risk is relatively low.
    
[GRAPHIC  The Fund is also subject to call risk (in the case of corporate bonds)
APPEARS   and prepayment risk (in the case of mortgage-backed bonds), which is
HERE]     the possibility that during periods of falling interest rates a bond
          issuer will repay a higher-yielding bond before its maturity date.
          Forced to reinvest the unanticipated proceeds at lower interest rates,
          the Fund would experience a decline in income.      
    
Money Market Instruments
Through one underlying Vanguard fund, STAR Fund invests roughly 10% to 20% of
its assets in high-quality money market instruments. From this investment, the
Fund seeks to provide a high level of current income while maintaining stability
of principal for this portion of its holdings.
  The underlying money market fund is subject to a high level of income risk,
which is the possibility that dividends will fall if short-term interest rates
fall, and a low level of credit risk, which is the chance that an issuer of a
money market instrument will fail to pay interest or repay principal in a timely
manner. Because the Fund does not invest heavily in the money market fund,
however, both income risk and credit risk to STAR Fund will be low.      
    
Security Selection
Vanguard STAR Fund is a "fund of funds," which means that it achieves its
objective by investing in a combination of other mutual funds rather than in
individual securities.
  Decisions about how to allocate STAR Fund's assets among the underlying funds
are made by the Trustees of the Fund based on the Fund's investment objective
and policies. Generally, the Fund invests 60% to 70% of its assets in stock
funds, 20% to 30% in bond funds, and 10% to 20% in a money market fund. While
these allocations may shift from time to time, stocks can be expected to
represent at least 60% of the Fund's holdings at any given time.
     
                                PLAIN TALK ABOUT

                                "Fund of Funds"

The term "fund of funds" is used to describe a mutual fund that pursues its
objective by investing in other mutual funds rather than in individual stocks or
bonds. A fund of funds may charge for its own direct expenses, in addition to
bearing a proportionate share of the expenses charged by the underlying funds in
which it invests. Funds of funds are best suited for long-term investors.
<PAGE>
 
                                                                               7
    
[GRAPHIC  The Fund is subject to manager risk, which is the possibility that the
APPEARS   investment advisers of the underlying funds may do a poor job of
HERE]     selecting securities.
     
  The underlying Vanguard funds are run by their investment advisers according
to traditional methods of active investment management. This means that
securities are bought and sold according to the advisers' judgments about
companies and their financial prospects, about issuers of bonds and money market
instruments, and about the general level of interest rates.

  The Fund is generally managed without regard to tax ramifications.

Stocks
    
STAR Fund invests in the following stock funds, in approximately the percentages
indicated:

1. Vanguard Windsor II Fund (27%)
2. Vanguard Windsor Fund (16%)
3. Vanguard Explorer Fund (5%)
4. Vanguard Morgan Growth Fund (5%)
5. Vanguard PRIMECAP Fund (5%)
6. Vanguard U.S. Growth Fund (5%)

  Vanguard Windsor Fund and Vanguard Windsor II Fund are value-oriented stock
funds, chosen primarily for their potential for long-term capital growth, as
well as for their current income-producing capabilities. They work toward these
goals by investing in large- and medium-size companies believed by the adviser
to be undervalued when purchased. These stocks typically--but not always--have
lower-than-average price/earnings ratios and higher-than-average dividend
yields.

  Vanguard Morgan Growth Fund, Vanguard PRIMECAP Fund, and Vanguard U.S. Growth
Fund are growth funds and Vanguard Explorer Fund is an aggressive growth fund.
These funds are held by STAR Fund primarily to provide long-term capital growth.
They work in different ways to achieve this goal.

 . Vanguard Explorer Fund invests in common stocks of small, unseasoned U.S.
  companies with higher risk characteristics but, in the advisers' opinion,
  above-average prospects for growth.

 . Vanguard Morgan Growth Fund invests mainly in stocks of U.S. growth companies.
  The majority of the fund's assets are invested in "established" companies that
  have above-average growth rates over the long term; the remainder are invested
  in "emerging" companies that have potential for continued growth, but at
  slower rates.

 . Vanguard PRIMECAP Fund invests in stocks of large and medium size U.S.
  companies that have past records of growth and, in the adviser's opinion,
  above-average prospects for continued growth.

 . Vanguard U.S. Growth Fund invests in stocks of large, seasoned U.S. companies
  that have past records of growth and, in the adviser's opinion, above-average
  prospects for continued growth. 

  Although there are no present plans to do so, the Fund also is authorized to
invest in Vanguard 500 Index Fund, which tracks the performance of the S&P 500
Index.

Bonds

STAR Fund invests in two bond funds, in approximately the percentages indicated:

1. Vanguard GNMA Fund (12.5%)
2. Vanguard Long-Term Corporate Fund (12.5%)
     
  Both bond funds seek to provide a high and stable level of income. They work
toward this goal, however, in different ways:

                                PLAIN TALK ABOUT

                                 Types of Bonds
    
Bonds are issued (sold) by many sources: Corporations issue corporate bonds; the
federal government issues U.S. Treasury bonds; agencies of the federal
government issue agency bonds; and mortgage holders issue "mortgage-backed"
bonds such as those issued by the Government National Mortgage Association
(GNMA). Each issuer is responsible for paying back the bond's initial value as
well as making periodic interest payments.      

<PAGE>
 
8


                                PLAIN TALK ABOUT

                                 Credit Quality

A bond's credit quality depends on the issuer's ability to pay interest on the
bond and, ultimately, to repay the debt. The lower the rating by one of the
independent bond-rating agencies (for example, Moody's or Standard & Poor's),
the greater the chance (in the rating agency's opinion) that the bond issuer
will default, or fail to meet its payment obligations. All things being equal,
the lower a bond's credit rating, the higher its yield should be to compensate
investors for assuming additional risk.
    
 . Vanguard GNMA Fund invests at least 80% of its assets in mortgage-backed bonds
  issued by the Government National Mortgage Association. The bonds offer a U.S.
  government guarantee of timely principal and interest payments, along with
  income that usually exceeds that of comparable U.S. Treasury securities. The
  fund's average weighted maturity depends on homeowner prepayments of the
  underlying mortgages, but normally falls within an intermediate-term range
  (5 to 10 years).

 . Vanguard Long-Term Corporate Fund invests in a diversified group of
  investment-grade corporate bonds--that is, bonds issued by corporations that
  are rated at least Baa by Moody's Investors Service, Inc., or BBB by Standard
  & Poor's Corporation. The fund maintains an average weighted maturity of 15 to
  25 years.
     
Money Market Instruments
    
STAR Fund invests in one money market fund, Vanguard Prime Money Market Fund.
Prime Money Market Fund invests in high-quality, short-term money market
instruments rated in one of the two highest credit quality categories. STAR Fund
invests approximately 12% of its assets in Prime Money Market Fund.

  Note: On June 30, 1998, the shareholders of STAR Fund authorized the Fund to
purchase shares of Vanguard Short-Term Corporate Fund, in addition to or in lieu
of Prime Money Market Fund, for the Fund's cash reserve investment. Short-Term
Corporate Fund invests primarily in high-quality corporate bonds with an average
maturity between one and three years. The fund is subject to a lower level of
income risk and a higher level of credit risk than Prime Money Market Fund. In
addition, Short-Term Corporate Fund is subject to interest rate risk, although
this risk is low because the fund holds short-term bonds. Overall, Short-Term
Corporate Fund is riskier than Prime Money Market Fund, but it also should
provide a slightly higher return.
     
Other Investment Policies and Risks

The Fund's underlying funds may invest, to a limited extent, in foreign
securities.
    
  The Fund's underlying funds may, from time to time, take temporary defensive
measures--such as holding cash reserves without limit--that are inconsistent
with the funds' primary investment strategies, in response to adverse market,
economic, political, or other conditions. If one or more of the underlying funds
takes temporary defensive measures, STAR Fund may not achieve its investment
objective.      

                                PLAIN TALK ABOUT

                     Vanguard's Unique Corporate Structure

The Vanguard Group is truly a mutual mutual fund company. It is owned jointly by
the funds it oversees and thus indirectly by the shareholders in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person, by a group of individuals, or by investors who own the
management company's stock. By contrast, Vanguard provides its services on an
"at-cost" basis, and the funds' expense ratios reflect only these costs. No
separate management company reaps profits or absorbs losses from operating the
funds.
<PAGE>
 
                                                                               9

The Fund and Vanguard
    
STAR Fund has entered into an agreement with Vanguard under which Vanguard
provides all management, administrative, and distribution services to the Fund
at cost. The Fund owes Vanguard a sum sufficient to cover Vanguard's
out-of-pocket costs. The Fund also bears the expenses of services provided by
other parties (such as auditors, legal counsel, and the Fund's custodian), as
well as taxes and other direct expenses of the Fund. However, the agreement
provides that the Fund's expenses will be offset by reimbursements from Vanguard
for (a) contributions made by the Fund to the cost of operating the underlying
Vanguard funds in which STAR Fund invests, and (b) certain savings in
administrative and marketing costs that Vanguard is expected to derive from the
operation of the Fund.      

  The Fund's Trustees believe that the reimbursements should be sufficient to
offset most, if not all, of the expenses incurred by the Fund. Therefore, the
Fund is expected to operate at a very low or zero expense ratio. Since its
inception in 1985, the Fund in fact has had no direct net expenses. 

  Of course, shareholders of STAR Fund will still bear, indirectly, their
proportionate share of the costs of operating the underlying Vanguard funds. The
following chart provides the expense ratio for each of the underlying funds
during STAR Fund's 1998 fiscal year, as well as the percentage of STAR Fund's
net assets invested in each fund as of December 31, 1998:

                               PLAIN TALK ABOUT
    
                                 Fund Expenses
 
All mutual funds have operating expenses. These expenses, which are deducted
from a fund's gross income, are expressed as a percentage of the net assets of
the fund. STAR Fund's indirect expense ratio in fiscal year 1998 was 0.37%, or
$3.70 per $1,000 of average net assets. The average balanced mutual fund had
expenses in 1998 of 1.31%, or $13.10 per $1,000 of average net assets, according
to Lipper Inc., which reports on the mutual fund industry.

     ----------------------------------------------------------------------
                                                              Percentage of
                                                 Expense       STAR Fund's
     Underlying Fund                              Ratio        Net Assets
     ----------------------------------------------------------------------
     Windsor II Fund                               0.41%          27.3%
     Windsor Fund                                  0.27           15.4
     PRIMECAP Fund                                 0.51            5.1
     U.S. Growth Fund                              0.41            5.1
     Morgan Growth Fund                            0.44            5.2
     Explorer Fund                                 0.62            5.3
     GNMA Fund                                     0.30           12.3
     Long-Term Corporate Fund                      0.30           12.5
     Prime Money Market Fund                       0.33           11.8
     ----------------------------------------------------------------------
                                                                 100.0%
     ----------------------------------------------------------------------

  Based on these figures, the indirect expense ratio for STAR Fund's
underlying investments on December 31, 1998 was 0.37%. Vanguard expects the
Fund's indirect expense ratio in 1999 to remain at or about 0.37%.
     
<PAGE>
 
10

Investment Adviser

STAR Fund does not employ an investment adviser. Rather decisions about how its
assets will be invested in the underlying funds are made by the Fund's Board of
Trustees based on the Fund's investment objective and policies. Of course, the
Fund benefits from the investment advisory services rendered to the underlying
funds. Some of the underlying funds employ one investment advisory firm, while
others have as many as four. 

  The chart below lists the investment advisory firms employed by each
underlying fund:
    
      --------------------------------------------------------------------------
      Underlying Fund                 Investment Adviser
      --------------------------------------------------------------------------
      Vanguard Windsor Fund           Wellington Management Company, LLP
                                      Sanford C. Bernstein & Company*
      --------------------------------------------------------------------------
      Vanguard Windsor II Fund        Barrow, Hanley, Mewhinney & Strauss, Inc.
                                      Equinox Capital Management, Inc. 
                                      Tukman Capital Management, Inc. 
                                      Vanguard Core Management Group
      --------------------------------------------------------------------------
      Vanguard Morgan Growth Fund     Franklin Portfolio Associates, LLC
                                      Vanguard Core Management Group 
                                      Wellington Management Company, LLP
      --------------------------------------------------------------------------
      Vanguard U.S. Growth Fund       Lincoln Capital Management Company
      --------------------------------------------------------------------------
      Vanguard PRIMECAP Fund          PRIMECAP Management Company
      --------------------------------------------------------------------------
      Vanguard Explorer Fund          Granahan Investment Management, Inc. 
                                      Wellington Management Company, LLP 
                                      Chartwell Investment Partners 
                                      Vanguard Core Management Group
      --------------------------------------------------------------------------
      Vanguard GNMA Fund              Wellington Management Company, LLP 
      --------------------------------------------------------------------------
      Vanguard Long-Term              Wellington Management Company, LLP 
      Corporate Fund 
      --------------------------------------------------------------------------
      Vanguard Prime Money Market     Vanguard Fixed Income Group
      Fund     
      --------------------------------------------------------------------------
      *Windsor Fund's Board of Trustees has decided to add Sanford C. Bernstein
      & Company as a co-adviser of the fund, effective June 1, 1999.
      --------------------------------------------------------------------------
     
<PAGE>
 
                                                                              11

The chart below briefly describes each investment advisory firm:
    
      --------------------------------------------------------------------------
      Firm                                Background
      --------------------------------------------------------------------------
      Wellington Management Company, LLP  Based in Boston, Massachusetts 
                                          Founded in 1928 
                                          Manages more than $209 billion in 
                                          assets
      --------------------------------------------------------------------------
      Sanford C. Bernstein & Company      Based in New York, New York 
                                          Founded in 1968 
                                          Manages more than $78 billion in
                                          assets
      --------------------------------------------------------------------------
      Barrow, Hanley, Mewhinney &         Based in Dallas, Texas 
      Strauss, Inc.                       Founded in 1979 
                                          Manages more than $36 billion in 
                                          assets
      --------------------------------------------------------------------------
      Equinox Capital Management, Inc.    Based in New York, New York 
                                          Founded in 1989 
                                          Manages more than $12 billion in
                                          assets
      --------------------------------------------------------------------------
      Tukman Capital Management, Inc.     Based in Larkspur, California 
                                          Founded in 1980 
                                          Manages more than $7.9 billion in 
                                          assets
      --------------------------------------------------------------------------
      Franklin Portfolio Associates, LLC  Based in Boston, Massachusetts 
                                          Founded in 1982 
                                          Manages more than $18 billion in 
                                          assets
      --------------------------------------------------------------------------
      Lincoln Capital Management Company  Based in Chicago, Illinois 
                                          Founded in 1967 
                                          Manages more than $62 billion in
                                          assets
      --------------------------------------------------------------------------
      PRIMECAP Management Company         Based in Pasadena, California 
                                          Founded in 1983 
                                          Manages more than $15 billion in 
                                          assets
      --------------------------------------------------------------------------
      Granahan Investment Management,     Based in Waltham, Massachusetts 
      Inc.                                Founded in 1985 
                                          Manages more than $1.3 billion in 
                                          assets
      --------------------------------------------------------------------------
      Chartwell Investment Partners       Based in Berwyn, Pennsylvania 
                                          Founded in 1997 
                                          Manages more than $2.7 billion in 
                                          assets
      --------------------------------------------------------------------------
      Vanguard Core Management Group      Based in Valley Forge, Pennsylvania 
                                          Founded in 1974 
                                          Manages more than $147 billion in 
                                          assets
      --------------------------------------------------------------------------
      Vanguard Fixed Income Group         Based in Valley Forge, Pennsylvania 
                                          Founded in 1974 
                                          Manages more than $127 billion in 
                                          assets
      --------------------------------------------------------------------------

  The Board of Trustees of an underlying fund may, without prior approval from
shareholders of the underlying fund or STAR Fund, change the terms of any
advisory agreement or hire a new investment adviser, either as a replacement
for an adviser or as an additional adviser.
     
<PAGE>
 
12

Year 2000 Challenge

The common practice in computer programming of using just two digits to identify
a year has resulted in the Year 2000 challenge throughout the information
technology industry. If unchanged, many computer applications and systems could
misinterpret dates occurring after December 31, 1999, leading to errors or
failure. Such failure could adversely affect a fund's operations, including
pricing, securities trading, and the servicing of shareholder accounts. 

  The Vanguard Group is dedicated to providing uninterrupted, high-quality
performance from our computer systems before, during, and after 2000. In July
1998, we completed the renovation and initial testing of our internal systems.
Vanguard is diligently working with external partners, suppliers, and vendors,
including fund managers and other service providers, to assure that the systems
with which we interact remain operational at all times. 

  In addition to taking every reasonable step to secure our internal systems and
external relationships, Vanguard is further developing contingency plans
intended to assure that unexpected systems failures will not adversely affect
the Fund's operations. Vanguard intends to monitor these processes through the
rollover of 1999 into 2000 and to quickly implement alternate solutions if
necessary. 

  However, despite Vanguard's efforts and contingency plans, noncompliant
computer systems could have a material adverse effect on the Fund's business,
operations, or financial condition. Additionally, the Fund's performance could
be hurt if a computer-system failure at a company or governmental unit affects
the price of securities the Fund's underlying funds own.


Dividends, Capital Gains, and Taxes
    
The Fund distributes to shareholders virtually all of its net income (interest
and dividends paid by the underlying funds) as well as any capital gains
realized from the sale of its holdings or received as capital gains
distributions from the underlying funds. Income distributions generally occur in
June and December; capital gains distributions generally occur in December. In
addition, the Fund may occasionally be required to make supplemental income or
capital gains distributions at some other time during the year.       

  You can receive distributions of income or capital gains in cash, or you can
have them automatically invested in more shares of the Fund. In either case,
these distributions are taxable to you. It is important to note that
distributions of dividends and capital gains that are declared in December--if
paid to you by the end of January--are taxed as if they had been paid to you in
December. 

  Vanguard will send you a statement each year showing the tax status of all
your distributions. If you have chosen to receive dividend and/or capital gains
distributions in cash, and the postal or other delivery service is unable to
deliver checks to your address of record, we will change the distribution option
so that all dividends and other distributions are automatically invested in
additional shares. We will not pay interest on uncashed distribution checks.

 . The dividends and short-term capital gains that you receive are considered
  ordinary income for tax purposes.
    
 . Any distributions of net long-term capital gains by the Fund are taxable to
  you as long-term capital gains, no matter how long you've owned shares in the
  Fund.

 . Although the Fund does not seek to realize any particular amount of capital
  gains during a year, such gains are realized from time to time as by-products
  of its ordinary investment activities and the investment activities of the
  underlying funds. Consequently, distributions may vary considerably from year
  to year.
     
 . If you sell or exchange shares, any gain or loss you have is a taxable event.
  This means that you may have a capital gain to report as income, or a capital
  loss to report as a deduction, when you complete your federal income tax
  return.

 . Distributions of dividends or capital gains, and capital gains or losses from
  your sale or exchange of Fund shares, may be subject to state and local income
  taxes as well.
<PAGE>
 
                                                                              13

                               PLAIN TALK ABOUT
    
                              "Buying a Dividend"

Unless you are investing through a tax-deferred retirement account (such as an
IRA), it is not to your advantage to buy shares of a fund shortly before it
makes a distribution, because doing so can cost you money in taxes. This is
known as "buying a dividend." For example: on December 15, you invest $5,000,
buying 250 shares for $20 each. If the fund pays a distribution of $1 per share
on December 16, its share price would drop to $19 (not counting market change).
You still have only $5,000 (250 shares x $19 = $4,750 in share value, plus 250
shares x $1 = $250 in distributions), but you owe tax on the $250 distribution
you receive--even if you reinvest it in more shares. To avoid "buying a
dividend," check a fund's distribution schedule before you invest.      

  The tax information in this prospectus is provided as general information and
will not apply to you if you are investing through a tax-deferred account such
as an IRA or a qualified employee benefit plan. (Non-U.S. investors may be
subject to U.S. withholding and estate tax.) You should consult your tax adviser
about the tax consequences of an investment in the Fund.

  Important Note: By law, the Fund must withhold 31% of your taxable
distributions and any redemption proceeds if you do not provide your correct
taxpayer identification number, or certify that it is correct, or if the IRS
instructs the Fund to do so.


Share Price

The Fund's share price, called its net asset value, or NAV, is calculated each
business day after the close of trading on the New York Stock Exchange (the NAV
is not calculated on holidays or other days the Exchange is closed). Net asset
value per share is computed by adding up the total value of the Fund's
investments (i.e., shares of the underlying Vanguard funds) and other assets,
subtracting any of its liabilities (debts), and then dividing by the number of
Fund shares outstanding:

                                      Total Assets - Liabilities
              Net Asset Value =  -------------------------------------
                                      Number of Shares Outstanding

  Knowing the daily net asset value is useful to you as a shareholder because it
indicates the current value of your investment. The Fund's NAV, multiplied by
the number of shares you own, gives you the dollar amount you would have
received had you sold all of your shares back to the Fund that day. 
         
  The Fund's share price can be found daily in the mutual fund listings of most
major newspapers under the heading "Vanguard Funds." Different newspapers use
different abbreviations of the Fund's name, but the most common is STAR.
<PAGE>
 
14

                               PLAIN TALK ABOUT
    
                  How to Read the Financial Highlights Table

The Fund began fiscal 1998 with a net asset value (price) of $17.38 per share.
During the year, the Fund earned $.58 per share from investment income, $.86 per
share in capital gains distributions, and $.70 per share from investments that
had appreciated in value or that were sold for higher prices than the Fund paid
for them. 

  Shareholders received $1.56 per share in the form of dividend and capital
gains distributions. A portion of each year's distributions may come from the
prior year's income or capital gains.

  The earnings ($2.14 per share) minus the distributions ($1.56 per share)
resulted in a share price of $17.96 at the end of the year. This was an increase
of $.58 per share (from $17.38 at the beginning of the year to $17.96 at the end
of the year). For a shareholder who reinvested the distributions in the purchase
of more shares, the total return from the Fund was 12.38% for the year.

  As of December 31, 1998, the Fund had $8.08 billion in net assets. For the
year, its net investment income amounted to 3.18% of its average net assets; and
it sold and replaced securities valued at 16% of its net assets.      

Financial Highlights

The following financial highlights table is intended to help you understand the
Fund's financial performance for the past five years, and certain information
reflects financial results for a single Fund share. The total returns in the
table represent the rate that an investor would have earned or lost each year on
an investment in the Fund (assuming reinvestment of all dividends and
distributions). This information has been derived from the financial statements
audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along with the Fund's financial statements--is included in the Fund's
most recent annual report to shareholders. You may have the annual report sent
to you without charge by contacting Vanguard.
<TABLE>     
<CAPTION>
- --------------------------------------------------------------------------------------------
                                                           Vanguard STAR Fund
                                                         Year Ended December 31,
                                            ------------------------------------------------
                                              1998      1997      1996       1995       1994
- --------------------------------------------------------------------------------------------
<S>                                         <C>       <C>       <C>        <C>        <C>   
Net Asset Value, Beginning of Year          $17.38    $15.86    $15.03     $12.61     $13.41
- --------------------------------------------------------------------------------------------
Investment Operations
  Net Investment Income                        .58       .60       .58       .590        .53
  Capital Gains Distributions Received         .86      1.06       .63       .435        .26
Net Realized and Unrealized Gain (Loss)
  on Investments                               .70      1.65      1.19      2.550       (.82)
                                            ------------------------------------------------
  Total from Investment Operations            2.14      3.31      2.40      3.575       (.03)
                                            ------------------------------------------------
Distributions
  Dividends from Net Investment Income        (.58)     (.59)     (.59)     (.590)      (.52)
  Distributions from Realized Capital Gains   (.98)    (1.20)     (.98)     (.565)      (.25)
                                            ------------------------------------------------
    Total Distributions                      (1.56)    (1.79)    (1.57)    (1.155)      (.77)
- --------------------------------------------------------------------------------------------
Net Asset Value, End of Year                $17.96    $17.38    $15.86     $15.03     $12.61
============================================================================================

Total Return                                 12.38%    21.15%    16.11%     28.64%     -0.21%
============================================================================================

Ratios/Supplemental Data
  Net Assets, End of Year (Millions)        $8,083    $7,355    $5,863     $4,842     $3,766
  Ratio of Total Expenses to
    Average Net Assets                           0%        0%        0%         0%         0%
  Ratio of Net Investment Income to
    Average Net Assets                        3.18%     3.46%     3.71%      4.12%      4.01%
  Turnover Rate                                 16%       15%       18%        13%         9%
============================================================================================
</TABLE>      

  From time to time, the Vanguard funds advertise yield and total return
figures. Yield is a measure of past dividend income. Total return includes both
past dividend income (assuming that it has been reinvested) plus realized and
unrealized capital appreciation (or depreciation). Neither yield nor total
return should be used to predict the future performance of a fund.

"Standard & Poor's((R))," "S&P((R))," "S&P 500((R))," "Standard & Poor's 500,"
and "500" are trademarks of The McGraw-Hill Companies, Inc.
<PAGE>
 
                                                                              15

Investing with Vanguard

Are you looking for the most convenient way to open or add money to a Vanguard
account? Obtain instant access to fund information? Establish an account for a
minor child or for your retirement savings? 

  Vanguard can help. Our goal is to make it easy and pleasant for you to do
business with us.

  The following sections of the prospectus briefly explain the many services we
offer. Booklets providing detailed information are available on the services
marked with a [GRAPHIC APPEARS HERE]. Please call us to request copies.


Services and Account Features


Vanguard offers many services that make it convenient to buy, sell, or exchange
shares, or to obtain fund or account information.
- --------------------------------------------------------------------------------
Telephone Redemptions (Sales and Exchanges)
Automatically set up for this Fund unless you notify us otherwise.
- --------------------------------------------------------------------------------
Vanguard Direct Deposit Service(TM)[GRAPHIC APPEARS HERE]
Automatic method for depositing your paycheck or U.S. government payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
Vanguard Automatic Exchange Service(TM) [GRAPHIC APPEARS HERE]
Automatic method for moving a fixed amount of money from one Vanguard fund
account to another.
- --------------------------------------------------------------------------------
Vanguard Fund Express(R) [GRAPHIC APPEARS HERE]
Electronic method for buying or selling shares. You can transfer money between
your Vanguard fund account and an account at your bank, savings and loan, or
credit union on a systematic schedule or whenever you wish.
- --------------------------------------------------------------------------------
Vanguard Dividend Express(TM) [GRAPHIC APPEARS HERE]
Electronic method for transferring dividend and/or capital gains distributions
directly from your Vanguard fund account to your bank, savings and loan, or
credit union account.
- --------------------------------------------------------------------------------
Vanguard Tele-Account(R) 1-800-662-6273 (ON-BOARD) [GRAPHIC APPEARS HERE]
Toll-free 24-hour access to Vanguard fund and account information--as well as
some transactions--by using any touch-tone phone. Tele-Account provides total
return, share price, price change, and yield quotations for all Vanguard funds;
gives your account balances and history (e.g., last transaction, latest dividend
distribution); and allows you to sell or exchange fund shares.
- --------------------------------------------------------------------------------
Access Vanguard(TM) www.vanguard.com [GRAPHIC APPEARS HERE]
You can use your personal computer to perform certain transactions for most
Vanguard funds by accessing our website. To establish this service, you must
register through the website. We will then send to you, by mail, an account
access password that allows you to process the following financial and
administrative transactions online: 

 . Open a new account.*

 . Buy, sell, or exchange shares of most funds.

 . Change your name/address.

 . Add/change fund options (including dividend options, Vanguard Fund Express,
  bank instructions, checkwriting, and Vanguard Automatic Exchange Service).

*Only current Vanguard shareholders can open a new account online, by exchanging
shares from other existing Vanguard accounts.
- --------------------------------------------------------------------------------
Investor Information Department: 1-800-662-7447 (SHIP) Text Telephone:
1-800-952-3335 Call Vanguard for information on our funds, fund services, and
retirement accounts, and to request literature.
- --------------------------------------------------------------------------------
Client Services Department: 1-800-662-2739 (CREW) Text Telephone: 1-800-662-2738
Call Vanguard for information on your account, account transactions, and account
statements.
- --------------------------------------------------------------------------------
Services for Clients of Vanguard's Institutional Division: 1-888-809-8102
Vanguard's Institutional Division offers a variety of specialized services for
large institutional investors, including the ability to effect account
transactions through private electronic networks and third-party recordkeepers.
- --------------------------------------------------------------------------------
<PAGE>
 
16

Types of Accounts

Individuals and institutions can establish a variety of accounts with Vanguard.
- --------------------------------------------------------------------------------
For One or More People
Open an account in the name of one (individual) or more (joint tenants) people.
- --------------------------------------------------------------------------------
For Holding Personal Trust Assets [GRAPHIC APPEARS HERE]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
For Individual Retirement Accounts [GRAPHIC APPEARS HERE]
Open a traditional IRA account or a Roth IRA account. Eligibility and other
requirements are established by federal law and Vanguard custodial account
agreements. For more information, please call 1-800-662-7447 (SHIP).
- --------------------------------------------------------------------------------
For an Organization [GRAPHIC APPEARS HERE]
Open an account as a corporation, partnership, endowment, foundation, or other
entity.
- --------------------------------------------------------------------------------
For Third-Party Trustee Retirement Investments
Open an account as a retirement trust or plan based on an existing corporate or
institutional plan. These accounts are established by the trustee of the
existing plan.
- --------------------------------------------------------------------------------
Vanguard Prototype Plans
Open a variety of retirement accounts using Vanguard prototype plans for
individuals, sole proprietorships, and small businesses. For more information,
please call 1-800-662-2003.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
A Note on Investing with Vanguard Through Other Firms
You may purchase or sell Fund shares through a financial intermediary such as a
bank, broker, or investment adviser. If you invest with Vanguard through an
intermediary, please read that firm's program materials carefully to learn of
any special rules that may apply. For example, special terms may apply to
additional service features, fees or other policies. Consult your intermediary
to determine when your order will be priced.
- --------------------------------------------------------------------------------


Buying Shares

You buy your shares at the Fund's next-determined net asset value after Vanguard
receives your request. As long as your request is received before the close of
trading on the New York Stock Exchange, generally 4 p.m. Eastern time, you will
buy your shares at that day's net asset value.
- --------------------------------------------------------------------------------
Minimum Investment to . . .
open a new account $1,000

add to an existing account 
$100 by mail or exchange; $1,000 by wire.
    
- --------------------------------------------------------------------------------
A Note on Low Balances
The Fund reserves the right to close any nonretirement account whose balance
falls below the minimum initial investment. The Fund will deduct a $10 annual
fee in June if your nonretirement account balance at that time is below $500.
The fee is waived if your total Vanguard account assets are $50,000 or more.
- --------------------------------------------------------------------------------
     
By Mail to . . .[GRAPHIC APPEARS HERE]
open a new account
Complete and sign the application form and enclose your check.

add to an existing account
Mail your check with an Invest-By-Mail form detached from your confirmation
statement to the address listed on the form.
<PAGE>
 
                                                                              17

Make your check payable to: The Vanguard Group-56
All purchases must be made in U.S. dollars, and checks must be drawn on U.S.
banks.

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 2600                     455 Devon Park Drive 
Valley Forge, PA 19482-2600       Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 2900                     455 Devon Park Drive 
Valley Forge, PA 19482-2900       Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
IMPORTANT NOTE: To prevent check fraud, Vanguard will not accept checks made
payable to third parties.
- --------------------------------------------------------------------------------
By Telephone to . . .[GRAPHIC APPEARS HERE]
open a new account
Call Vanguard Tele-Account* 24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address, taxpayer identification number, and account type).

add to an existing account
Call Vanguard Tele-Account* 24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address, taxpayer identification number, and account type). Use Vanguard
Fund Express (see "Services and Account Features") to transfer assets from your
bank account. Call Client Services before your first use to verify that this
option is in place.

Vanguard Tele-Account             Client Services
1-800-662-6273                    1-800-662-2739

*You must obtain a Personal Identification Number through Tele-Account at least
seven days before you request your first exchange.
- --------------------------------------------------------------------------------
IMPORTANT NOTE: Once you've requested a telephone transaction and a confirmation
number has been assigned, the transaction cannot be revoked. We reserve the
right to refuse any purchase request.
- --------------------------------------------------------------------------------
By Wire to Open a New Account or Add to an Existing Account [GRAPHIC APPEARS 
HERE] Call Client Services to arrange your wire transaction. Wire transactions
are not available for retirement accounts, except for asset transfers and direct
rollovers.
    
Wire to:
FRB ABA 021001088 
HSBC Bank USA
     
For credit to:
Account: 000112046
Vanguard Incoming Wire Account

In favor of:
Vanguard STAR Fund-56
[Account number, or temporary number for a new account] 
[Registered account owner/s] 
[Registered address]
<PAGE>
 
18

Buying Shares (continued)

  You can redeem (that is, sell or exchange) shares purchased by check or
Vanguard Fund Express at any time. However, while your redemption request will
be processed at the next-determined net asset value after it is received, your
redemption proceeds will not be available until payment for your purchase is
collected, which may take up to ten calendar days.
- --------------------------------------------------------------------------------
A Note on Large Purchases

It is important that you call Vanguard before you invest a large dollar amount.
We must consider the interests of all Fund shareholders and so reserve the right
to refuse any purchase that will disrupt the Fund's operation or performance.
- --------------------------------------------------------------------------------


Redeeming Shares

This section describes how you can redeem--that is, sell or exchange--the Fund's
shares.

When Selling Shares:

 . Vanguard sends the redemption proceeds to you or a designated third party.*

 . You can sell all or part of your Fund shares at any time.

*May require a signature guarantee; see footnote on page 19.

When Exchanging Shares:

 . The redemption proceeds are used to purchase shares of a different Vanguard
  fund.

 . You must meet the receiving fund's minimum investment requirements.

 . Vanguard reserves the right to revise or terminate the exchange privilege,
  limit the amount of an exchange, or reject an exchange at any time, without
  notice.

In both cases, your transaction will be based on the Fund's next-determined
share price, subject to any special rules discussed in this prospectus. For
exchanges, the purchase side of the transaction will be based on the receiving
fund's next-determined share price, again subject to any special rules discussed
in this prospectus.
    
- --------------------------------------------------------------------------------
Note: Once a redemption is requested and a confirmation number given, the
transaction cannot be canceled.
- --------------------------------------------------------------------------------
     
HOW TO REQUEST A REDEMPTION

You can request a redemption from your Fund account in any one of three ways:
online, by telephone, or by mail.
- --------------------------------------------------------------------------------
Online Requests [GRAPHIC APPEARS HERE]

Access Vanguard at www.vanguard.com
You can use your personal computer to sell or exchange shares of most Vanguard
funds by accessing our website. To establish this service, you must register
through the website. We will then send you, by mail, an account access password
that will enable you to sell or exchange shares online (as well as perform other
transactions).

  Note: The Vanguard funds whose shares you cannot exchange online or by
telephone are Vanguard U.S. Stock Index Funds, Vanguard Balanced Index Fund,
Vanguard International Stock Index Funds, Vanguard REIT Index Fund, Vanguard
Total International Stock Index Fund, and Vanguard Growth and Income Fund. These
funds do, however, permit online and telephone exchanges within IRAs and other
retirement accounts. If you sell shares of these funds online, you will receive
a redemption check at your address of record.
- --------------------------------------------------------------------------------
Telephone Requests [GRAPHIC APPEARS HERE]
All Account Types Except Retirement:
Call Vanguard Tele-Account 24 hours a day--or Client Services during business
hours--to sell or exchange shares. You can exchange shares from this Fund to
open an account in another Vanguard fund or to add to an existing Vanguard fund
account with an identical registration.
<PAGE>
 
                                                                              19

Retirement Accounts:
You can exchange--but not sell--shares by calling Tele-Account or Client
Services.

Vanguard Tele-Account             Client Services
1-800-662-6273                    1-800-662-2739
- --------------------------------------------------------------------------------
SPECIAL INFORMATION: We will automatically establish the telephone redemption
option for your account, unless you instruct us otherwise in writing. While
telephone redemption is easy and convenient, this account feature involves a
risk of loss from unauthorized or fraudulent transactions. Vanguard will take
reasonable precautions to protect your account from fraud. You should do the
same by keeping your account information private and immediately reviewing any
account statements that we send to you. Make sure to contact Vanguard
immediately about any transaction you believe to be unauthorized.
- --------------------------------------------------------------------------------
We reserve the right to refuse a telephone redemption if the caller is unable to
provide: 

 [X] The ten-digit account number.
     
 [X] The name and address exactly as registered on the account.
                                                               
 [X] The primary Social Security or employer identification number as registered
     on the account.
                                                               
 [X] The Personal Identification Number, if applicable.        

  Please note that Vanguard will not be responsible for any account losses due
to telephone fraud, so long as we have taken reasonable steps to verify the
caller's identity. If you wish to remove the telephone redemption feature from
your account, please notify us in writing.
- --------------------------------------------------------------------------------
A Note on Unusual Circumstances

Vanguard reserves the right to revise or terminate the telephone redemption
privilege at any time, without notice. In addition, Vanguard can stop selling
shares or postpone payment at times when the New York Stock Exchange is closed
or under any emergency circumstances as determined by the U.S. Securities and
Exchange Commission. If you experience difficulty making a telephone redemption
during periods of drastic economic or market change, you can send us your
request by regular or express mail. Follow the instructions on selling or
exchanging shares by mail in this section.
- --------------------------------------------------------------------------------
Mail Requests [GRAPHIC APPEARS HERE]

All Account Types Except Retirement:
Send a letter of instruction signed by all registered account holders. Include
the fund name and account number and (if you are selling) a dollar amount or
number of shares OR (if you are exchanging) the name of the fund you want to
exchange into and a dollar amount or number of shares. To exchange into an
account with a different registration (including a different name, address,
taxpayer identification number, or account type), you must provide Vanguard with
written instructions that include the guaranteed signatures of all current
owners of the fund from which you wish to redeem.

Vanguard Retirement Accounts:
For information on how to request distributions from:

 . Traditional IRAs and Roth IRAs--call Client Services.

 . SEP-IRAs, SIMPLE IRAs, 403(b)(7) custodial accounts, and Profit-Sharing and
  Money Purchase Pension (Keogh) Plans--call Individual Retirement Plans at
  1-800-662-2003.

Depending on your account registration type, additional documentation may be
required.

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 1120                     455 Devon Park Drive 
Valley Forge, PA 19482-1120       Wayne, PA 19087-1815
<PAGE>
 
20

Redeeming Shares (continued)

For clients of Vanguard's Institutional Division ...

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 2900                     455 Devon Park Drive 
Valley Forge, PA 19482-2900       Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
A Note on Large Redemptions
It is important that you call Vanguard before you redeem a large dollar amount.
We must consider the interests of all fund shareholders and so reserve the right
to delay delivery of your redemption proceeds--up to seven days--if the amount
will disrupt the Fund's operation or performance. 

  If you redeem more than $250,000 worth of Fund shares within any 90-day
period, the Fund reserves the right to pay part or all of the redemption
proceeds above $250,000 in kind, i.e., in securities, rather than in cash.
         
- --------------------------------------------------------------------------------

OPTIONS FOR REDEMPTION PROCEEDS

You may receive your redemption proceeds in one of two ways: check, or exchange
to another Vanguard fund.
- --------------------------------------------------------------------------------
Check Redemptions

Normally, Vanguard will mail your check within two business days of a
redemption.
- --------------------------------------------------------------------------------
Exchange Redemptions

As described above, an exchange involves using the proceeds of your redemption
to purchase shares of another Vanguard fund.
- --------------------------------------------------------------------------------

FOR OUR MUTUAL PROTECTION

For your best interests and ours, Vanguard applies these additional requirements
to redemptions:

Request in "Good Order"

All redemption requests must be received by Vanguard in "good order." This means
that your request must include: 

 . The Fund name and account number.

 . The amount of the transaction (in dollars or shares).

 . Signatures of all owners exactly as registered on the account (for mail
  requests).

 . Signature guarantees (if required).*

 . Any supporting legal documentation that may be required.

 . Any outstanding certificates representing shares to be redeemed.

*For instance, a signature guarantee must be provided by all registered account
shareholders when redemption proceeds are to be sent to a different person or
address. A signature guarantee can be obtained from most banks, credit unions,
and licensed brokers.

Transactions are processed at the next-determined share price after Vanguard has
received all required information.
- --------------------------------------------------------------------------------
Limits on Account Activity

Because excessive account transactions can disrupt management of the Fund and
increase the Fund's costs for all shareholders, Vanguard limits account activity
as follows: 

 . You may make no more than two substantive "round trips" through the Fund
  during any 12-month period.

 . Your round trips through the Fund must be at least 30 days apart.

 . The Fund may refuse a share purchase at any time, for any reason.

 . Vanguard may revoke an investor's telephone exchange privilege at any time,
  for any reason.

A "round trip" is a redemption from the Fund followed by a purchase back into
the Fund. Also, "round trip" covers transactions accomplished by any combination
of methods, including transactions conducted by check, wire, or exchange to/from
another Vanguard fund. "Substantive" means a dollar amount that Vanguard
determines, in its sole discretion, could adversely affect the management of the
Fund.
- --------------------------------------------------------------------------------

                   20
<PAGE>
 
                                                                              21
- --------------------------------------------------------------------------------
Return Your Share Certificates

Any portion of your account represented by share certificates cannot be redeemed
until you return the certificates to Vanguard. Certificates must be returned
(unsigned), along with a letter requesting the sale or exchange you wish to
process, via certified mail to:

The Vanguard Group 
455 Devon Park Drive 
Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
All Trades Final

Vanguard will not cancel any transaction request (including any purchase or
redemption) that we believe to be authentic once the request has been received
and a confirmation number assigned.
- --------------------------------------------------------------------------------


Transferring Registration

You can transfer the registration of your Fund shares to another owner by
completing a transfer form and sending it to Vanguard.

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 1110                     455 Devon Park Drive 
Valley Forge, PA 19482-1110       Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group 
P.O. Box 2900                     455 Devon Park Drive 
Valley Forge, PA 19482-2900       Wayne, PA 19087-1815
- --------------------------------------------------------------------------------


Fund and Account Updates

STATEMENTS AND REPORTS

We will send you account and tax statements to help you keep track of your Fund
account throughout the year as well as when you are preparing your income tax
returns.

  In addition, you will receive financial reports about the Fund twice a year.
These comprehensive reports include an assessment of the Fund's performance (and
a comparison to its industry benchmark), an overview of the markets, a report
from the advisers, and the Fund's financial statements which include a listing
of the Fund's holdings.
    
  To keep the Fund's costs as low as possible (so that you and other
shareholders can keep more of the Fund's investment earnings), Vanguard attempts
to eliminate duplicate mailings to the same address. When we find that two or
more Fund shareholders have the same last name and address, we send just one
Fund report to that address--instead of mailing separate reports to each
shareholder. If you want us to send separate reports, however, you may notify
our Client Services Department at 1-800-662-2739.      
- --------------------------------------------------------------------------------
Confirmation Statement

Sent each time you buy, sell, or exchange shares; confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
Portfolio Summary [GRAPHIC APPEARS HERE]

Mailed quarterly for most accounts; shows the market value of your account at
the close of the statement period, as well as distributions, purchases, sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------


<PAGE>
 
22

Fund and Account Updates (continued)

- --------------------------------------------------------------------------------
Fund Financial Reports

Mailed in February and August for this Fund.
- --------------------------------------------------------------------------------
Tax Statements

Generally mailed in January; report previous year's dividend and capital gains
distributions, proceeds from the sale of shares, and distributions from IRAs or
other retirement accounts.
- --------------------------------------------------------------------------------
Average Cost Review Statement [GRAPHIC APPEARS HERE]

Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average cost of shares that you redeemed during the calendar year,
using the average cost single category method.
- --------------------------------------------------------------------------------

<PAGE>
 
                     (This page intentionally left blank.)



<PAGE>
 
                     (This page intentionally left blank.)



<PAGE>
 
Glossary of Investment Terms

Balanced Fund

A mutual fund that seeks to provide some combination of income, capital growth,
and conservation of capital by investing in stocks, bonds, and/or money market
instruments.

Bond

A debt security (IOU) issued by a corporation, government, or government agency
in exchange for the money you lend it. In most instances, the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

Capital Gains Distribution

Payment to mutual fund shareholders of gains realized on securities that the
fund has sold at a profit, minus any realized losses.

Cash Reserves

Cash deposits, short-term bank deposits, and money market instruments which
include U.S. Treasury bills, bank certificates of deposit (CDs), repurchase
agreements, commercial paper, and banker's acceptances.

Common Stock

A security representing ownership rights in a corporation. A stockholder is
entitled to share in the company's profits, some of which may be paid out as
dividends.

Credit Quality
    
A measure of a bond issuer's ability to pay interest and principal in a timely
manner.      

Dividend Income

Payment to shareholders of income from interest or dividends generated by a
fund's investments.

Duration

A measure of the sensitivity of bond--and bond fund--prices to interest rate
movements. For example, if a bond has a duration of two years, its price would
fall by about 2% when interest rates rose one percentage point. On the other
hand, the bond's price would rise by about 2% when interest rates fell by one
percentage point.

Expense Ratio

The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any 12b-1
distribution fees.

Fixed-Income Securities

Investments, such as bonds, that have a fixed payment schedule. While the level
of income offered by these securities is predetermined, their prices may
fluctuate.

Fund Diversification

Holding a variety of securities so that a fund's return is not badly hurt by the
poor performance of a single security, industry, or country.

Investment Adviser

An organization that makes the day-to-day decisions regarding a fund's
investments.

Investment Grade

Bonds whose credit quality is considered to be among the highest by independent
bond-rating agencies.

Maturity

The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

Net Asset Value (NAV)

The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price.

Principal

The amount of your own money you put into an investment.

Total Return

A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

Volatility

The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

Yield

Income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price.


               25
<PAGE>
 
                                          [THE VANGUARD GROUP LOGO APPEARS HERE]
                                                Post Office Box 2600
                                                Valley Forge, PA 19482-2600

For More Information

If you'd like more information about Vanguard STAR Fund, the following documents
are available free upon request:

Annual/Semiannual Report to 
Shareholders

Additional information about the Fund's investments is available in the Fund's
annual and semiannual reports to shareholders. In these reports, you will find a
discussion of the market conditions and investment strategies that significantly
affected the Fund's performance during the most recent fiscal year.

Statement of Additional 
Information (SAI) 

The SAI provides more detailed information about the Fund.

The current annual and semiannual reports and the SAI are incorporated by
reference into (and are thus legally a part of) this prospectus.

To receive a free copy of the latest annual or semiannual report or the SAI, or
to request additional information about the Fund or other Vanguard funds, please
contact us as follows:

The Vanguard Group Investor Information Department P.O. Box 2600 Valley Forge,
PA 19482-2600

Telephone:
1-800-662-7447 (SHIP)

Text Telephone: 
1-800-952-3335

World Wide Web: www.vanguard.com

If you are a current Fund shareholder and would like information about your
account, account transactions, and/or account statements, please call:

Client Services Department 
Telephone: 
1-800-662-2739 (CREW)

Text Telephone: 
1-800-662-2738

Information provided by the Securities and Exchange Commission (SEC)

You can review and copy information about the Fund (including the SAI) at the
SEC's Public Reference Room in Washington, D.C. To find out more about this
public service, call the SEC at 1-800-SEC-0330. Reports and other information
about the Fund are also available on the SEC's website (www.sec.gov), or you can
receive copies of this information, for a fee, by writing the Public Reference
Section, Securities and Exchange Commission, Washington, DC 20549-6009.

Fund's Investment Company Act file number: 811-3919

(C) 1999 The Vanguard Group, Inc. All rights reserved.
Vanguard Marketing Corporation, Distributor.

                                      26
<PAGE>
 
Vanguard STAR Fund

Participant Prospectus 
April 30, 1999

A Balanced Mutual Fund

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

       Contents

1  Fund Profile

3  Additional Information

3  A Word About Risk

3  Who Should Invest

4  Primary Investment Strategies

9  The Fund and Vanguard

10 Investment Adviser

12 Year 2000 Challenge

12 Dividends, Capital Gains, and Taxes

12 Share Price

13 Financial Highlights

14 Investing with Vanguard

14 Accessing Fund Information by Computer

Glossary (inside back cover)

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

- --------------------------------------------------------------------------------
Why Reading This Prospectus Is Important

This prospectus explains the objective, risks, and strategies of Vanguard STAR
Fund. To highlight terms and concepts important to mutual fund investors, we
have provided "Plain Talk(R)" explanations along the way. Reading the
prospectus will help you to decide whether the Fund is the right investment for
you. We suggest that you keep it for future reference.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Important Note

This prospectus is intended for participants in employer-sponsored retirement or
savings plans. Another version--for investors who would like to open a personal
investment account--can be obtained by calling Vanguard at 1-800-662-7447.
- --------------------------------------------------------------------------------

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.
<PAGE>
                                                                               1

Fund Profile

The following profile summarizes key features of Vanguard STAR Fund.

INVESTMENT OBJECTIVE
    
The Fund is a balanced fund that seeks to provide long-term capital growth and
some income.
     
INVESTMENT STRATEGIES

As a "fund of funds," STAR Fund invests in a diversified group of nine other
Vanguard mutual funds, rather than in individual securities. The Fund follows a
balanced investment approach by placing 60% to 70% of its assets in six stock
funds; 20% to 30% of its assets in two bond funds; and 10% to 20% of its assets
in one money market fund.

PRIMARY RISKS
    
The Fund's total return, like the prices of stocks and bonds generally, will
fluctuate within a wide range, so an investor could lose money over short or
even long periods. The Fund is also subject to:

 .   Investment-style risk, which is the chance that returns from the stock
    market segments in which the Fund is most heavily weighted (large-cap and
    value stocks) may underperform other asset classes or the overall stock
    market. Each market segment tends to go through cycles of doing better--or
    worse--than the stock market in general. These periods have, in the past,
    lasted for as long as several years.
     
 .   Manager risk, which is the chance that poor security selection by the
    investment advisers of the underlying funds will cause the Fund to
    underperform other funds with similar investment objectives.

 .   Interest rate risk, which is the chance that bond prices overall will
    decline over short or even long periods due to rising interest rates.
    
 .   Call/Prepayment risk, which is the chance that during periods of falling
    interest rates, a bond issuer will repay a higher-yielding bond before its
    maturity date. Forced to reinvest the unanticipated proceeds at lower
    interest rates, the Fund would experience a decline in income.

 .   Credit risk, which is the chance that a bond issuer will fail to pay
    interest and principal in a timely manner, reducing the Fund's return.
    Credit risk should be low for the Fund.
     
PERFORMANCE/RISK INFORMATION
    
The bar chart and table below provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year over
a ten-year period. The table shows how the Fund's average annual returns for
one, five, and ten calendar years compare with those of a broad-based securities
market index and a composite stock/bond index weighted to match the Fund's
target allocation. Keep in mind that the Fund's past performance does not
indicate how it will perform in the future.     
    
- --------------------------------------------------------------------------------
                              Annual Total Returns
- --------------------------------------------------------------------------------

                           [BAR CHART APPEARS HERE]

1989   18.80%
1990   -3.62%
1991   24.18%
1992   10.51%
1993   10.88%
1994   -0.21%
1995   28.64%
1996   16.11%
1997   21.15%
1998   12.38%

- --------------------------------------------------------------------------------
 
     During the period shown in the bar chart, the highest return for a calendar
quarter was 12.30% (quarter ended March 31, 1991) and the lowest return for a
quarter was -10.71% (quarter ended September 30, 1990).
     

<PAGE>

2
     
- --------------------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
- --------------------------------------------------------------------------------
                                               1 Year    5 Years   10 Years
- --------------------------------------------------------------------------------
       Vanguard STAR Fund                      12.38%    15.20%    13.46%
       STAR Lipper Composite*                  11.30     12.69     12.33
       Wilshire 5000 Index                     23.39     21.78     18.10
       Lehman Brothers Aggregate
        Bond Index                              8.69      7.27      9.26  
- --------------------------------------------------------------------------------
*Weighted 62.5% Lipper General Equity, 25% Lipper Fixed Income, and 12.5% Lipper
Money Market.
- --------------------------------------------------------------------------------
     
                               PLAIN TALK ABOUT

                            The Costs of Investing

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with the fund's buying and selling of securities. These costs
can erode a substantial portion of the gross income or capital appreciation a
fund achieves. Even seemingly small differences in expenses can, over time, have
a dramatic effect on a fund's performance.

FEES AND EXPENSES
The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment)
Sales Charge (Load) Imposed on Purchases:                           None 
Sales Charge (Load) Imposed on Reinvested Dividends:                None 
Redemption Fees:                                                    None
Exchange Fees:                                                      None

    
Annual Fund Operating Expenses (expenses deducted from the underlying funds'
assets) 

Indirect Operating Expenses: 

*Although STAR Fund incurs no net expenses directly, the Fund's shareholders
indirectly bear the expenses of the underlying Vanguard funds in which the Fund
invests. See The Fund and Vanguard. The Fund's indirect expense ratio, based on
its investments in the underlying Vanguard funds, was 0.37% as of December 31,
1998.
     
   The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.
    
   -------------------------------------------------------------------------  
       1 Year             3 Years            5 Years            10 Years
   -------------------------------------------------------------------------  
        $38                $119                $207               $467
   -------------------------------------------------------------------------  
     
   This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.


<PAGE>
 
                                                                               3

Additional Information
    
Dividends and Capital Gains
Dividends are distributed in June and December; capital gains, if any, are
distributed annually in December 
     
Investment Adviser 
    
The Fund does not employ an investment adviser, but rather benefits from the
investment advisory services provided to the underlying Vanguard funds in which
it invests 
     
Inception Date 
March 29, 1985 
    
Net Assets as of December 31, 1998
$8.08 billion
     
Newspaper Abbreviation
STAR

Vanguard Fund Number
056

Cusip Number
921909107

Ticker Symbol
VGSTX

================================================================================

A Word About Risk

This prospectus describes the risks you would face as an investor in Vanguard
STAR Fund. It is important to keep in mind one of the main axioms of investing:
The higher the risk of losing money, the higher the potential reward. The
reverse, also, is generally true: The lower the risk, the lower the potential
reward. As you consider an investment in Vanguard STAR Fund, you should also
take into account your personal tolerance for the daily fluctuations of the
stock and bond markets.

  Look for this [GRAPHIC APPEARS HERE] symbol throughout the prospectus.
It is used to mark detailed information about each type of risk that you would
confront as a shareholder of the Fund.
================================================================================


Who Should Invest

The Fund may be a suitable investment for you if:

 . You wish to add a balanced fund to your existing holdings, which could include
  other stock and bond--as well as money market and tax-exempt--investments.

 . You are seeking growth of your capital over the long term--at least five
  years--without taking undue risk.

 . You are seeking moderate current income.


                               PLAIN TALK ABOUT

                            Costs and Market-Timing

  Some investors try to profit from market-timing--switching money into
  investments when they expect prices to rise, and taking money out when they
  expect the market to fall. As money is shifted in and out, a fund incurs
  expenses for buying and selling securities. These costs are borne by all fund
  shareholders, including the long-term investors who do not generate the costs.
  Therefore, the Fund discourages short-term trading by, among other things,
  limiting the number of exchanges it permits.

  The Vanguard funds do not permit market-timing. Do not invest in this Fund if
you are a market-timer.
<PAGE>
 
4

  The Fund has adopted the following policies, among others, to discourage
  short-term trading:

 . The Fund reserves the right to reject any purchase request--including
  exchanges from other Vanguard funds--that it regards as disruptive to the
  efficient management of the Fund. A purchase request could be rejected because
  of the timing of the request or because of a history of excessive trading by
  the investor.

 . There is a limit on the number of times you can exchange into and out of the
  Fund (see "Exchanges" in the Investing with Vanguard section).

 . The Fund reserves the right to stop offering shares at any time.

                               PLAIN TALK ABOUT

                                Balanced Funds

Balanced funds are generally "middle-of-the-road" investments that seek to
provide some combination of growth, income, and conservation of capital by
investing in a mix of stocks, bonds, and/or money market instruments. Because
the prices of stocks and bonds often move in different directions, balanced
funds are able to use rewards from one type of investment to help offset the
risks from another.

                               PLAIN TALK ABOUT

                   Large-Cap, Mid-Cap, and Small-Cap Stocks

Stocks of publicly traded companies--and mutual funds that hold these
stocks--can be classified by the companies' market value, or capitalization.
Generally, Vanguard defines large-capitalization (large-cap) funds as those
holding stocks of companies whose outstanding shares have a market value
exceeding $10 billion. Mid-cap funds hold stocks of companies with a market
value between $1 billion and $10 billion. Small-cap funds typically hold stocks
of companies with a market value of less than $1 billion.

Primary Investment Strategies
    
This section explains how the Fund pursues its objective, long-term growth of
capital and income. The Fund's Board of Trustees oversees the management of the
Fund, and may change the investment strategies in the interest of shareholders.
In addition, this section discusses several important risks faced by investors
in the Fund.
     
Market Exposure
    
Stocks
Through six underlying Vanguard funds, STAR Fund invests 60% to 70% of its
assets in common stocks. The Fund's indirect investment in stocks is designed to
provide long-term capital growth and some income. The underlying stock funds are
described on page 7.
     
[GRAPHIC APPEARS HERE]The Fund is subject to stock market risk, which is the
      possibility that stock prices overall will decline over short or even long
      periods. Stock markets tend to move in cycles, with periods of rising
      prices and periods of falling prices.

  To illustrate the volatility of stock prices, the following table shows the
best, worst, and average total returns for the U.S. stock market over various
periods as measured by the Standard & Poor's 500 Composite Stock Price Index, a
widely used barometer of stock market activity. (Total returns consist of
dividend income plus change in market price.) Note that the returns shown do not
include the costs of buying and selling stocks or other expenses that a
real-world investment portfolio would incur. Note, also, that the gap between
best and worst tends to narrow over the long term.
    
- --------------------------------------------------------------------------------
                     U.S. Stock Market Returns (1926-1998)
- --------------------------------------------------------------------------------
                 1 Year       5 Years     10 Years     20 Years
- --------------------------------------------------------------------------------
Best              54.2%        24.1%       19.9%        17.7%
Worst            -43.1        -12.4        -0.8          3.1
Average           13.1         10.7        11.0         11.0
- --------------------------------------------------------------------------------
     

<PAGE>
 
                                                                               5

   The table covers all of the 1-, 5-, 10-, and 20-year periods from 1926
through 1998. You can see, for example, that while the average return on stocks
for all of the 5-year periods was 10.7%, returns for individual 5-year periods
ranged from a -12.4% average (from 1928 through 1932) to 24.1% (from 1994
through 1998). These average returns reflect past performance on common stocks;
you should not regard them as an indication of future returns from either the
stock market as a whole or this Fund in particular.

   Because stock and bond prices can move in different directions or in
different amounts, the Fund's bond and money market fund holdings may help to
dampen--but will not eliminate--the volatility experienced by the Fund as a
result of its stock fund holdings.The Fund's balanced portfolio, in the long
run, should result in less investment risk--and a lower investment return--than
a fund investing exclusively in common stocks.
    
[GRAPHIC APPEARS HERE]The Fund is subject to investment-style risk, which is the
      possibility that returns from the stock market segments in which the Fund
      is most heavily weighted may underperform other asset classes or the
      overall stock market.     
    
   Through its share ownership of the underlying stock funds, STAR Fund
indirectly owns a diversified mixture of common stocks. Although its indirect
stock holdings are predominantly large-cap, the Fund has significant exposure to
mid-cap stocks and some exposure to small-cap stocks. Mid-cap and small-cap
stocks tend to be more volatile than large-cap stocks. The Fund's indirect stock
holdings are predominantly value-oriented, although the Fund has significant
exposure to growth stocks.     
    
Bonds
Through two underlying Vanguard funds, STAR Fund invests roughly 20% to 30% of
its assets in bonds, predominantly intermediate- and long-term bonds. The Fund's
indirect investment in bonds is designed to provide a high level of current
income with less price volatility than would be expected from the stock portion
of its holdings. The underlying bond funds are described on pages 7-8.     
    
[GRAPHIC APPEARS HERE]The Fund is subject to interest rate risk, which is the
      possibility that bond prices overall will decline over short or even long
      periods due to rising interest rates. Interest rate risk is modest for
      shorter-term bonds and higher for longer-term bonds.
     
   Although bonds are often thought to be less risky than stocks, there have
been periods when bond prices have fallen significantly due to rising interest
rates. For instance, prices of long-term bonds fell by almost 48% between
December 1976 and September 1981.

   To illustrate the relationship between bond prices and interest rates, the
following table shows the impact of a 2% change (both up and down) in interest
rates on three bonds of different maturities, each with a face value of $1,000.
    
- --------------------------------------------------------------------------------
                 How Interest Rate Changes Affect Bond Prices*
- --------------------------------------------------------------------------------
                               Value of a $1,000 Bond  Value of a $1,000 Bond
                                After a 2% Increase     After a 2% Decrease
Type of Bond (Maturity)          in Interest Rates       in Interest Rates
- --------------------------------------------------------------------------------

Short-Term (2.5 years)                 $956                    $1,046
Intermediate-Term (10 years)            870                     1,156
Long-Term (20 years)                    816                     1,251
- --------------------------------------------------------------------------------
*Assuming a 7% yield.
- --------------------------------------------------------------------------------
     
                               PLAIN TALK ABOUT

                           Bonds and Interest Rates

As a rule, when interest rates rise, bond prices fall. The opposite is also
true: Bond prices go up when interest rates fall. Why do bond prices and
interest rates move in opposite directions? Let's assume that you hold a bond
offering a 5% yield. A year later, interest rates are on the rise and bonds are
offered with a 6% yield. With higher-yielding bonds available, you would have
trouble selling your 5% bond for the price you paid--causing you to lower your
asking price. On the other hand, if interest rates were falling and 4% bonds
were being offered, you should be able to sell your 5% bond for more than you
paid.
<PAGE>
 
6

                               PLAIN TALK ABOUT

                                Bond Maturities
    
A bond is issued with a specific maturity date--the date when the bond's issuer,
or seller, must pay back the bond's initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30 years
(long-term). The longer a bond's maturity, the more risk you, as a bond
investor, face as interest rates rise--but also the more interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hope of higher yields; short-term bond investors should be willing to
accept lower yields in return for less fluctuation in the value of their
investment.     
    
   These figures are intended only to illustrate interest rate risk; they should
not be regarded as an indication of future returns from the bond market as a
whole, or STAR Fund in particular. Also, changes in interest rates may not have
as dramatic an effect on the Fund as they would on a fund made up entirely of
bonds.     
    
[GRAPHIC APPEARS HERE]The Fund is subject to credit risk, which is the
      possibility that a bond issuer will fail to pay interest and principal in
      a timely manner.
     
   Since the underlying Vanguard bond funds invest in high-quality obligations,
credit risk is relatively low.
    
[GRAPHIC APPEARS HERE]The Fund is also subject to call risk (in the case of
      corporate bonds) and prepayment risk (in the case of mortgage-backed
      bonds), which is the possibility that during periods of falling interest
      rates a bond issuer will repay a higher-yielding bond before its maturity
      date. Forced to reinvest the unanticipated proceeds at lower interest
      rates, the Fund would experience a decline in income.     
    
Money Market Instruments
Through one underlying Vanguard fund, STAR Fund invests roughly 10% to 20% of
its assets in high-quality money market instruments. From this investment, the
Fund seeks to provide a high level of current income while maintaining stability
of principal for this portion of its holdings.

   The underlying money market fund is subject to a high level of income risk,
which is the possibility that dividends will fall if short-term interest rates
fall, and a low level of credit risk, which is the chance that an issuer of a
money market instrument will fail to pay interest or repay principal in a timely
manner. Because the Fund does not invest heavily in the money market fund,
however, both income risk and credit risk to STAR Fund will be low.
     
    
Security Selection
Vanguard STAR Fund is a "fund of funds," which means that it achieves its
objective by investing in a combination of other mutual funds rather than in
individual securities.
   Decisions about how to allocate STAR Fund's assets among the underlying funds
are made by the Trustees of the Fund based on the Fund's investment objective
and policies. Generally, the Fund invests 60% to 70% of its assets in stock
funds, 20% to 30% in bond funds, and 10% to 20% in a money market fund. While
these allocations may shift from time to time, stocks can be expected to
represent at least 60% of the Fund's holdings at any given time.
     
                               PLAIN TALK ABOUT

                                "Fund of Funds"

The term "fund of funds" is used to describe a mutual fund that pursues its
objective by investing in other mutual funds rather than in individual stocks or
bonds. A fund of funds may charge for its own direct expenses, in addition to
bearing a proportionate share of the expenses charged by the underlying funds in
which it invests. Funds of funds are best suited for long-term investors.
<PAGE>
 
                                                                               7
    
[GRAPHIC APPEARS HERE]The Fund is subject to manager risk, which is the
      possibility that the investment advisers of the underlying funds may do a
      poor job of selecting securities.
     
   The underlying Vanguard funds are run by their investment advisers according
to traditional methods of active investment management. This means that
securities are bought and sold according to the advisers' judgments about
companies and their financial prospects, about issuers of bonds and money market
instruments, and about the general level of interest rates.

   The Fund is generally managed without regard to tax ramifications.


Stocks
    
STAR Fund invests in the following stock funds, in approximately the percentages
indicated:

1. Vanguard Windsor II Fund (27%)
2. Vanguard Windsor Fund (16%)
3. Vanguard Explorer Fund (5%)
4. Vanguard Morgan Growth Fund (5%)
5. Vanguard PRIMECAP Fund (5%)
6. Vanguard U.S. Growth Fund (5%)     
         
    
   Vanguard Windsor Fund and Vanguard Windsor II Fund are value-oriented funds,
chosen primarily for their potential for long-term capital growth, as well as
for their current income-producing capabilities. They work toward these goals by
investing in large- and medium-size companies believed by the adviser to be
undervalued when purchased. These stocks typically--but not always--have
lower-than-average price/earnings ratios and higher-than-average dividend
yields.     
    
   Vanguard Morgan Growth Fund, Vanguard PRIMECAP Fund, and Vanguard U.S. Growth
Fund are growth funds and Vanguard Explorer Fund is an aggressive growth fund.
These funds are held by STAR Fund primarily to provide long-term capital growth.
They work in different ways to achieve this goal.

 .  Vanguard Explorer Fund invests in common stocks of small, unseasoned U.S.
   companies with higher risk characteristics but, in the advisers' opinion,
   above-average prospects for growth.

 .  Vanguard Morgan Growth Fund invests mainly in stocks of U.S. growth
   companies. The majority of the fund's assets are invested in "established"
   companies that have above-average growth rates over the long term; the
   remainder are invested in "emerging" companies that have potential for
   continued growth, but at slower rates.

 .  Vanguard PRIMECAP Fund invests in stocks of large and medium size U.S.
   companies that have past records of growth and, in the adviser's opinion,
   above-average prospects for continued growth.

 .  Vanguard U.S. Growth Fund invests in stocks of large, seasoned U.S. companies
   that have past records of growth and, in the adviser's opinion, above-average
   prospects for continued growth.

   Although there are no present plans to do so, the Fund also is authorized to
invest in Vanguard 500 Index Fund, which tracks the performance of the S&P 500
Index.     

Bonds
    
STAR Fund invests in two bond funds, in approximately the percentages indicated:

1. Vanguard GNMA Fund (12.5%)
2. Vanguard Long-Term Corporate Fund (12.5%)     

   Both bond funds seek to provide a high and stable level of income. They work
toward this goal, however, in different ways:

                               PLAIN TALK ABOUT

                                Types of Bonds
    
Bonds are issued (sold) by many sources: Corporations issue corporate bonds; the
federal government issues U.S. Treasury bonds; agencies of the federal
government issue agency bonds; and mortgage holders issue "mortgage-backed"
bonds such as those issued by the Government National Mortgage Association
(GNMA). Each issuer is responsible for paying back the bond's initial value as
well as making periodic interest payments.
     
<PAGE>
 
8

                               PLAIN TALK ABOUT

                                Credit Quality

  A bond's credit quality depends on the issuer's ability to pay interest on the
  bond and, ultimately, to repay the debt. The lower the rating by one of the
  independent bond-rating agencies (for example, Moody's or Standard & Poor's),
  the greater the chance (in the rating agency's opinion) that the bond issuer
  will default, or fail to meet its payment obligations. All things being equal,
  the lower a bond's credit rating, the higher its yield should be to compensate
  investors for assuming additional risk.
    
 . Vanguard GNMA Fund invests at least 80% of its assets in mortgage-backed bonds
  issued by the Government National Mortgage Association. The bonds offer a U.S.
  government guarantee of timely principal and interest payments, along with
  income that usually exceeds that of comparable U.S. Treasury securities. The
  fund's average weighted maturity depends on homeowner prepayments of the
  underlying mortgages, but normally falls within an intermediate-term range
  (5 to 10 years).

 . Vanguard Long-Term Corporate Fund invests in a diversified group of
  investment-grade corporate bonds--that is, bonds issued by corporations that
  are rated at least Baa by Moody's Investors Service, Inc., or BBB by Standard
  & Poor's Corporation. The fund maintains an average weighted maturity of 15 to
  25 years.

Money Market Instruments
STAR Fund invests in one money market fund, Vanguard Prime Money Market Fund.
Prime Money Market Fund invests in high-quality, short-term money market
instruments rated in one of the two highest credit quality categories. STAR Fund
invests approximately 12% of its assets in Prime Money Market Fund.

   Note: On June 30, 1998, the shareholders of STAR Fund authorized the Fund to
purchase shares of Vanguard Short-Term Corporate Fund, in addition to or in lieu
of Prime Money Market Fund, for the Fund's cash reserve investment. Short-Term
Corporate Fund invests primarily in high-quality corporate bonds with an average
maturity between one and three years. The fund is subject to a lower level of
income risk and a higher level of credit risk than Prime Money Market Fund. In
addition, Short-Term Corporate Fund is subject to interest rate risk, although
this risk is low because the fund holds short-term bonds. Overall, Short-Term
Corporate Fund is riskier than Prime Money Market Fund, but it also should
provide a slightly higher return.
     
         
Other Investment Policies and Risks
The Fund's underlying funds may invest, to a limited extent, in foreign
securities.
    
   The Fund's underlying funds may, from time to time, take temporary defensive
measures--such as holding cash reserves without limit--that are inconsistent
with the funds' primary investment strategies, in response to adverse market,
economic, political, or other conditions. If one or more of the underlying funds
takes temporary defensive measures, STAR Fund may not achieve its investment
objective.
     
                               PLAIN TALK ABOUT

                     Vanguard's Unique Corporate Structure

   The Vanguard Group is truly a mutual mutual fund company. It is owned jointly
   by the funds it oversees and thus indirectly by the shareholders in those
   funds. Most other mutual funds are operated by for-profit management
   companies that may be owned by one person, by a group of individuals, or by
   investors who own the management company's stock. By contrast, Vanguard
   provides its services on an "at-cost" basis, and the funds' expense ratios
   reflect only these costs. No separate management company reaps profits or
   absorbs losses from operating the funds.
<PAGE>
 
                                                                               9
    
The Fund and Vanguard

STAR Fund has entered into an agreement with Vanguard under which Vanguard
provides all management, administrative, and distribution services to the Fund
at cost. The Fund pays Vanguard a sum sufficient to cover Vanguard's
out-of-pocket costs. The Fund also bears the expenses of services provided by
other parties (such as auditors, legal counsel, and the Fund's custodian), as
well as taxes and other direct expenses of the Fund. However, the agreement
provides that the Fund's expenses will be offset by reimbursements from Vanguard
for (a) contributions made by the Fund to the cost of operating the underlying
Vanguard funds in which STAR Fund invests, and (b) certain savings in
administrative and marketing costs that Vanguard is expected to derive from the
operation of the Fund.
     
   The Fund's Trustees believe that the reimbursements should be sufficient to
offset most, if not all, of the expenses incurred by the Fund. Therefore, the
Fund is expected to operate at a very low or zero expense ratio. Since its
inception in 1985, the Fund in fact has had no direct net expenses.
  
   Of course, shareholders of STAR Fund will still bear, indirectly, their
proportionate share of the costs of operating the underlying Vanguard funds. The
following chart provides the expense ratio for each of the underlying funds
during STAR Fund's 1998 fiscal year, as well as the percentage of STAR Fund's
net assets invested in each fund as of December 31, 1998:

                               PLAIN TALK ABOUT

                                 Fund Expenses
    
All mutual funds have operating expenses. These expenses, which are deducted
from a fund's gross income, are expressed as a percentage of the net assets of
the fund. STAR Fund's indirect expense ratio in fiscal year 1998 was 0.37%, or
$3.70 per $1,000 of average net assets. The average balanced mutual fund had
expenses in 1998 of 1.31%, or $13.10 per $1,000 of average net assets, according
to Lipper Inc., which reports on the mutual fund industry.     
    
      ---------------------------------------------------------------------
                                                              Percentage of
                                             Expense           STAR Fund's
      Underlying Fund                         Ratio            Net Assets
      ---------------------------------------------------------------------
      Windsor II Fund                         0.41%              27.3%
      Windsor Fund                            0.27               15.4
      PRIMECAP Fund                           0.51                5.1
      U.S. Growth Fund                        0.41                5.1
      Morgan Growth Fund                      0.44                5.2
      Explorer Fund                           0.62                5.3
      GNMA Fund                               0.30               12.3
      Long-Term Corporate Fund                0.30               12.5
      Prime Money Market Fund                 0.33               11.8
      ---------------------------------------------------------------------
                                                                 100.0%
      ---------------------------------------------------------------------
     
    
   Based on these figures, the indirect expense ratio for STAR Fund's underlying
investments on December 31, 1998 was 0.37%. Vanguard expects the Fund's indirect
expense ratio in 1999 to remain at or about 0.37%.
     

<PAGE>
 
10

Investment Adviser

STAR Fund does not employ an investment adviser. Rather decisions about how its
assets will be invested in the underlying funds are made by the Fund's Board of
Trustees based on the Fund's investment objective and policies. Of course, the
Fund benefits from the investment advisory services rendered to the underlying
funds. Some of the underlying funds employ one investment advisory firm, while
others have as many as four.

   The chart below lists the investment advisory firms employed by each
underlying fund:
    
      --------------------------------------------------------------------------
      Underlying Fund                  Investment Adviser
      --------------------------------------------------------------------------
      Vanguard Windsor Fund            Wellington Management Company, LLP
                                       Sanford C. Bernstein & Company*
      --------------------------------------------------------------------------
      Vanguard Windsor II Fund         Barrow, Hanley, Mewhinney & Strauss, Inc.
                                       Equinox Capital Management, Inc. 
                                       Tukman Capital Management, Inc.
                                       Vanguard Core Management Group
      --------------------------------------------------------------------------
      Vanguard Morgan Growth Fund      Franklin Portfolio Associates, LLC
                                       Vanguard Core Management Group 
                                       Wellington Management Company, LLP
      --------------------------------------------------------------------------
      Vanguard U.S. Growth Fund        Lincoln Capital Management Company
      --------------------------------------------------------------------------
      Vanguard PRIMECAP Fund           PRIMECAP Management Company
      --------------------------------------------------------------------------
      Vanguard Explorer Fund           Granahan Investment Management, Inc. 
                                       Wellington Management Company, LLP
                                       Chartwell Investment Partners 
                                       Vanguard Core Management Group
      --------------------------------------------------------------------------
      Vanguard GNMA Fund               Wellington Management Company, LLP 
      --------------------------------------------------------------------------
      Vanguard Long-Term 
      Corporate Fund                   Wellington Management Company, LLP 
      --------------------------------------------------------------------------
      Vanguard Prime Money 
      Market Fund                      Vanguard Fixed Income Group 
      --------------------------------------------------------------------------
      *Windsor Fund's Board of Trustees has decided to add Sanford C. Bernstein
      & Company as a co-adviser of the fund, effective June 1, 1999.
      --------------------------------------------------------------------------
     

<PAGE>
 
                                                                              11

The chart below briefly describes each investment advisory firm:

<TABLE> 
<CAPTION> 
    
      --------------------------------------------------------------------------------
      Firm                                  Background
      --------------------------------------------------------------------------------
     <S>                                   <C>      
      Wellington Management Company, LLP    Based in Boston, Massachusetts
                                            Founded in 1928 
                                            Manages more than $209 billion in assets
      --------------------------------------------------------------------------------
      Sanford C. Bernstein & Company        Based in New York, New York 
                                            Founded in 1968 
                                            Manages more than $78 billion in assets
      --------------------------------------------------------------------------------
      Barrow, Hanley, Mewhinney &           Based in Dallas, Texas 
      Strauss, Inc.                         Founded in 1979 
                                            Manages more than $36 billion in assets
      --------------------------------------------------------------------------------
      Equinox Capital Management, Inc.      Based in New York, New York 
                                            Founded in 1989 
                                            Manages more than $12 billion in assets
      --------------------------------------------------------------------------------
      Tukman Capital Management, Inc.       Based in Larkspur, California 
                                            Founded in 1980 
                                            Manages more than $7.9 billion in assets
     --------------------------------------------------------------------------------
      Franklin Portfolio Associates, LLC    Based in Boston, Massachusetts
                                            Founded in 1982 
                                            Manages more than $18 billion in assets
      --------------------------------------------------------------------------------
      Lincoln Capital Management Company    Based in Chicago, Illinois 
                                            Founded in 1967 
                                            Manages more than $62 billion in assets
      --------------------------------------------------------------------------------
      PRIMECAP Management Company           Based in Pasadena, California 
                                            Founded in 1983 
                                            Manages more than $15 billion in assets
      --------------------------------------------------------------------------------
      Granahan Investment                   Based in Waltham, Massachusetts 
        Management, Inc.                    Founded in 1985 
                                            Manages more than $1.3 billion in assets     
      --------------------------------------------------------------------------------
      Chartwell Investment Partners         Based in Berwyn, Pennsylvania 
                                            Founded in 1997 
                                            Manages more than $2.7 billion in assets
      --------------------------------------------------------------------------------
      Vanguard Core Management Group        Based in Valley Forge, Pennsylvania 
                                            Founded in 1974 
                                            Manages more than $147 billion in assets
      --------------------------------------------------------------------------------
      Vanguard Fixed Income Group           Based in Valley Forge, Pennsylvania
                                            Founded in 1974 
                                            Manages more than $127 billion in assets
      --------------------------------------------------------------------------------
</TABLE> 
   The Board of Trustees of an underlying fund may, without prior approval from
shareholders of the underlying fund or STAR Fund, change the terms of any
advisory agreement or hire a new investment adviser, either as a replacement
for an adviser or as an additional adviser.
     
<PAGE>
 
12

Year 2000 Challenge

The common practice in computer programming of using just two digits to identify
a year has resulted in the Year 2000 challenge throughout the information
technology industry. If unchanged, many computer applications and systems could
misinterpret dates occurring after December 31, 1999, leading to errors or
failure. Such failure could adversely affect a fund's operations, including
pricing, securities trading, and the servicing of shareholder accounts.
     The Vanguard Group is dedicated to providing uninterrupted, high-quality
performance from our computer systems before, during, and after 2000. In July
1998, we completed the renovation and initial testing of our internal systems.
Vanguard is diligently working with external partners, suppliers, and vendors,
including fund managers and other service providers, to assure that the systems
with which we interact remain operational at all times.
     In addition to taking every reasonable step to secure our internal systems
and external relationships, Vanguard is further developing contingency plans
intended to assure that unexpected systems failures will not adversely affect
the Fund's operations. Vanguard intends to monitor these processes through the
rollover of 1999 into 2000 and to quickly implement alternate solutions if
necessary.
     However, despite Vanguard's efforts and contingency plans, noncompliant
computer systems could have a material adverse effect on the Fund's business,
operations, or financial condition. Additionally, the Fund's performance could
be hurt if a computer-system failure at a company or governmental unit affects
the price of securities the Fund's underlying funds own.

Dividends, Capital Gains, and Taxes
    
The Fund distributes to shareholders virtually all of its net income (interest
and dividends paid by the underlying funds) as well as any capital gains
realized from the sale of its holdings or received as capital gains
distributions from the underlying funds. Income distributions generally occur in
June and December; capital gains distributions generally occur in December. In
addition, the Fund may occasionally be required to make supplemental income or
capital gains distributions at some other time during the year.     
     Dividend and capital gains distributions of Fund shares that are held as an
investment option in an employer-sponsored retirement or savings plan will be
reinvested in additional Fund shares and accumulate on a tax-deferred basis. You
will not owe taxes on these distributions until you begin withdrawals. You
should consult your plan administrator, your plan's Summary Plan Description, or
your own tax adviser about the tax consequences of an investment in the Fund and
of any plan withdrawals.


Share Price
    
The Fund's share price, called its net asset value, or NAV, is calculated each
business day after the close of trading on the New York Stock Exchange (the NAV
is not calculated on holidays or other days the Exchange is closed). Net asset
value per share is computed by adding up the total value of the Fund's
investments (i.e., shares of the underlying Vanguard funds) and other assets,
subtracting any of its liabilities (debts), and then dividing by the number of
Fund shares outstanding:
     
                                           Total Assets - Liabilities 
                    Net Asset Value = ---------------------------------------
                                           Number of Shares Outstanding

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the number of shares you own, gives you the dollar amount you would have
received had you sold all of your shares back to the Fund that day.
         
     The Fund's share price can be found daily in the mutual fund listings of
most major newspapers under the heading "Vanguard Funds." Different newspapers
use different abbreviations of the Fund's name, but the most common is STAR.
<PAGE>
 
                                                                              13

Financial Highlights

The following financial highlights table is intended to help you understand the
Fund's financial performance for the past five years, and certain information
reflects financial results for a single Fund share. The total returns in the
table represent the rate that an investor would have earned or lost each year on
an investment in the Fund (assuming reinvestment of all dividends and
distributions). This information has been derived from the financial statements
audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along with the Fund's financial statements--is included in the Fund's
most recent annual report to shareholders. You may have the annual report sent
to you without charge by contacting Vanguard.

<TABLE>    
<CAPTION>
- -----------------------------------------------------------------------------------------------
                                                             Vanguard STAR Fund
                                                           Year Ended December 31,
                                              -------------------------------------------------   
                                                1998      1997      1996       1995       1994
- -----------------------------------------------------------------------------------------------
<S>                                           <C>       <C>       <C>        <C>        <C>   
Net Asset Value, Beginning of Year            $17.38    $15.86    $15.03     $12.61     $13.41
- -----------------------------------------------------------------------------------------------
Investment Operations
  Net Investment Income                          .58       .60       .58       .590        .53
  Capital Gains Distributions Received           .86      1.06       .63       .435        .26
  Net Realized and Unrealized
    Gain (Loss) on Investments                   .70      1.65      1.19      2.550       (.82)
                                              -------------------------------------------------   
    Total from Investment Operations            2.14      3.31      2.40      3.575       (.03)
                                              -------------------------------------------------   
Distributions
  Dividends from Net Investment Income          (.58)     (.59)     (.59)     (.590)      (.52)
  Distributions from Realized Capital Gains     (.98)    (1.20)     (.98)     (.565)      (.25)
                                              -------------------------------------------------   
    Total Distributions                        (1.56)    (1.79)    (1.57)    (1.155)      (.77)
                                              -------------------------------------------------   
Net Asset Value, End of Year                  $17.96    $17.38    $15.86     $15.03     $12.61
===============================================================================================

Total Return                                   12.38%    21.15%    16.11%     28.64%     -0.21%
===============================================================================================

Ratios/Supplemental Data
  Net Assets, End of Year (Millions)          $8,083    $7,355    $5,863     $4,842     $3,766
  Ratio of Total Expenses to
    Average Net Assets                             0%        0%        0%         0%         0%
  Ratio of Net Investment Income to
    Average Net Assets                          3.18%     3.46%     3.71%      4.12%      4.01%
  Turnover Rate                                   16%       15%       18%        13%         9%
===============================================================================================
</TABLE>     

     From time to time, the Vanguard funds advertise yield and total return
figures. Yield is a measure of past dividend income. Total return includes both
past dividend income (assuming that it has been reinvested) plus realized and
unrealized capital appreciation (or depreciation). Neither yield nor total
return should be used to predict the future performance of a fund.

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

                                PLAIN TALK ABOUT

                   How to Read the Financial Highlights Table
    
The Fund began fiscal 1998 with a net asset value (price) of $17.38 per share.
During the year, the Fund earned $.58 per share from investment income, $.86 per
share in capital gains distributions, and $.70 per share from investments that
had appreciated in value or that were sold for higher prices than the Fund paid
for them.
   Shareholders received $1.56 per share in the form of dividend and capital
gains distributions. A portion of each year's distributions may come from the
prior year's income or capital gains.
   The earnings ($2.14 per share) minus the distributions ($1.56 per share)
resulted in a share price of $17.96 at the end of the year. This was an increase
of $.58 per share (from $17.38 at the beginning of the year to $17.96 at the end
of the year). For a shareholder who reinvested the distributions in the purchase
of more shares, the total return from the Fund was 12.38% for the year.
   As of December 31, 1998, the Fund had $8.08 billion in net assets. For the
year, its net investment income amounted to 3.18% of its average net assets; and
it sold and replaced securities valued at 16% of its net assets.     

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

"Standard & Poor's(R)," "S&P(R)," "S&P 500(R)," "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.
<PAGE>
 
14

Investing with Vanguard

The Fund is an investment option in your retirement or savings plan. Your plan
administrator or your employee benefits office can provide you with detailed
information on how to participate in your plan and how to elect the Fund as an
investment option.
 .   If you have any questions about the Fund or Vanguard, including the Fund's
    investment objective, strategies, or risks, contact Vanguard's Participant
    Services Center, toll-free, at 1-800-523-1188.
 .   If you have questions about your account, contact your plan administrator or
    the organization that provides record-keeping services for your plan.

Investment Options and Allocations
Your plan's specific provisions may allow you to change your investment
selections, the amount of your contributions, or how your contributions are
allocated among the investment choices available to you. Contact your plan
administrator or employee benefits office for more details.

Transactions
Contributions, exchanges, or redemptions of the Fund's shares are processed as
soon as they have been received by Vanguard in good order. Good order means that
your request includes complete information on your contribution, exchange, or
redemption, and that Vanguard has received the appropriate assets.
    
   In all cases, your transaction will be based on the Fund's next-determined
net asset value after Vanguard receives your request (or, in the case of new
contributions, the next-determined net asset value after Vanguard receives the
order from your plan administrator). As long as this request is received before
the close of trading on the New York Stock Exchange, generally 4 p.m. Eastern
time, you will receive that day's net asset value.     

Exchanges
The exchange privilege (your ability to redeem shares from one fund to purchase
shares of another fund) may be available to you through your plan. Although we
make every effort to maintain the exchange privilege, Vanguard reserves the
right to revise or terminate this privilege, limit the amount of an exchange or
reject any exchange, at any time, without notice. Because excessive exchanges
can potentially disrupt the management of the Fund and increase its transaction
costs, Vanguard limits participant exchange activity to no more than four
substantive "round trips" through the Fund (at least 90 days apart) during any
12-month period. A "round trip" is a redemption from the Fund followed by a
purchase back into the Fund. "Substantive" means a dollar amount that Vanguard
determines, in its sole discretion, could adversely affect the management of the
Fund.
  Before making an exchange to or from another fund available in your plan,
consider the following:
 .   Certain investment options, particularly funds made up of company stock or
    investment contracts, may be subject to unique restrictions.
 .   Make sure to read that fund's prospectus. Contact Participant Services,
    toll-free, at 1-800-523-1188 for a copy.
 .   Vanguard can accept exchanges only as permitted by your plan. Contact your
    plan administrator for details on the exchange policies that apply to your
    plan.


Accessing Fund Information by Computer

- --------------------------------------------------------------------------------
Vanguard on the World Wide Web www.vanguard.com
Use your personal computer to visit Vanguard's education-oriented website, which
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.
- --------------------------------------------------------------------------------
<PAGE>
 
                     (This page intentionally left blank.)
<PAGE>
 
                     (This page intentionally left blank.)
<PAGE>
 
Glossary of Investment Terms

Balanced Fund
A mutual fund that seeks to provide some combination of income, capital growth,
and conservation of capital by investing in stocks, bonds, and/or money market
instruments.

Bond
A debt security (IOU) issued by a corporation, government, or government agency
in exchange for the money you lend it. In most instances, the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

Capital Gains Distribution
Payment to mutual fund shareholders of gains realized on securities that the
fund has sold at a profit, minus any realized losses.

Cash Reserves
Cash deposits, short-term bank deposits, and money market instruments which
include U.S. Treasury bills, bank certificates of deposit (CDs), repurchase
agreements, commercial paper, and banker's acceptances.

Common Stock
A security representing ownership rights in a corporation. A stockholder is
entitled to share in the company's profits, some of which may be paid out as
dividends.
    
Credit Quality
A measure of a bond issuer's ability to pay interest and principal in a timely
manner.
     
Dividend Income
Payment to shareholders of income from interest or dividends generated by a
fund's investments.

Duration
A measure of the sensitivity of bond--and bond fund--prices to interest rate
movements. For example, if a bond has a duration of two years, its price would
fall by about 2% when interest rates rose one percentage point. On the other
hand, the bond's price would rise by about 2% when interest rates fell by one
percentage point.

Expense Ratio
The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any 12b-1
distribution fees.

Fixed-Income Securities
Investments, such as bonds, that have a fixed payment schedule. While the level
of income offered by these securities is predetermined, their prices may
fluctuate.

Fund Diversification
Holding a variety of securities so that a fund's return is not badly hurt by the
poor performance of a single security, industry, or country.

Investment Adviser
An organization that makes the day-to-day decisions regarding a fund's
investments.

Investment Grade
Bonds whose credit quality is considered to be among the highest by independent
bond-rating agencies.

Maturity
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

Net Asset Value (NAV)
The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price.

Principal
The amount of your own money you put into an investment.

Total Return
A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

Volatility
The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

Yield
Income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price.
<PAGE>
 
                                  [LETTERHEAD OF VANGUARD GROUP(R) APPEARS HERE]

For More Information

If you'd like more information about Vanguard STAR Fund, the following documents
are available free upon request:

Annual/Semiannual Report to Shareholders 

Additional information about the Fund's investments is available in the Fund's
annual and semiannual reports to shareholders. In these reports, you will find a
discussion of the market conditions and investment strategies that significantly
affected the Fund's performance during the most recent fiscal year.

Statement of Additional Information (SAI) 

The SAI provides more detailed information about the Fund.

The current annual and semiannual reports and the SAI are incorporated by
reference into (and are thus legally a part of) this prospectus.

To receive a free copy of the latest annual or semiannual report or the SAI, or
to request additional information about the Fund or other Vanguard funds, please
contact us as follows:

The Vanguard Group Participant Services Center
P.O. Box 2900 Valley Forge, PA 19482-2900

Telephone: 1-800-523-1188

Text Telephone: 1-800-523-8004

World Wide Web: www.vanguard.com

Information provided by the Securities and Exchange Commission (SEC) 
You can review and copy information about the Fund (including the SAI) at the
SEC's Public Reference Room in Washington, D.C. To find out more about this
public service, call the SEC at 1-800-SEC-0330. Reports and other information
about the Fund are also available on the SEC's website (www.sec.gov), or you can
receive copies of this information, for a fee, by writing the Public Reference
Section, Securities and Exchange Commission, Washington, DC 20549-6009.

Fund's Investment Company Act file number: 811-3919
<PAGE>
 
Vanguard LifeStrategy Funds

Prospectus
April 30, 1999

A Group of Balanced Mutual Funds

     Contents

1 Fund Profiles                                22 Financial Highlights
                                      
   1  Vanguard LifeStrategy Income Fund        25 Investing with Vanguard
   4  Vanguard LifeStrategy Conservative
      Growth Fund                              25 Services and Account Features
   7  Vanguard LifeStrategy Moderate Growth
      Fund                                     26 Types of Accounts 
   10 Vanguard LifeStrategy Growth Fund   
                                               26 Buying Shares
13 More on the Funds                  
                                               28 Redeeming Shares
18 The Funds and Vanguard             
                                               31 Transferring Registration
19 Investment Adviser                 
                                               31 Fund and Account Updates
19 Year 2000 Challenge                
                                               Glossary (inside back cover)
20 Dividends, Capital Gains, and Taxes
                                                                        
21 Share Price                        
                                      
- --------------------------------------------------------------------------------

   Why Reading This Prospectus Is Important

   This prospectus explains the objective, risks, and strategies of each of the
   Vanguard LifeStrategy Funds. To highlight terms and concepts important to
   mutual fund investors, we have provided "Plain Talk(R)" explanations along
   the way. Reading the prospectus will help you to decide which Fund, if any,
   is the right investment for you. We suggest that you keep it for future
   reference.

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



Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.
<PAGE>
 
                                                                               1
    
     This prospectus provides information about the Vanguard LifeStrategy Funds,
a group of balanced mutual funds that invest a fixed percentage of assets in up
to five other Vanguard stock and bond mutual funds. Because they invest in other
funds, rather than in individual securities, each Fund is considered a "fund of
funds." The allocation to stocks and bonds in each LifeStrategy Fund reflects
its greater or lesser orientation toward income and growth of capital. The
profiles below summarize each Fund's objective and other key features. Following
the profiles, there is important additional information about the Funds.      

                               PLAIN TALK ABOUT
    
                                 Fund of Funds      

The term "fund of funds" is used to describe a mutual fund that pursues its
objective by investing in other mutual funds rather than in individual stocks or
bonds. A fund of funds may charge for its own direct expenses, in addition to
bearing a proportionate share of the expenses charged by the underlying funds in
which it invests. Funds of funds are best suited for long-term investors.

Fund Profile--Vanguard LifeStrategy Income Fund
    
The following profile summarizes key features of Vanguard LifeStrategy Income
Fund.      

Investment Objective
The Fund seeks to provide current income and some growth of capital.

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 80% of assets to bonds and 20%
to common stocks. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows:

 . Vanguard Total Bond Market Index Fund  50%

 . Vanguard Asset Allocation Fund         25%

 . Vanguard Short-Term Corporate Fund     20%

 . Vanguard Total Stock Market Index Fund  5%

Primary Risks

The Fund's total return, like bond and stock prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be moderate.

 .    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate.

 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its higher-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low to moderate.

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing an underlying fund's
     return. Credit risk should be low. 

 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be low.      




<PAGE>
 
2

Fund Profile--Vanguard LifeStrategy Income Fund (continued)

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Income Fund to underperform other
     funds with similar investment objectives.

Performance/Risk Information
    
The bar chart and table below provide an indication of the risks of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception. The table shows how the Fund's average annual returns for one
calendar year and since inception compare with those of a broad-based bond
market index and a composite stock/bond index weighted to match the Fund's
target allocation. Keep in mind that the Fund's past performance does not
indicate how it will perform in the future.

        --------------------------------------------------------------
                             Annual Total Returns
        --------------------------------------------------------------

                                1995    22.99%
                                1996     7.65%
                                1997    14.23%
                                1998    13.17% 


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

     During the period shown in the bar chart, the highest return for a calendar
quarter was 6.93% (quarter ended June 30, 1995) and the lowest return for a
quarter was -0.01% (quarter ended March 31, 1996).      

        --------------------------------------------------------------
    
        Average Annual Total Returns for Years Ended December 31, 1998
        --------------------------------------------------------------
                                            1 Year     Since Inception*
        --------------------------------------------------------------
         Vanguard LifeStrategy Income Fund   13.17%          13.53%
         Lehman Aggregate Bond Index          8.69            9.46
         Income Composite Index**            11.22           11.91
         --------------------------------------------------------------
           *September 30, 1994.
          **Derived by applying the Fund's target allocation to the 
            results of the following benchmarks: for U.S. stocks, the 
            Wilshire 5000 Equity Index; for bonds, the Lehman Brothers 
            Aggregate Bond Index; and for cash reserves, the Salomon 
            Smith Barney 3-Month U.S. Treasury Bill Index.      
         --------------------------------------------------------------
 
Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

        Shareholder Fees (fees paid directly from your investment)
        Sales Charge (Load) Imposed on Purchases:                           None
        Sales Charge (Load) Imposed on Reinvested Dividends:                None
        Redemption Fees:                                                    None
        Exchange Fees:                                                      None


<PAGE>

     
                                                                               3
     Annual Fund Operating Expenses (expenses deducted from the underlying
     funds' assets)

     Indirect Operating Expenses:                                           *

     *Although the Fund incurs no net expenses directly, the Fund's shareholders
      indirectly bear the expenses of the underlying Vanguard funds in which the
      Fund invests. See The Funds and Vanguard. The Fund's indirect expense
      ratio, based on its investments in the underlying Vanguard funds, was
      0.29% as of December 31, 1998. 
     
     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.
    
         --------------------------------------------------------------
               1 Year      3 Years       5 Years       10 Years
         --------------------------------------------------------------
                $30          $93          $163           $368
         --------------------------------------------------------------
     
     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information

Dividends and Capital Gains                          
    
Dividends are distributed quarterly in March, June, September, and December;
capital gains, if any, are distributed annually in December
     
Investment Adviser
                                                                 
The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests
                                                                 
Inception Date

September 30, 1994
                                                                     
Net Assets as of December 31, 1998

$449 million
                                                                      
Suitable for IRAs

Yes

Minimum Initial Investment

$3,000; $1,000 for IRAs and custodial accounts for minors

Newspaper Abbreviation

LifeInc

Vanguard Fund Number

723
                        
Cusip Number

921909206
                        
Ticker Symbol

VASIX



<PAGE>
 
4

Fund Profile--Vanguard LifeStrategy Conservative Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy
LifeIncative Growth Fund.
    
INVESTMENT OBJECTIVE

The Fund seeks to provide current income and low to moderate growth of capital.
     
INVESTMENT STRATEGIES

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 60% of assets to bonds and 40%
to common stocks. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows:

 .    Vanguard Total Bond Market Index Fund           30%
 .    Vanguard Asset Allocation Fund                  25%
 .    Vanguard Short-Term Corporate Fund              20%
 .    Vanguard Total Stock Market Index Fund          20%
 .    Vanguard Total International Stock Index Fund    5%
    
Primary Risks

The Fund's total return, like bond and stock prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be moderate.

 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be moderate.

 .    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be low to moderate.

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing an underlying fund's
     return. Credit risk should be low.

 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its higher-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low.

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Conservative Growth Fund to
     underperform other funds with similar investment objectives.

Performance/Risk Information

The bar chart and table on the following page provide an indication of the risks
of investing in the Fund. The bar chart shows the Fund's performance in each
calendar year since inception. The table shows how the Fund's average annual
returns for one calendar year and since inception compare with those of broad-
based stock and bond market indexes and a composite stock/bond index weighted to
match the Fund's target allocation. Keep in mind that the Fund's past
performance does not indicate how it will perform in the future.
     

<PAGE>
 
    
                                                                               5

    ----------------------------------------------------------------------
                             Annual Total Returns
    ----------------------------------------------------------------------
                             
    1995   24.35%
    1996   10.36%
    1997   16.81%
    1998   15.88%

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

    During the period shown in the bar chart, the highest return for a 
    calendar quarter was 8.84% (quarter ended December 31, 1998) and the 
    lowest return for a quarter was -2.44% (quarter ended September 30, 
    1998).
    ----------------------------------------------------------------------
        Average Annual Total Returns for Years Ended December 31, 1998
    ----------------------------------------------------------------------
                                              1 Year     Since Inception*
    ----------------------------------------------------------------------
     Vanguard LifeStrategy Conservative 
      Growth Fund                             15.88%          15.70%
     Lehman Aggregate Bond Index               8.69            9.46
     Wilshire 5000 Index                      23.39           25.87
     Conservative Growth Composite Index**    14.19           14.37
    ----------------------------------------------------------------------
     *September 30, 1994.
     
     **Derived by applying the Fund's target allocation to the results of 
       the following benchmarks: for U.S. stocks, the Wilshire 5000 Equity 
       Index; for international stocks, the Total International Composite 
       Index; for bonds, the Lehman Brothers Aggregate Bond Index; and for 
       cash reserves, the Salomon Smith Barney 3-Month U.S. Treasury Bill 
       Index.
    ----------------------------------------------------------------------

Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

    Shareholder Fees (fees paid directly from your investment)
    Sales Charge (Load) Imposed on Purchases:                             None
    Sales Charge (Load) Imposed on Reinvested Dividends:                  None
    Redemption Fees:                                                      None
    Exchange Fees:                                                        None
    
    Annual Fund Operating Expenses (expenses deducted from the underlying
    funds' assets)

    Indirect Operating Expenses:                                             *

    *Although the Fund incurs no net expenses directly, the Fund's shareholders
     indirectly bear the expenses of the underlying Vanguard funds in which the
     Fund invests. See The Funds and Vanguard. The Fund's indirect expense
     ratio, based on its investments in the underlying Vanguard funds, was 0.29%
     as of December 31, 1998.
     

<PAGE>
 
6

Fund Profile--Vanguard LifeStrategy Conservative Growth Fund (continued)

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period. 
    
        --------------------------------------------------------------
               1 Year      3 Years       5 Years       10  Years
        --------------------------------------------------------------
                $30          $93          $163           $368
        --------------------------------------------------------------
     
     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information
    
Dividends and Capital Gains 

Dividends are distributed quarterly in March, June, September, and December;
capital gains, if any, are distributed annually in December
     
Investment Adviser

The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date

September 30, 1994
    
Net Assets as of December 31, 1998

$1.4 billion
     
Suitable for IRAs

Yes

Minimum Initial Investment

$3,000; $1,000 for IRAs and custodial accounts for minors

Newspaper Abbreviation

LifeCon

Vanguard Fund Number

724

Cusip Number

921909305

Ticker Symbol

VSCGX        




<PAGE>
 
                                                                               7

Fund Profile--Vanguard LifeStrategy Moderate Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy Moderate
Growth Fund.

Investment Objective

The Fund seeks to provide growth of capital and a low to moderate level of
current income.

Investment Strategies
    
The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 60% of assets to common stocks
and 40% to bonds. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows:     

 .    Vanguard Total Stock Market Index Fund            35%

 .    Vanguard Total Bond Market Index Fund             30%

 .    Vanguard Asset Allocation Fund                    25%

 .    Vanguard Total International Stock Index Fund     10%

Primary Risks

The Fund's total return, like stock and bond prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be moderate to
     high.

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be moderate.

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Moderate Growth Fund to
     underperform other funds with similar investment objectives.

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing the Fund's return.
     Credit risk should be low.

 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its higher-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low. 

 .    Currency risk, which is the chance that returns of Vanguard Total
     International Stock Index Fund will be hurt by a rise in the value of the
     U.S. dollar versus foreign currencies. Because only a small portion of the
     Fund's assets will be invested in Vanguard Total International Stock Index
     Fund, currency risk should be low.

 .    Country risk, which is the chance that unfavorable developments in a
     particular country--for example, political troubles, financial problems, or
     natural disasters--will harm Vanguard Total International Stock Index
     Fund's performance and therefore, the performance of the LifeStrategy
     Moderate Growth Fund. Because only a small portion of the Fund's assets
     will be invested in Vanguard Total International Stock Index Fund, country
     risk should be low.     


Performance/Risk Information
    
The bar chart and table on the following page provide an indication of the risks
of investing in the Fund. The bar chart shows the Fund's performance in each
calendar year since inception. The table shows how the Fund's average annual
returns for one calendar year and since inception compare with those of broad-
based stock and bond market indexes and a composite stock/bond index weighted to
match the Fund's target allocation. Keep in mind that the Fund's past
performance does not indicate how it will perform in the future.     


           

<PAGE>
 
8

Fund Profile--Vanguard LifeStrategy Moderate Growth Fund (continued)
    
        --------------------------------------------------------------
                             Annual Total Returns
        --------------------------------------------------------------
          1995        27.94%
          1996        12.71%
          1997        19.77%
          1998        19.03%
        --------------------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 13.08% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.52% (quarter ended September 30, 1998).

        --------------------------------------------------------------
        Average Annual Total Returns for Years Ended December 31, 1998
        --------------------------------------------------------------
                                            1 Year    Since Inception*
        --------------------------------------------------------------
         Vanguard LifeStrategy Moderate 
          Growth Fund                         19.03%        18.27%      
         Lehman Aggregate Bond Index           8.69          9.46
         Wilshire 5000 Index                  23.39         25.87    
         Moderate Growth Composite Index**    17.83         17.69
         --------------------------------------------------------------
          *September 30, 1994.
     
          **Derived by applying the Fund's target allocation to the
            results of the following benchmarks: for U.S. stocks, the 
            Wilshire 5000 Equity Index; for international stocks, the 
            Total International Composite Index; for bonds, the Lehman 
            Brothers Aggregate Bond Index; and for cash reserves, the 
            Salomon Smith Barney 3-Month U.S. Treasury Bill Index.
          --------------------------------------------------------------
Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

          Shareholder Fees (fees paid directly from your investment)
          Sales Charge (Load) Imposed on Purchases:                         None
          Sales Charge (Load) Imposed on Reinvested Dividends:              None
          Redemption Fees:                                                  None
          Exchange Fees:                                                    None
    
          Annual Fund Operating Expenses (expenses deducted from the 
          underlying funds' assets)

          Indirect Operating Expenses:                                         *

          *Although the Fund incurs no net expenses directly, the Fund's
           shareholders indirectly bear the expenses of the underlying Vanguard
           funds in which the Fund invests. See The Funds and Vanguard. The
           Fund's indirect expense ratio, based on its investments in the
           underlying Vanguard funds, was 0.29% as of December 31, 1998.      


<PAGE>
 
     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period. 
    
        --------------------------------------------------------------
               1 Year      3 Years       5 Years       10  Years
        --------------------------------------------------------------
                $30          $93          $163           $368
        --------------------------------------------------------------
     
     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information
    
Dividends and Capital Gains
Dividends are distributed semiannually in June and December; capital gains, if
any, are distributed annually in December
     
Investment Adviser

The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date

September 30, 1994
    
Net Assets as of December 31, 1998

$2.2 billion
     
Suitable for IRAs

Yes

Minimum Initial Investment

$3,000; $1,000 for IRAs and custodial accounts for minors
                               
Newspaper Abbreviation

LifeMod

Vanguard Fund Number

914

Cusip Number

921909404
                               
Ticker Symbol

VSMGX

                     9
<PAGE>
 
10

Fund Profile--Vanguard LifeStrategy Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy Growth
Fund.

Investment Objective

The Fund seeks to provide growth of capital and some current income.

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 80% of assets to common stocks
and 20% to bonds. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows:

 .    Vanguard Total Stock Market Index Fund                 50%
 .    Vanguard Asset Allocation Fund                         25%
 .    Vanguard Total International Stock Index Fund          15%
 .    Vanguard Total Bond Market Index Fund                  10%

Primary Risks

The Fund's total return, like stock and bond prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be high.

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Growth Fund to underperform other
     funds with similar investment objectives.

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be low.

 .    Currency risk, which is the chance that returns of Vanguard Total
     International Stock Index Fund will be hurt by a rise in the value of 
     the U.S. dollar versus foreign currency. Because only a small portion of
     the Fund's assets will be invested in the Total International Stock Index
     Fund, currency risk should be low.

 .    Country risk, which is the chance that unfavorable developments in a
     particular country--for example, political troubles, financial problems, or
     natural disasters--will harm Vanguard Total International Stock Index
     Fund's performance and therefore the performance of the LifeStrategy Growth
     Fund. Because only a small portion of the Fund's assets will be invested in
     Vanguard Total International Stock Index Fund, country risk should be low.
    
    
Performance/Risk Information
The bar chart and table on the following page provide an indication of the risks
of investing in the Fund. The bar chart shows the Fund's performance in each
calendar year since inception. The table shows how the Fund's average annual
returns for one calendar year and since inception compare with those of a broad-
based stock market index and a composite stock/bond index weighted to match the
Fund's target allocation. Keep in mind that the Fund's past performance does not
indicate how it will perform in the future.
     

<PAGE>
 
                                                                              11
    
     ---------------------------------------------------------------------
                              Annual Total Returns
     ---------------------------------------------------------------------
       1995      29.24%
       1996      15.41%
       1997      22.26%
       1998      21.40%
     ---------------------------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 17.31% (quarter ended December 31, 1998) and the lowest return for a
quarter was -8.84% (quarter ended September 30, 1998).

     ---------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
     ---------------------------------------------------------------------
                                              1 Year    Since Inception*
     ---------------------------------------------------------------------
     Vanguard LifeStrategy Growth Fund         21.40%       20.52%
     Wilshire 5000 Index                       23.39        25.87
     Growth Composite Index**                  20.48        20.09
     ---------------------------------------------------------------------
     
      *September 30, 1994.
     **Derived by applying the Fund's target allocation to the results of 
       the following benchmarks: for U.S. stocks, the Wilshire 5000 Equity 
       Index; for international stocks, the Total International Composite 
       Index; for bonds, the Lehman Brothers Aggregate Bond Index; and for 
       cash reserves, the Salomon Smith Barney 3-Month U.S. Treasury Bill 
       Index.
     ---------------------------------------------------------------------

FEES AND EXPENSES
The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

     Shareholder Fees (fees paid directly from your investment)
     Sales Charge (Load) Imposed on Purchases:                             None
     Sales Charge (Load) Imposed on Reinvested Dividends:                  None
     Redemption Fees:                                                      None
     Exchange Fees:                                                        None
    
     Annual Fund Operating Expenses (expenses deducted from the 
     underlying funds' assets)
     Indirect Operating Expenses:                                             *

     *Although the Fund incurs no net expenses directly, the Fund's shareholders
      indirectly bear the expenses of the underlying Vanguard funds in which the
      Fund invests. See The Funds and Vanguard. The Fund's indirect expense
      ratio, based on its investments in the underlying Vanguard funds, was
      0.29% as of December 31, 1998.
     
     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period. 
<PAGE>
 
12

Fund Profile--Vanguard LifeStrategy Growth Fund (continued)

         --------------------------------------------------------------
               1 Year      3 Years       5 Years       10 Years
         --------------------------------------------------------------
    
                $30          $93          $163           $368      
         --------------------------------------------------------------

     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown. 
    
Additional Information 
 
Dividends and Capital Gains 
Dividends are distributed semiannually in June and December; capital gains, if
any, are distributed annually in December      

Investment Adviser
The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date
September 30, 1994
    
Net Assets as of December 31, 1998
$1.9 billion
     
Suitable for IRAs
Yes

Minimum Initial Investment
$3,000; $1,000 for IRAs and custodial accounts for minors     
                                  
Newspaper Abbreviation            
LifeGro

Vanguard Fund Number
122                               
                                  
Cusip Number                      
921909503                         
                                  
Ticker Symbol                     
VASGX                             
<PAGE>
 
                                                                              13

More on the Funds

The following sections discuss other important features of the Vanguard
LifeStrategy Funds. You will find information about the risks of investing in
each Fund throughout these sections.

Asset Allocation Framework

Asset allocation--that is, dividing your investment among stocks, bonds, and
cash reserves--is one of the most critical decisions an investor makes.
Selecting the appropriate mix should be based on personal investment objectives,
time horizons, and risk tolerances. The LifeStrategy Funds offer varying degrees
of risk and reward by holding different combinations of assets, thereby
providing shareholders with a simple way to meet investment needs at different
stages of life.
    
     Each Fund invests in up to five underlying Vanguard funds to pursue a
target allocation of stocks, bonds, and cash instruments*. Because one of the
underlying funds (Vanguard Asset Allocation Fund) periodically shifts its
holdings among asset classes, each LifeStrategy Fund's asset mix can fluctuate
within a prescribed range. The tables below illustrate the expected asset
allocation and the potential allocation ranges for each Fund:
     
     --------------------------------------------------------------------
                            Expected Asset Allocation
     --------------------------------------------------------------------
                                               Stocks     Bonds     Cash*
     --------------------------------------------------------------------
     LifeStrategy Income Fund                   20%        80%        0%
     LifeStrategy Conservative Growth Fund      40%        60%        0%
     LifeStrategy Moderate Growth Fund          60%        40%        0% 
     LifeStrategy Growth Fund                   80%        20%        0%
     --------------------------------------------------------------------

     --------------------------------------------------------------------
                    Potential Asset Allocation Range
     --------------------------------------------------------------------
                                               Stocks     Bonds     Cash*
     --------------------------------------------------------------------
     LifeStrategy Income Fund                  5%-30%    70%-95%   0%-25%
     LifeStrategy Conservative Growth Fund    25%-50%    50%-75%   0%-25%
     LifeStrategy Moderate Growth Fund        45%-70%    30%-55%   0%-25% 
     LifeStrategy Growth Fund                 65%-90%    10%-35%   0%-25% 
     --------------------------------------------------------------------

*"Cash" consists of any cash instruments held by Vanguard Asset Allocation Fund,
 one of the underlying Vanguard funds in which the LifeStrategy Funds invest.


                                PLAIN TALK ABOUT

                                 Balanced Funds

     Balanced funds are generally "middle-of-the-road" investments that seek to
     provide some combination of growth, income, and conservation of capital by
     investing in a mix of stocks, bonds, and/or money market instruments.
     Because the prices of stocks and bonds often move in different directions,
     balanced funds are able to use rewards from one type of investment to help
     offset the risks from another.
<PAGE>
 
14
    
Primary Investment Strategies
This section explains how the Funds pursue their individual objectives by
investing in different combinations of Vanguard funds that hold stocks, bonds,
and cash instruments. In addition, this section discusses several important
risks faced by investors in some or all of the Funds. The Funds' Board of
Trustees oversees the management of the Funds, and may change the investment
strategies in the interest of shareholders. 

Market Exposure 

Stocks
By owning shares of other Vanguard mutual funds, each of the LifeStrategy Funds
indirectly invests, to varying degrees, in U.S. common stocks, with emphasis on
large-cap stocks, and to a lesser extent in foreign stocks (except that
LifeStrategy Income Fund will not invest in foreign stocks).
           

[GRAPHIC  The Funds are subject to stock market risk, which is the possibility
APPEARS   that stock prices overall will decline over short or even long
HERE]     periods. Stock markets tend to move in cycles, with periods of rising
          prices and periods of falling prices.

To illustrate the volatility of stock prices, the following table shows the
best, worst, and average total returns for the U.S. stock market over various
periods as measured by the Standard & Poor's 500 Composite Stock Price Index, a
widely used barometer of stock market activity. (Total returns consist of
dividend income plus change in market price.) Note that the returns shown do not
include the costs of buying and selling stocks or other expenses that a
real-world investment portfolio would incur. Note, also, that the gap between
best and worst tends to narrow over the long term.
    
     ---------------------------------------------------------------------
                      U.S. Stock Market Returns (1926-1998)
     ---------------------------------------------------------------------
                             1 Year      5 Years     10 Years    20 Years
     ---------------------------------------------------------------------

     Best                     54.2%       24.1%        19.9%       17.7%
     Worst                   -43.1       -12.4         -0.8         3.1
     Average                  13.1        10.7         11.0        11.0
     ---------------------------------------------------------------------
     
     The table covers all of the 1-, 5-, 10-, and 20-year periods from 1926
through 1998. You can see, for example, that while the average return on stocks
for all of the 5-year periods was 10.7%, returns for individual 5-year periods
ranged from a -12.4% average (from 1928 through 1932) to 24.1% (from 1994
through 1998). These average returns reflect past performance on common stocks;
you should not regard them as an indication of future returns from either the
stock market as a whole or these Funds in particular.
    
     Through their investments in one underlying fund (the Asset Allocation
Fund), the Funds will hold a diversified combination of common stocks intended
to parallel the performance of the S&P 500 Index, which is dominated by
large-cap U.S. common stocks. Through another underlying fund (the Total Stock
Market Index Fund), each Fund will hold a representative sample of the
securities in the Wilshire 5000 Equity Index--a benchmark for the entire U.S.
stock market.

     Keep in mind that a significant portion of the market value of the Wilshire
5000 Index (about 22% as of December 31, 1998) is comprised of securities not
included in the S&P 500 Index. These securities are overwhelmingly mid- and
small-cap stocks, which historically have been more volatile than--and at times
have performed quite differently from--the stocks of larger companies. 
     
                                PLAIN TALK ABOUT

                               Large-Cap, Mid-Cap,
                              and Small-Cap Stocks

Stocks of publicly traded companies--and mutual funds that hold these 
stocks--can be classified by the companies' market value, or capitalization.
Generally, Vanguard defines large-capitalization (large-cap) funds as those
holding stocks of companies whose outstanding shares have a market value
exceeding $10 billion. Mid-cap funds hold stocks of companies with a market
value between $1 billion and $10 billion. Small-cap funds typically hold stocks
of companies with a market value of $1 billion or less.
<PAGE>
 
                                                                              15
    
     By owning shares of Vanguard Total International Stock Index Fund, which
invests in foreign stocks, the LifeStrategy Conservative Growth, Moderate
Growth, and Growth Funds are subject to country risk and currency risk. Country
risk is the chance that political troubles (such as a war), financial problems
(such as government default), or natural disasters (such as an earthquake) will
weaken a country's economy and cause investments in that country to lose money.
Currency risk is the chance that a stronger U.S. dollar will reduce returns for
Americans investing overseas. Generally, when the dollar rises in value against
a foreign currency, your investment in that country loses value because its
currency is worth fewer U.S. dollars. 

Bonds

By owning shares of other Vanguard mutual funds, each of the LifeStrategy Funds
indirectly invests, to varying degrees, in government, agency, and corporate
bonds.
     
[GRAPHIC  The Funds are subject to interest rate risk, which is the possibility
APPEARS   that bond prices overall will decline over short or even long periods
HERE]     due to rising interest rates. Interest rate risk is modest for 
          shorter-term bonds and higher for longer-term bonds.

     Although bonds are often thought to be less risky than stocks, there have
been periods when bond prices have fallen significantly due to rising interest
rates. For instance, prices of long-term bonds fell by almost 48% between
December 1976 and September 1981. 

     To illustrate the relationship between bond prices and interest rates, the
following table shows the impact of a 2% change (both up and down) in interest
rates on three bonds of different maturities, each with a face value of $1,000.

<TABLE>
<CAPTION>
     --------------------------------------------------------------------------------
                  How Interest Rate Changes Affect Bond Prices*
     --------------------------------------------------------------------------------
                                     Value of a $1,000 Bond   Value of a $1,000 Bond 
     Type of Bond                     After a 2% Increase     After a 2% Decrease
     (Maturity)                        in Interest Rates         in Interest Rates
     --------------------------------------------------------------------------------
     <S>                             <C>                     <C>        
     Short-Term (2.5 years)                 $956                     $1,046
     Intermediate-Term (10 years)            870                      1,156
     Long-Term (20 years)                    816                      1,251
     ---------------------------------------------------------------------------------
     *Assuming a 7% yield.
     ---------------------------------------------------------------------------------
</TABLE>

     These figures are intended only to illustrate interest rate risk; they
should not be regarded as an indication of future returns from the bond market
as a whole, or any Fund in particular.
    
     Changes in interest rates will affect bond income as well as bond prices.
 
[GRAPHIC  The Funds are subject to income risk, which is the possibility that a
APPEARS   Fund's dividends (income) will decline due to falling interest rates.
HERE]     Income risk is generally higher for short-term bonds, and lower for
          long-term bonds.
     
                                PLAIN TALK ABOUT

                            Bonds and Interest Rates

As a rule, when interest rates rise, bond prices fall. The opposite is also
true: Bond prices go up when interest rates fall. Why do bond prices and
interest rates move in opposite directions? Let's assume that you hold a bond
offering a 5% yield. A year later, interest rates are on the rise and bonds are
offered with a 6% yield. With higher-yielding bonds available, you would have
trouble selling your 5% bond for the price you paid--causing you to lower your
asking price. On the other hand, if interest rates were falling and 4% bonds
were being offered, you should be able to sell your 5% bond for more than you
paid.

                                PLAIN TALK ABOUT

                                 Bond Maturities

A bond is issued with a specific maturity date--the date when the bond's issuer,
or seller, must pay back the bond's initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30
years (long-term). The longer a bond's maturity, the more risk you, as a bond
investor, face as interest rates rise--but also the more interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hope of higher yields; short-term bond investors should be willing to
accept lower yields in return for less fluctuation in the value of their
investment.
<PAGE>
 
16
    
     Income risk is a concern primarily for the LifeStrategy Income and
Conservative Growth Funds, which, through their ownership of Vanguard Short-Term
Corporate Fund, indirectly own more short-term bonds.

[GRAPHIC  The Funds are subject to prepayment risk, which is the possibility
APPEARS   that during periods of falling interest rates, a bond issuer will
HERE]     repay its higher-yielding bond earlier than scheduled. Forced to
          reinvest the unanticipated proceeds at lower rates, the underlying
          fund would experience a decline in income.

     The risk of prepayment applies primarily to intermediate- and long-term
corporate bonds and mortgage-backed bonds, which comprise a significant portion
of Vanguard Total Bond Market Index Fund. Prepayment risk is a concern primarily
for the LifeStrategy Income Fund, which will invest half its assets in the Total
Bond Market Index Fund.
 
[GRAPHIC  The Funds are subject to credit risk, which is the possibility that a
APPEARS   bond issuer will fail to pay interest and principal in a timely
HERE]     manner.
     
     The credit quality of the bonds held by the underlying funds is expected to
be very high, and thus credit risk of the LifeStrategy Funds should be low.

     To a limited extent, the Funds are also indirectly exposed to event risk,
which is the possibility that corporate fixed-income securities held by
underlying funds may suffer a substantial decline in credit quality and market
value due to a corporate restructuring.

Cash
Through one underlying fund (Vanguard Asset Allocation Fund), from 0% to 25% of
the assets of each LifeStrategy Fund can be invested in cash instruments. These
potential cash holdings make the Funds subject to inflation risk, which is the
possibility that the rising cost of living may erode the purchasing power of
your investment over time.
    
     Since the Asset Allocation Fund typically invests only a small portion of
its assets in cash instruments, and the LifeStrategy Funds invest only
one-fourth of their assets in the Asset Allocation Fund, inflation risk to the
Funds is very low. 
     
Security Selection 

Underlying Funds
Each Fund seeks to achieve its objective by investing in fixed percentages of
four or five underlying Vanguard funds. The following table shows these
percentages for each Fund.

     ---------------------------------------------------------------------------
                                LifeStrategy Fund
     ---------------------------------------------------------------------------
                                                Conservative  Moderate
     Underlying Vanguard Fund           Income     Growth      Growth     Growth
     ---------------------------------------------------------------------------
     Total Stock Market Index             5%         20%         35%        50%
     Total International Stock Index      --          5          10         15
     Total Bond Market Index              50         30          30         10
     Short-Term Corporate                 20         20          --         --
     Asset Allocation                     25         25          25         25
     ---------------------------------------------------------------------------
     Total                               100%       100%        100%       100%
     ---------------------------------------------------------------------------
    
     The allocation of each Fund's assets among the underlying funds is made by
the LifeStrategy Funds' Board of Trustees based on the Fund's investment
objective and policies, and may be changed from time to time without shareholder
approval. The Funds' investments in the underlying funds may be limited at times
by certain factors. For example, the Board of Trustees of an underlying fund may
impose limits on additional investments in the fund.      


<PAGE>
 
                                                                              17

The following briefly describes the five underlying Vanguard funds in which the
Funds invest.
    
 .    Vanguard Total Stock Market Index Fund seeks to provide investment results
     that parallel the performance of the unmanaged Wilshire 5000 Index, which
     consists of all U.S. common stocks traded on the New York and American
     Stock Exchanges and the NASDAQ over-the-counter market.

 .    Vanguard Total International Stock Index Fund seeks to provide investment
     results that parallel the performance of the Morgan Stanley Capital
     International (MSCI) Europe, Australasia, Far East Index plus the MSCI
     Select Emerging Markets Free Index. The fund has exposure to stocks in more
     than 35 foreign countries. Note: Purchases of the Total International Stock
     Index Fund by the LifeStrategy Funds (other than purchases with reinvested
     dividends or capital gains) are subject to a transaction fee of 0.50%. This
     fee is not a sales load; it is retained by the Total International Stock
     Index Fund to offset the high costs of trading international securities.
     The transaction fee ensures that these higher costs are borne by the
     investors making the transactions--and not by the shareholders already in
     the fund.
     
 .    Vanguard Total Bond Market Index Fund seeks to provide investment results
     that parallel the performance of the Lehman Brothers Aggregate Bond Index.
     The fund is designed to provide investors with a low-cost method of
     consistently capturing the return of the U.S. bond market, as defined by
     its benchmark index.

 .    Vanguard Short-Term Corporate Fund invests in a diversified portfolio of
     investment-grade corporate bonds with an expected average maturity of two
     to three years.

 .    Vanguard Asset Allocation Fund invests in a mix of common stocks (selected
     to parallel the performance of the S&P 500 Index), long-term U.S. Treasury
     bonds, and cash equivalents. The allocations are designed to take advantage
     of perceived imbalances in the relative returns and risks of each asset
     class. At any given time, the adviser may allocate all, a portion, or none
     of the fund's assets to stocks, bonds, or cash reserves.

[GRAPHIC  Through their investments in Vanguard Asset Allocation Fund, the
APPEARS   LifeStrategy Funds are subject to manager risk, which is the
HERE]     possibility that the fund's adviser could do a poor job of deciding on
          allocations to each asset class.
    
Temporary Defensive Measures 
The Funds' underlying funds may, from time to time, take temporary defensive
measures--such as holding cash reserves without limit--that are inconsistent
with the funds' primary investment strategies, in response to adverse market,
economic, political, or other conditions. If one or more of the underlying funds
take temporary defensive measures, the LifeStrategy Funds may not achieve their
investment objective.
     
Costs and Market-Timing
Some investors try to profit from market-timing--switching money into
investments when they expect prices to rise, and taking money out when they
expect the market to fall. As money is shifted in and out, a fund incurs
expenses for buying and selling securities. These costs are borne by all fund
shareholders, including the long-term investors who do not generate the costs.
Therefore, the Funds have adopted the following policies, among others, designed
to discourage short-term trading:
    
 .    Each Fund reserves the right to reject any purchase request--including
     exchanges from other Vanguard funds--that it regards as disruptive to the
     efficient management of the Fund or the underlying funds. A purchase
     request could be rejected because of the timing of the request or because
     of a history of excessive trading by the investor. 
     
                                PLAIN TALK ABOUT

                             The Costs of Investing

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with the buying and selling of securities by the fund. These
costs can erode a substantial portion of the gross income or capital
appreciation a fund achieves. Even seemingly small differences in expenses can,
over time, have a dramatic effect on a fund's performance.
<PAGE>
 
18

 .    There is a limit on the number of times you can exchange into and out of
     each Fund (see "Redeeming Shares" in the Investing with Vanguard section).

 .    Each Fund reserves the right to stop offering shares at any time.

     The Vanguard funds do not permit market-timing. Do not invest in these
Funds if you are a market-timer.


The Funds and Vanguard
    
The LifeStrategy Funds have entered into an Agreement with Vanguard under which
Vanguard provides all management, administrative, and distribution services to
the Funds at cost. The Funds owe Vanguard a sum sufficient to cover Vanguard's
out-of-pocket costs. The Funds also bear the expenses of services provided by
other parties (such as auditors, legal counsel, and the Fund's custodian), as
well as taxes and other direct expenses of the Fund. However, the Agreement
provides that the Funds' expenses will be offset by a reimbursement from
Vanguard for (a) contributions made by the Funds to the cost of operating the
underlying Vanguard funds in which the LifeStrategy Funds invest, and (b)
certain savings in administrative and marketing costs that Vanguard is expected
to derive from the operation of the Funds.

  The Funds' Trustees believe that the reimbursements should be sufficient to
offset most, if not all, of the expenses incurred by the Funds. Therefore, the
Funds are expected to operate at a very low or zero expense ratio. Since their
inception in 1994, the Funds in fact have had no direct net expenses.
     
  Of course, shareholders of the LifeStrategy Funds will still bear, indirectly,
their proportionate share of the costs of operating the underlying Vanguard
funds. During their most recent fiscal years, the underlying funds had the
following expense ratios:
    
 . Total Stock Market Index                        0.20%
 . Total International Stock Index                 0.34%
 . Total Bond Market Index                         0.20%
 . Short-Term Corporate                            0.27%
 . Asset Allocation                                0.49%
     
  Based on the percentage of each underlying fund owned, the LifeStrategy Funds
had the following indirect expense ratios as of December 31, 1998:
    
     ----------------------------------------------------------------
     Fund                                      Indirect Expense Ratio 
     ----------------------------------------------------------------
     LifeStrategy Income                               0.29%
     LifeStrategy Conservative Growth                  0.29%
     LifeStrategy Moderate Growth                      0.29%
     LifeStrategy Growth                               0.29% 
     ----------------------------------------------------------------
     
                                PLAIN TALK ABOUT

                      Vanguard's Unique Corporate Structure

The Vanguard Group is truly a mutual mutual fund company. It is owned jointly by
the funds it oversees and thus indirectly by the shareholders in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person, by a group of individuals, or by investors who own the
management company's stock. By contrast, Vanguard provides its services on an
"at-cost" basis, and the funds' expense ratios reflect only these costs. No
separate management company reaps profits or absorbs losses from operating the
funds.
<PAGE>
 
                                                                              19

Investment Adviser

The Life Strategy Funds do not employ an investment adviser, but they benefit
from the investment advisory services rendered to the underlying funds. The
underlying funds are managed by the following investment advisory firms:

<TABLE> 

     ----------------------------------------------------------------------------------------
     <S>                                                <C> 
     Underlying Fund                                    Investment Advisory Firm
     ----------------------------------------------------------------------------------------
     Vanguard Total Stock Market Index Fund             Vanguard Core Management Group
     ----------------------------------------------------------------------------------------
     Vanguard Total International Stock Index Fund      Vanguard Core Management Group*
     ----------------------------------------------------------------------------------------
     Vanguard Total Bond Market Index Fund              Vanguard Fixed Income Group
     ----------------------------------------------------------------------------------------
     Vanguard Short-Term Corporate Fund                 Vanguard Fixed Income Group
     ----------------------------------------------------------------------------------------
     Vanguard Asset Allocation Fund                     Mellon Capital Management Corporation
     ----------------------------------------------------------------------------------------
     * Vanguard Total International Stock Index Fund does not have its own
       investment adviser, but rather benefits from the advisory services
       provided by the Core Management Group to the three underlying funds in
       which the Total International Stock Index Fund invests: Vanguard
       European Stock Index Fund, Vanguard Pacific Stock Index Fund, and
       Vanguard Emerging Markets Stock Index Fund. The Core Management Group
       also manages the Total International Stock Index Fund's cash assets,
       if any.
     ----------------------------------------------------------------------------------
</TABLE> 

The chart below briefly describes each investment advisory firm:

<TABLE>
<CAPTION>
    
     ----------------------------------------------------------------------------------------
     Firm                                         Background
     ----------------------------------------------------------------------------------------
     <S>                                          <C>
     Mellon Capital Management Corporation        Based in San Francisco, California
                                                  Founded in 1983
                                                  Manages more than $73 billion in assets
     ----------------------------------------------------------------------------------------
     Vanguard Core Management Group               Based in Valley Forge, Pennsylvania
                                                  Founded in 1974
                                                  Manages more than $147 billion in assets
     ---------------------------------------------------------------------------------------
     Vanguard Fixed Income Group                  Based in Valley Forge, Pennsylvania
                                                  Founded in 1974
                                                  Manages more than $127 billion in assets
     ---------------------------------------------------------------------------------------
</TABLE>

     The Board of Trustees of an underlying fund may, without prior approval
from shareholders of the underlying fund or the LifeStrategy Funds, change the
terms of any advisory agreement or hire a new investment adviser, either as a
replacement for an adviser or as an additional adviser.
     
Year 2000 Challenge

     The common practice in computer programming of using just two digits to
identify a year has resulted in the Year 2000 challenge throughout the
information technology industry. If unchanged, many computer applications and
systems could misinterpret dates occurring after December 31, 1999, leading to
errors or failure. Such failure could adversely affect a fund's operations,
including pricing, securities trading, and the servicing of shareholder
accounts.

     The Vanguard Group is dedicated to providing uninterrupted, high-quality
performance from our computer systems before, during, and after 2000. In July
1998, we completed the renovation and initial testing of our internal systems.
Vanguard is diligently working with external partners, suppliers, and vendors,
including fund managers and other service providers, to assure that the systems
with which we interact remain operational at all times.
<PAGE>
 
20
                                                                            
     In addition to taking every reasonable step to secure our internal systems
and external relationships, Vanguard is further developing contingency plans
intended to assure that unexpected systems failures will not adversely affect
the Funds' operations. Vanguard intends to monitor these processes through the
rollover of 1999 into 2000 and to quickly implement alternate solutions if
necessary. 

     However, despite Vanguard's efforts and contingency plans, noncompliant
computer systems could have a material adverse effect on the Funds' business,
operations, or financial condition. Additionally, the Funds' performance could
be hurt if a computer-system failure at a company or governmental unit affects
the price of securities the Funds' underlying funds own.


Dividends, Capital Gains, and Taxes
    
Each of the LifeStrategy Funds distributes to shareholders virtually all of its
net income (interest and dividends paid by the underlying funds) as well as any
capital gains realized from the sale of its holdings or received as capital
gains distributions from the underlying funds. The Income and Conservative
Growth Funds distribute their net income in March, June, September, and
December, while the Moderate Growth and Growth Funds pay such distributions each
June and December. Capital gains distributions generally occur in December. In
addition, the Funds may occasionally be required to make supplemental dividend
or capital gains distributions at some other time during the year.
     
     You can receive distributions of income or capital gains in cash, or you
can have them automatically invested in more shares of each Fund. In either
case, these distributions are taxable to you. It is important to note that
distributions of dividends and capital gains that are declared in December--if
paid to you by the end of January--are taxed as if they had been paid to you in
December. 

     Vanguard will send you a statement each year showing the tax status of all
your distributions. If you have chosen to receive dividend and/or capital gains
distributions in cash, and the postal or other delivery service is unable to
deliver checks to your address of record, we will change the distribution option
so that all dividends and other distributions are automatically invested in
additional shares. We will not pay interest on uncashed distribution checks.

 .    The dividends and short-term capital gains that you receive are considered
     ordinary income for tax purposes. 

 .    Any distributions of net long-term capital gains by the Funds are taxable
     to you as long-term capital gains, no matter how long you've owned shares
     in such Fund.
    
 .    Although the Funds do not seek to realize any particular amount of capital
     gains during a year, such gains are realized from time to time as
     by-products of their ordinary investment activities and the investment
     activities of the underlying funds. Consequently, distributions may vary
     considerably from year to year.
     
 .    If you sell or exchange shares, any gain or loss you have is a taxable
     event. This means that you may have a capital gain to report as income, or
     a capital loss to report as a deduction, when you complete your federal
     income tax return. 

 .    Distributions of dividends or capital gains, and capital gains or losses
     from your sale or exchange of Fund shares, may be subject to state and
     local income taxes as well.

     The tax information in this prospectus is provided as general information
and will not apply to you if you are investing through a tax-deferred account
such as an IRA or a qualified employee benefit plan. (Non-U.S. 
    
                               PLAIN TALK ABOUT

                              "Buying a Dividend"

Unless you are investing through a tax-deferred retirement account (such as an
IRA), it is not to your advantage to buy shares of a fund shortly before it
makes a distribution, because doing so can cost you money in taxes. This is
known as "buying a dividend." For example: on December 15, you invest $5,000,
buying 250 shares for $20 each. If the fund pays a distribution of $1 per share
on December 16, its share price would drop to $19 (not counting market change).
You still have only $5,000 (250 shares x $19 = $4,750 in share value, plus 250
shares x $1 = $250 in distributions), but you will owe tax on the $250
distribution you receive--even if you reinvest it in more shares. To avoid
"buying a dividend," check a fund's distribution schedule before you invest.
     
<PAGE>
 
                                                                              21

investors may be subject to U.S. withholding and estate tax.) You should consult
your tax adviser about the tax consequences of an investment in the Funds.

     Important Note: By law, each Fund must withhold 31% of your taxable
distributions and any redemption proceeds if you do not provide your correct
taxpayer identification number, or certify that it is correct, or if the IRS
instructs the Funds to do so.


Share Price
    
Each Fund's share price, called its net asset value, or NAV, is calculated each
business day after the close of trading on the New York Stock Exchange (the NAV
is not calculated on holidays or other days the Exchange is closed). Net asset
value per share is computed by adding up the total value of the Fund's
investments (i.e., shares of the underlying Vanguard funds) and other assets,
subtracting any of its liabilities (debts), and then dividing by the number of
Fund shares outstanding:
     
                               Total Assets - Liabilities
          Net Asset Value = ---------------------------------
                              Number of Shares Outstanding

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the number of shares you own, gives you the dollar amount you would have
received had you sold all of your shares back to the Fund that day.
         
     The Funds' share prices can be found daily in the mutual fund listings of
most major newspapers under the heading "Vanguard Funds." Different newspapers
use different abbreviations of the Funds' names, but the most common are:
LifeInc, LifeCon, LifeMod, and LifeGro.
<PAGE>
 
22

                                PLAIN TALK ABOUT

                  How to Read the Financial Highlights Tables
    
This explanation uses the LifeStrategy Income Fund as an example. The Fund began
fiscal 1998 with a net asset value (price) of $12.43 per share. During the
year,earned $.63 per share from investment income, $.20 per share in capital
gains distribution and $.78 per share from investments that had appreciated in
value or that were sold for higher prices than the Fund paid for them.

Shareholders received $.82 per share in the form of dividend and capital gains
distributions. A portion of each year's distributions may come from the prior
year's income or capital gains.
                                          
The earnings ($1.61 per share) minus the distributions ($.82 per share) resulted
in a share price of $13.22 at the end of the year. This was an increase of $.79
per share (from $12.43 at the beginning of the year to $13.22 at the end of the
year). For a shareholder who reinvested the distributions in the purchase of
more shares, the total return from the Fund was 13.17% for the year.

As of December 31, 1998, the Fund had $449 million in net assets. For the year,
its net investment income amounted to 5.24% of its average net assets; and it
sold and replaced securities valued at 3% of its net assets.
     
Financial Highlights

The following financial highlights tables are intended to help you understand
each Fund's financial performance since inception, and certain information
reflects financial results for a single Fund share. The total returns in the
table represent the rate that an investor would have earned or lost each period
on an investment in each Fund (assuming reinvestment of gains distributions.)
This information has been derived from the financial statements audited by
PricewaterhouseCoopers LLP, independent accountants, whose report--along with
the Funds' financial statements--is included in the Funds' most recent annual
report toshareholders. You may have the annual report sent to you without charge
by contacting Vanguard.

<TABLE>     
<CAPTION>
- ---------------------------------------------------------------------------------------------------
                                                       Vanguard LifeStrategy Income Fund
                                                         Year Ended December 31,       
                                                  -----------------------------------   Sep. 30* to
                                                   1998      1997      1996      1995 Dec. 31, 1994
- ---------------------------------------------------------------------------------------------------
<S>                                               <C>       <C>       <C>       <C>       <C>
Net Asset Value, Beginning of Period              $12.43    $11.55    $11.54    $9.88     $10.00
- ---------------------------------------------------------------------------------------------------
Investment Operations
  Net Investment Income                              .63       .63       .64      .49        .14
  Capital Gains Distributions Received               .20       .15       .19      .09         --
  Net Realized and Unrealized              
    Gain (Loss) on Investments                       .78       .83       .03     1.66       (.12)
                                                  -------------------------------------------------
    Total from Investment Operations                1.61      1.61       .86     2.24        .02
                                                  -------------------------------------------------
Distributions
  Dividends from Net          
    Investment Income                               (.63)     (.63)     (.64)    (.49)      (.14)
  Distributions from Realized 
    Capital Gains                                   (.19)     (.10)     (.21)    (.09)        --
                                                  -------------------------------------------------
    Total Distributions                             (.82)     (.73)     (.85)    (.58)      (.14)
- ---------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                    $13.22    $12.43    $11.55   $11.54     $ 9.88
===================================================================================================

Total Return                                       13.17%    14.23%     7.65%   22.99%      0.20%
===================================================================================================

Ratios/Supplemental Data
  Net Assets, End of Period (Millions)              $449      $244      $151     $121        $11
  Ratio of Expenses to 
    Average Net Assets                                 0%       0%         0%       0%         0%  
  Ratio of Net Investment Income to       
    Average Net Assets                              5.24%     5.54%     5.66%    5.76%      7.31%**
  Turnover Rate                                        3%        6%       22%       4%         1%
===================================================================================================
</TABLE>
 *Inception date.
**Annualized.
     
     From time to time, the Vanguard funds advertise yield and total return
figures. Yield is a measure of past dividend income. Total return includes both
past dividend income (assuming that it has been reinvested) plus realized and
unrealized capital appreciation (or depreciation). Neither yield nor total
return should be used to predict the future performance of a fund.
<PAGE>
 
                                                                              23
    
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                                   Vanguard LifeStrategy Conservative Growth Fund
                                                         Year Ended December 31,        
                                                  -----------------------------------    Sep. 30* to
                                                    1998      1997      1996     1995  Dec. 31, 1994
- ----------------------------------------------------------------------------------------------------
<S>                                               <C>       <C>       <C>      <C>        <C> 
Net Asset Value, Beginning of Period              $13.40    $12.14    $11.68    $9.89     $10.03
- ----------------------------------------------------------------------------------------------------
Investment Operations
 Net Investment Income                               .58       .56       .53      .47        .14 
 Capital Gains Distributions Received                .20       .18       .20      .11        .01
 Net Realized and Unrealized Gain (Loss) on 
  Investments                                       1.32      1.27       .46     1.80       (.14)
                                                 ---------------------------------------------------
   Total from Investment Operations                 2.10      2.01      1.19     2.38        .01
                                                 ---------------------------------------------------
Distributions
 Dividends from Net Investment Income               (.59)     (.56)     (.53)    (.47)      (.14)
 Distributions from Realized Capital Gains          (.20)     (.19)     (.20)    (.12)      (.01)
                                                 ---------------------------------------------------
   Total Distributions                              (.79)     (.75)     (.73)    (.59)      (.15)
- ----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                    $14.71    $13.40    $12.14   $11.68     $ 9.89
====================================================================================================

Total Return                                       15.88%    16.81%    10.36%   24.35%      0.10%
====================================================================================================

Ratios/Supplemental Data
 Net Assets, End of Period (Millions)             $1,416      $803      $462     $219        $41
 Ratio of Expenses to Average Net Assets               0%        0%        0%       0%         0%
 Ratio of Net Investment Income to Average Net 
  Assets                                            4.32%     4.61%     4.86%    5.14%      7.07%**
 Turnover Rate                                         3%        1%        2%       1%         0%
===================================================================================================
</TABLE> 
 *Inception date.
**Annualized.

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                                   Vanguard LifeStrategy Moderate Growth Fund
                                                         Year Ended December 31,        
                                                  -----------------------------------    Sep. 30* to
                                                    1998      1997      1996     1995  Dec. 31, 1994
- ----------------------------------------------------------------------------------------------------
<S>                                               <C>       <C>       <C>       <C>        <C> 
Net Asset Value, Beginning of Period              $14.81    $12.97    $12.11   $ 9.86     $10.08
- ----------------------------------------------------------------------------------------------------
Investment Operations
 Net Investment Income                              .510      .490       .44      .36        .14
 Capital Gains Distributions Received               .241      .236       .22      .13        .01
 Net Realized and Unrealized Gain (Loss) 
  on Investments                                   2.054     1.819       .87     2.25       (.22)
                                                 ---------------------------------------------------
  Total from Investment Operations                 2.805     2.545      1.53     2.74       (.07)
                                                 ---------------------------------------------------
Distributions
 Dividends from Net Investment Income              (.510)    (.490)     (.44)    (.36)      (.14)
 Distributions from Realized Capital Gains         (.245)    (.215)     (.23)    (.13)      (.01)
                                                 ---------------------------------------------------
  Total Distributions                              (.755)    (.705)     (.67)    (.49)      (.15)
- ---------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                    $16.86    $14.81    $12.97   $12.11     $ 9.86
===================================================================================================

Total Return                                       19.03%    19.77%    12.71%   27.94%     -0.70%
===================================================================================================

Ratios/Supplemental Data
 Net Assets, End of Period (Millions)             $2,202    $1,358      $826     $235        $35
 Ratio of Expenses to Average Net Assets               0%        0%        0%       0%         0%
 Ratio of Net Investment Income to Average 
  Net Assets                                        3.43%     3.72%     3.98%    4.42%      7.10%**
 Turnover Rate                                         5%        2%        3%       1%         0%
===================================================================================================
</TABLE>

 *Inception date.
**Annualized.
     
<PAGE>
 
24
    
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
                                                   Vanguard LifeStrategy Growth Fund
                                                         Year Ended December 31,        
                                                  -----------------------------------   Sep. 30* to
                                                    1998      1997      1996     1995  Dec. 31, 1994
- ----------------------------------------------------------------------------------------------------
<S>                                               <C>       <C>       <C>      <C>        <C> 
Net Asset Value, Beginning of Period              $16.04    $13.68    $12.36   $ 9.93     $10.10
- ----------------------------------------------------------------------------------------------------
Investment Operations
 Net Investment Income                              .410       .39       .34      .32        .13
 Capital Gains Distributions Received               .264       .28       .24      .14        .02
 Net Realized and Unrealized Gain (Loss) 
  on Investments                                   2.751      2.36      1.32     2.43       (.16)
                                                  --------------------------------------------------
   Total from Investment Operations                3.425      3.03      1.90     2.89       (.01)
                                                  --------------------------------------------------
Distributions
 Dividends from Net Investment Income              (.410)     (.38)     (.35)    (.31)      (.14)
 Distributions from Realized Capital Gains         (.265)     (.29)     (.23)    (.15)      (.02)
                                                  --------------------------------------------------
   Total Distributions                             (.675)     (.67)     (.58)    (.46)      (.16)
- ----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                    $18.79    $16.04    $13.68   $12.36     $ 9.93
====================================================================================================

Total Return                                       21.40%    22.26%    15.41%   29.24%     -0.10%
====================================================================================================

Ratios/Supplemental Data
 Net Assets, End of Period (Millions)             $1,924    $1,184      $629     $217        $38
 Ratio of Expenses to Average Net Assets               0%        0%        0%       0%         0%
 Ratio of Net Investment Income to Average 
  Net Assets                                        2.53%     2.84%     3.18%    3.67%      7.06%**
 Turnover Rate                                         2%        1%        0%       1%         1%
====================================================================================================
</TABLE>
*Inception date.
**Annualized.

"Standard & Poor's(R),""S&P(R),""S&P 500(R),""Standard & Poor's 500," and "500"
are trademarks of The McGraw-Hill Companies, Inc.
     
<PAGE>
 
                                                                              25

Investing with Vanguard

Are you looking for the most convenient way to open or add money to a Vanguard
account? Obtain instant access to fund information? Establish an account for a
minor child or for your retirement savings?
     Vanguard can help. Our goal is to make it easy and pleasant for you to do
business with us.
     The following sections of the prospectus briefly explain the many services
we offer. Booklets providing detailed information are available on the services
marked with a [GRAPHIC APPEARS HERE]. Please call us to request copies.


Services and Account Features

Vanguard offers many services that make it convenient to buy, sell, or exchange
shares, or to obtain fund or account information.
- --------------------------------------------------------------------------------
Telephone Redemptions (Sales and Exchanges)
Automatically set up for these Funds unless you notify us otherwise.
- --------------------------------------------------------------------------------
Vanguard Direct Deposit Service(TM) [GRAPHIC APPEARS HERE]
Automatic method for depositing your paycheck or U.S. government payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
Vanguard Automatic Exchange Service(TM) [GRAPHIC APPEARS HERE]
Automatic method for moving a fixed amount of money from one Vanguard fund
account to another.
- --------------------------------------------------------------------------------
Vanguard Fund Express(R) [GRAPHIC APPEARS HERE]
Electronic method for buying or selling shares. You can transfer money between
your Vanguard fund account and an account at your bank, savings and loan, or
credit union on a systematic schedule or whenever you wish.
- --------------------------------------------------------------------------------
Vanguard Dividend Express(TM) [GRAPHIC APPEARS HERE]
Electronic method for transferring dividend and/or capital gains distributions
directly from your Vanguard fund account to your bank, savings and loan, or
credit union account.
- --------------------------------------------------------------------------------
Vanguard Tele-Account(R) 1-800-662-6273 (ON-BOARD) [GRAPHIC APPEARS HERE]
Toll-free 24-hour access to Vanguard fund and account information--as well as
some transactions--by using any touch-tone phone. Tele-Account provides total
return, share price, price change, and yield quotations for all Vanguard funds;
gives your account balances and history (e.g., last transaction, latest dividend
distribution); and allows you to sell or exchange fund shares.
- --------------------------------------------------------------------------------
Access Vanguard(TM) www.vanguard.com [GRAPHIC APPEARS HERE]
You can use your personal computer to perform certain transactions for most
Vanguard funds by accessing our website. To establish this service, you must
register through the website. We will then send to you, by mail, an account
access password that allows you to process the following financial and
administrative transactions online:
 .    Open a new account.*
 .    Buy, sell, or exchange shares of most funds.
 .    Change your name/address.
 .    Add/change fund options (including dividend options, Vanguard Fund Express,
     bank instructions, checkwriting, and Vanguard Automatic Exchange Service).
*Only current Vanguard shareholders can open a new account online, by exchanging
shares from other existing Vanguard accounts.
- --------------------------------------------------------------------------------
Investor Information Department: 1-800-662-7447 (SHIP) Text Telephone:
1-800-952-3335
Call Vanguard for information on our funds, fund services, and retirement
accounts, and to request literature.
- --------------------------------------------------------------------------------
Client Services Department: 1-800-662-2739 (CREW) Text Telephone: 1-800-662-2738
Call Vanguard for information on your account, account transactions, and account
statements.
- --------------------------------------------------------------------------------
Services for Clients of Vanguard's Institutional Division: 1-888-809-8102
Vanguard's Institutional Division offers a variety of specialized services for
large institutional investors, including the ability to effect account
transactions through private electronic networks and third-party recordkeepers.
- --------------------------------------------------------------------------------
<PAGE>
 
26


Types of Accounts

Individuals and institutions can establish a variety of accounts with Vanguard.
- --------------------------------------------------------------------------------
For One or More People
Open an account in the name of one (individual) or more (joint tenants) people.
- --------------------------------------------------------------------------------
For Holding Personal Trust Assets [GRAPHIC APPEARS HERE]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
For Individual Retirement Accounts [GRAPHIC APPEARS HERE]
Open a traditional IRA account or a Roth IRA account. Eligibility and other
requirements are established by federal law and Vanguard custodial account
agreements. For more information, please call 1-800-662-7447 (SHIP).
- --------------------------------------------------------------------------------
For an Organization [GRAPHIC APPEARS HERE]
Open an account as a corporation, partnership, endowment, foundation, or other
entity.
- --------------------------------------------------------------------------------
For Third-Party Trustee Retirement Investments
Open an account as a retirement trust or plan based on an existing corporate or
institutional plan. These accounts are established by the trustee of the
existing plan.
- --------------------------------------------------------------------------------
Vanguard Prototype Plans
Open a variety of retirement accounts using Vanguard prototype plans for
individuals, sole proprietorships, and small businesses. For more information,
please call 1-800-662-2003.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
A Note on Investing with Vanguard Through Other Firms
You may purchase or sell Fund shares through a financial intermediary such as a
bank, broker, or investment adviser. If you invest with Vanguard through an
intermediary, please read that firm's program materials carefully to learn of
any special rules that may apply. For example, special terms may apply to
additional service features, fees or other policies. Consult your intermediary
to determine when your order will be priced.
- --------------------------------------------------------------------------------


Buying Shares

You buy your shares at a Fund's next-determined net asset value after Vanguard
receives your request. As long as your request is received before the close of
trading on the New York Stock Exchange, generally 4 p.m. Eastern time, you will
buy your shares at that day's net asset value.
- --------------------------------------------------------------------------------
Minimum Investment to . . .
open a new account
$3,000 (regular account); $1,000 (traditional IRAs and Roth IRAs).

add to an existing account
$100 by mail or exchange; $1,000 by wire.
- --------------------------------------------------------------------------------
    
A Note on Low Balances
The Funds reserve the right to close any nonretirement account whose balance
falls below the minimum initial investment. Each Fund will deduct a $10 annual
fee in June if your nonretirement account balance at that time is below $2,500.
The fee is waived if your total Vanguard account assets are $50,000 or more.
     
- --------------------------------------------------------------------------------
By Mail to . . . [GRAPHIC APPEARS HERE]
open a new account
Complete and sign the application form and enclose your check.

add to an existing account
Mail your check with an Invest-By-Mail form detached from your confirmation
statement to the address listed on the form.
<PAGE>
 
                                                                              27


Make your check payable to: The Vanguard Group-(insert appropriate Fund number;
see below)
Vanguard LifeStrategy Income Fund-723;
Vanguard LifeStrategy Conservative Growth Fund-724;
Vanguard LifeStrategy Moderate Growth Fund-914;
Vanguard LifeStrategy Growth Fund-122
All purchases must be made in U.S. dollars, and checks must be drawn on U.S.
banks.

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 2600                                455 Devon Park Drive
Valley Forge, PA 19482-2600                  Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 2900                                455 Devon Park Drive
Valley Forge, PA 19482-2900                  Wayne, PA 19087-1815

- --------------------------------------------------------------------------------
IMPORTANT NOTE: To prevent check fraud, Vanguard will not accept checks made
payable to third parties.
- --------------------------------------------------------------------------------
By Telephone to . . . [GRAPHIC APPEARS HERE]
open a new account
Call Vanguard Tele-Account* 24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same
registration (name, address, taxpayer identification number, and account
type).

add to an existing account
Call Vanguard Tele-Account* 24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same
registration (name, address, taxpayer identification number, and account
type). Use Vanguard Fund Express (see "Services and Account Features") to
transfer assets from your bank account. Call Client Services before your
first use to verify that this option is in place.

Vanguard Tele-Account                        Client Services
1-800-662-6273                               1-800-662-2739

*You must obtain a Personal Identification Number through Tele-Account at
least seven days before you request your first exchange.
- --------------------------------------------------------------------------------
IMPORTANT NOTE: Once you've requested a telephone transaction and a confirmation
number has been assigned, the transaction cannot be revoked. We reserve the
right to refuse any purchase request.
- --------------------------------------------------------------------------------
By Wire to Open a New Account or Add to an Existing Account  [GRAPHIC APPEARS 
HERE]
Call Client Services to arrange your wire transaction. Wire transactions
are not available for retirement accounts, except for asset transfers and direct
rollovers.
    
Wire to:
FRB ABA 021001088
HSBC Bank USA
     
For credit to:
Account: 000112046
Vanguard Incoming Wire Account

In favor of:
Vanguard LifeStrategy Income Fund-723;
Vanguard LifeStrategy Conservative Growth Fund-724;
Vanguard LifeStrategy Moderate Growth Fund-914;
Vanguard LifeStrategy Growth Fund-122
<PAGE>
 
28

Buying Shares (continued)

[Account number, or temporary number for a new account]
[Registered account owner/s]
[Registered address]
- --------------------------------------------------------------------------------
  You can redeem (that is, sell or exchange) shares purchased by check or 
Vanguard Fund Express at any time. However, while your redemption request will
be processed at the next-determined net asset value after it is received, your
redemption proceeds will not be available until payment for your purchase is
collected, which may take up to ten calendar days.
- --------------------------------------------------------------------------------
A Note on Large Purchases
It is important that you call Vanguard before you invest a large dollar amount.
We must consider the interests of all Fund shareholders and so reserve the right
to refuse any purchase that will disrupt the Fund's operation or performance.
- --------------------------------------------------------------------------------


Redeeming Shares

This section describes how you can redeem--that is, sell or exchange--a Fund's
shares.

When Selling Shares:
 .    Vanguard sends the redemption proceeds to you or a designated third party.*
 .    You can sell all or part of your Fund shares at any time.

*May require a signature guarantee; see footnote on page 30.

When Exchanging Shares:
 .    The redemption proceeds are used to purchase shares of a different Vanguard
     fund.
 .    You must meet the receiving fund's minimum investment requirements.
 .    Vanguard reserves the right to revise or terminate the exchange privilege,
     limit the amount of an exchange, or reject an exchange at any time, without
     notice.

In both cases, your transaction will be based on the Fund's next-determined
share price, subject to any special rules discussed in this prospectus. For
exchanges, the purchase side of the transaction will be based on the receiving
fund's next-determined share price, again subject to any special rules discussed
in this prospectus.
    
- --------------------------------------------------------------------------------
Note: Once a redemption is requested and a confirmation number given, the
transaction cannot be canceled.
- --------------------------------------------------------------------------------
     
HOW TO REQUEST A REDEMPTION
You can request a redemption from your Fund account in any one of three ways:
online, by telephone, or by mail.
- --------------------------------------------------------------------------------
Online Requests [GRAPHIC APPEARS HERE]
Access Vanguard at www.vanguard.com
You can use your personal computer to sell or exchange shares of most Vanguard
funds by accessing our website. To establish this service, you must register
through the website. We will then send you, by mail, an account access password
that will enable you to sell or exchange shares online (as well as perform other
transactions).
     Note: The Vanguard funds whose shares you cannot exchange online or by
telephone are Vanguard U.S. Stock Index Funds, Vanguard Balanced Index Fund,
Vanguard International Stock Index Funds, Vanguard REIT Index Fund, Vanguard
Total International Stock Index Fund, and Vanguard Growth and Income Fund. These
funds do, however, permit online and telephone exchanges within IRAs and other
retirement accounts. If you sell shares of these funds online, you will receive
a redemption check at your address of record.
- --------------------------------------------------------------------------------
<PAGE>
 
                                                                              29
- --------------------------------------------------------------------------------
Telephone Requests [GRAPHIC APPEARS HERE]
All Account Types Except Retirement:
Call Vanguard Tele-Account 24 hours a day--or Client Services during business
hours--to sell or exchange shares. You can exchange shares from these Funds to
open an account in another Vanguard fund or to add to an existing Vanguard fund
account with an identical registration.

Retirement Accounts:
You can exchange--but not sell--shares by calling Tele-Account or Client 
Services.

Vanguard Tele-Account                   Client Services
1-800-662-6273                          1-800-662-2739
- --------------------------------------------------------------------------------
SPECIAL INFORMATION: We will automatically establish the telephone redemption
option for your account, unless you instruct us otherwise in writing. While
telephone redemption is easy and convenient, this account feature involves a
risk of loss from unauthorized or fraudulent transactions. Vanguard will take
reasonable precautions to protect your account from fraud. You should do the
same by keeping your account information private and immediately reviewing any
account statements that we send to you. Make sure to contact Vanguard
immediately about any transaction you believe to be unauthorized.
- --------------------------------------------------------------------------------
We reserve the right to refuse a telephone redemption if the caller is unable to
provide:
[X]  The ten-digit account number.
[X]  The name and address exactly as registered on the account.
[X]  The primary Social Security or employer identification number as registered
     on the account.
[X]  The Personal Identification Number, if applicable.
Please note that Vanguard will not be responsible for any account losses due to
telephone fraud, so long as we have taken reasonable steps to verify the
caller's identity. If you wish to remove the telephone redemption feature from
your account, please notify us in writing.
- --------------------------------------------------------------------------------
A Note on Unusual Circumstances
Vanguard reserves the right to revise or terminate the telephone redemption
privilege at any time, without notice. In addition, Vanguard can stop selling
shares or postpone payment at times when the New York Stock Exchange is closed
or under any emergency circumstances as determined by the U.S. Securities and
Exchange Commission. If you experience difficulty making a telephone redemption
during periods of drastic economic or market change, you can send us your
request by regular or express mail. Follow the instructions on selling or
exchanging shares by mail in this section.
- --------------------------------------------------------------------------------
Mail Requests [GRAPHIC APPEARS HERE]
All Account Types Except Retirement:
Send a letter of instruction signed by all registered account holders. Include
the fund name and account number and (if you are selling) a dollar amount or
number of shares OR (if you are exchanging) the name of the fund you want to
exchange into and a dollar amount or number of shares. To exchange into an
account with a different registration (including a different name, address,
taxpayer identification number, or account type), you must provide Vanguard with
written instructions that include the guaranteed signatures of all current
owners of the fund from which you wish to redeem.

Vanguard Retirement Accounts:
For information on how to request distributions from:
 .    Traditional IRAs and Roth IRAs--call Client Services.
 .    SEP-IRAs, SIMPLE IRAs, 403(b)(7) custodial accounts, and Profit-Sharing and
     Money Purchase Pension (Keogh) Plans--call Individual Retirement Plans at
     1-800-662-2003.

Depending on your account registration type, additional documentation may be
required. 

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 1120                                455 Devon Park Drive
Valley Forge, PA 19482-1120                  Wayne, PA 19087-1815
<PAGE>
 
30

Redeeming Shares (continued)

For clients of Vanguard's Institutional Division

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 2900                                455 Devon Park Drive
Valley Forge, PA 19482-2900                  Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
A Note on Large Redemptions
It is important that you call Vanguard before you redeem a large dollar amount.
We must consider the interests of all fund shareholders and so reserve the right
to delay delivery of your redemption proceeds--up to seven days--if the amount
will disrupt the Fund's operation or performance. If you redeem more than
$250,000 worth of Fund shares within any 90-day period, the Fund reserves the
right to pay part or all of the redemption proceeds above $250,000 in kind,
i.e., in securities, rather than in cash.
- --------------------------------------------------------------------------------

OPTIONS FOR REDEMPTION PROCEEDS
You may receive your redemption proceeds in one of two ways: check, or exchange
to another Vanguard fund.
- --------------------------------------------------------------------------------
Check Redemptions
Normally, Vanguard will mail your check within two business days of a
redemption.
- --------------------------------------------------------------------------------
Exchange Redemptions
As described above, an exchange involves using the proceeds of your redemption
to purchase shares of another Vanguard fund.
- --------------------------------------------------------------------------------

FOR OUR MUTUAL PROTECTION
For your best interests and ours, Vanguard applies these additional requirements
to redemptions:

Request in "Good Order" 
All redemption requests must be received by Vanguard in "good order." This means
that your request must include:
[X]  The Fund name and account number.
[X]  The amount of the transaction (in dollars or shares).
[X]  Signatures of all owners exactly as registered on the account (for mail
     requests).
[X]  Signature guarantees (if required).*
[X]  Any supporting legal documentation that may be required.
[X]  Any outstanding certificates representing shares to be redeemed.

*For instance, a signature guarantee must be provided by all registered account
shareholders when redemption proceeds are to be sent to a different person or
address. A signature guarantee can be obtained from most banks, credit unions,
and licensed brokers.

Transactions are processed at the next-determined share price after Vanguard has
received all required information.
- --------------------------------------------------------------------------------
Limits on Account Activity
Because excessive account transactions can disrupt management of the Fund and
increase the Fund's costs for all shareholders, Vanguard limits account activity
as follows:
 .    You may make no more than two substantive "round trips" through each of the
     Funds during any 12-month period.
 .    Your round trips through the Fund must be at least 30 days apart.
 .    A Fund may refuse a share purchase at any time, for any reason.
 .    Vanguard may revoke an investor's telephone exchange privilege at any time,
     for any reason.

A "round trip" is a redemption from one of the Funds followed by a purchase back
into the same Fund. Also, "round trip" covers transactions accomplished by any
combination of methods, including transactions conducted by check, wire, or
exchange to/from another Vanguard fund. "Substantive" means a dollar amount that
Vanguard determines, in its sole discretion, could adversely affect the
management of that Fund.
- --------------------------------------------------------------------------------
<PAGE>
 
                                                                              31
- --------------------------------------------------------------------------------
Return Your Share Certificates
Any portion of your account represented by share certificates cannot be redeemed
until you return the certificates to Vanguard. Certificates must be returned
(unsigned), along with a letter requesting the sale or exchange you wish to
process, via certified mail to:

The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
All Trades Final
Vanguard will not cancel any transaction request (including any purchase or
redemption) that we believe to be authentic once the request has been received
and a confirmation number assigned.
- --------------------------------------------------------------------------------

Transferring Registration

You can transfer the registration of your Fund shares to another owner by
completing a transfer form and sending it to Vanguard.

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 1110                                455 Devon Park Drive
Valley Forge, PA 19482-1110                  Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:                         Express or Registered mail to:
The Vanguard Group                           The Vanguard Group
P.O. Box 2900                                455 Devon Park Drive
Valley Forge, PA 19482-2900                  Wayne, PA 19087-1815
- --------------------------------------------------------------------------------

Fund and Account Updates

STATEMENTS AND REPORTS

We will send you account and tax statements to help you keep track of your Fund
account throughout the year as well as when you are preparing your income tax
returns.
     In addition, you will receive financial reports about your Fund twice a
year. These comprehensive reports include an assessment of the Fund's
performance (and a comparison to its industry benchmark), an overview of the
markets, a report from the advisers, and the Fund's financial statements which
include a listing of the Fund's holdings.
    
     To keep the Funds' costs as low as possible (so that you and other
shareholders can keep more of the Funds' investment earnings), Vanguard attempts
to eliminate duplicate mailings to the same address. When we find that two or
more Fund shareholders have the same last name and address, we send just one
Fund report to that address--instead of mailing separate reports to each
shareholder. If you want us to send separate reports, however, you may notify
our Client Services Department at 1-800-662-2739.      
- --------------------------------------------------------------------------------
Confirmation Statement
Sent each time you buy, sell, or exchange shares; confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
Portfolio Summary [GRAPHIC APPEARS HERE]
Mailed quarterly for most accounts; shows the market value of your account at
the close of the statement period, as well as distributions, purchases, sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------
<PAGE>
 
32

Fund and Account Updates (continued)

- --------------------------------------------------------------------------------
Fund Financial Reports
Mailed in February and August for these Funds.
- --------------------------------------------------------------------------------
Tax Statements
Generally mailed in January; report previous year's dividend and capital gains
distributions, proceeds from the sale of shares, and distributions from IRAs or
other retirement accounts.
- --------------------------------------------------------------------------------
Average Cost Review Statement [GRAPHIC APPEARS HERE]
Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average cost of shares that you redeemed during the calendar year,
using the average cost single category method.
- --------------------------------------------------------------------------------
<PAGE>
 
Glossary of Investment Terms

Active Management
An investment approach that seeks to exceed the average returns of the financial
markets. Active managers rely on research, market forecasts, and their own
judgment and experience in selecting securities to buy and sell.
                           
Balanced Fund
A mutual fund that seeks to provide some combination of income, capital growth,
and conservation of capital by investing in stocks, bonds, and/or money market
instruments.

Bond
A debt security (IOU) issued by a corporation, government, or government agency
in exchange for the money you lend it. In most instances, the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date.

Capital Gains Distribution
Payment to mutual fund shareholders of gains realized on securities that the
fund has sold at a profit, minus any realized losses.

Cash Reserves
Cash deposits as well as short-term bank deposits and money market instruments
which include U.S. Treasury bills, bank certificates of deposit (CDs),
repurchase agreements, commercial paper, and banker's acceptances.

Common Stock
A security representing ownership rights in a corporation. A stockholder is
entitled to share in the company's profits, some of which may be paid out as
dividends.

Dividend Income
Payment to shareholders of income from interest or dividends generated by a
fund's investments.

Expense Ratio
The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any
12b-1 distribution fees.

Fund of Funds
A mutual fund that pursues its objective by investing in other mutual funds
rather than in individual securities.

Investment Adviser                   
An organization that makes the day-to-day decisions regarding a fund's
investments.

Mutual Fund                          
An investment company that pools the money of many people and invests it in a
variety of securities in an effort to achieve a specific objective over time.
                                     
Net Asset Value (NAV)                
The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price. 

Passive Management 
A low-cost investment strategy in which a mutual fund attempts to match--rather 
than outperform--a particular stock or bond market index.  Also known as 
indexing.

Price/Earnings (P/E) Ratio           
The current share price of a stock, divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share, has
a price/earnings ratio of 10.
                                     
Total Return                         
A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.
                                     
Volatility                           
The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.
                                     
Yield                                
Income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price.
<PAGE>
 
                                        [LOGO OF VANGUARD GROUP(R) APPEARS HERE]

                                                 Post Office Box 2600
                                                 Valley Forge, PA 19482-2600

For More Information
If you'd like more information about Vanguard LifeStrategy Funds, the following
documents are available free upon request: 

Annual/Semiannual Report to Shareholders
Additional information about the Funds' investments is available in the Funds'
annual and semiannual reports to shareholders. In these reports, you will find a
discussion of the market conditions and investment strategies that significantly
affected the Funds' performance during the most recent fiscal year.
                             
Statement of Additional Information (SAI) 
The SAI provides more detailed information about the Funds.
                             
The current annual and semiannual reports and the SAI are incorporated by
reference into (and are thus legally a part of) this prospectus.
                             
To receive a free copy of the latest annual or semiannual report or the SAI, or
to request additional information about the Funds or other Vanguard funds,
please contact us as follows:
                                     
The Vanguard Group
Investor Information Department
P.O. Box 2600
Valley Forge, PA 19482-2600                       

Telephone:
1-800-662-7447 (SHIP)                              
                                     
Text Telephone:
1-800-952-3335
                                     
World Wide Web:
www.vanguard.com
                             
If you are a current Fund shareholder and would like information about your
account, account transactions, and/or account statements, please call:
                                 
Client Services Department
Telephone: 1-800-662-2739 (CREW)                         
                                 
Text Telephone:       
1-800-662-2738
                                 
Information provided by the Securities and Exchange Commission (SEC)
You can review and copy information about the Funds (including the SAI) at the
SEC's Public Reference Room in Washington, D.C. To find out more about this
public service, call the SEC at 1-800-SEC-0330. Reports and other information
about the Funds are also available on the SEC's website (www.sec.gov), or you
can receive copies of this information, for a fee, by writing the Public
Reference Section, Securities and Exchange Commission, Washington, DC
20549-6009.
                                                              
Funds' Investment Company Act
file number: 811-3919

(C) 1999 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

P088N-04/30/1999
<PAGE>
 
Vanguard LifeStrategy Funds

Participant Prospectus
April 30, 1999

A Group of Balanced Mutual Funds

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

      Contents

 1 Fund Profiles 

     1  Vanguard LifeStrategy Income Fund 

     4  Vanguard LifeStrategy Conservative Growth Fund 

     7  Vanguard LifeStrategy Moderate Growth Fund 

     10 Vanguard LifeStrategy Growth Fund 

13 More on the Funds 

18 The Funds and Vanguard

19 Investment Adviser 

19 Year 2000 Challenge 

20 Dividends, Capital Gains, and Taxes 

20 Share Price 

21 Financial Highlights 

24 Investing with Vanguard 

24 Accessing Fund Information by Computer 

Glossary (inside back cover)

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

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

Why Reading This Prospectus Is Important

This prospectus explains the objective, risks, and strategies of each of the
Vanguard LifeStrategy Funds. To highlight terms and concepts important to mutual
fund investors, we have provided "Plain Talk(R)" explanations along the way.
Reading the prospectus will help you to decide which Fund, if any, is the right
investment for you. We suggest that you keep it for future reference. 

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

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

Important Note 

This prospectus is intended for participants in employer-sponsored retirement or
savings plans. Another version for investors who would like to open a personal
investment account can be obtained by calling Vanguard at 1-800-662-7447. 

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



Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.

<PAGE>
 
                                                                               1
    
This prospectus provides information about the Vanguard LifeStrategy Funds, a
group of balanced mutual funds that invest a fixed percentage of assets in up to
five other Vanguard stock and bond mutual funds. Because they invest in other
funds, rather than in individual securities, each Fund is considered a"fund of
funds." The allocation to stocks and bonds in each LifeStrategy Fund reflects
its greater or lesser orientation toward income and growth of capital. The
profiles below summarize each Fund's objective and other key features. Following
the profiles, there is important additional information about the Funds.     

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                                  Fund of Funds

The term "fund of funds" is used to describe a mutual fund that pursues its
objective by investing in other mutual funds rather than in individual stocks or
bonds. A fund of funds may charge for its own direct expenses, in addition to
bearing a proportionate share of the expenses charged by the underlying funds in
which it invests. Funds of funds are best suited for long-term investors. 

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

Fund Profile--Vanguard LifeStrategy Income Fund
    
The following profile summarizes key features of Vanguard LifeStrategy Income
Fund.     

Investment Objective

The Fund seeks to provide current income and some growth of capital.

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 80% of assets to bonds and 20%
to common stocks. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows: 

 .    Vanguard Total Bond Market Index Fund         50%

 .    Vanguard Asset Allocation Fund                25%

 .    Vanguard Short-Term Corporate Fund            20%

 .    Vanguard Total Stock Market Index Fund         5%

Primary Risks 

The Fund's total return, like bond and stock prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Interest rate risk, which is the chance that bond prices overall will 
     decline over short or even long periods due to rising interest rates. 
     Interest rate risk should be moderate.                                 
 
 .    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be moderate.

 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its high-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low to moderate. 

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing an underlying Fund's
     return. Credit risk should be low.
     
 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be low.      


<PAGE>
 
2

Fund Profile--Vanguard LifeStrategy Income Fund (continued)

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Income Fund to underperform other
     funds with similar investment objectives.

Performance/Risk Information
    
The bar chart and table below provide an indication of the risks of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception. The table shows how the Fund's average annual returns for one
calendar year and since inception compare with those of a broad-based securities
market index and a composite stock/bond index weighted to match the Fund's
target allocation. Keep in mind that the Fund's past performance does not
indicate how it will perform in the future.

- --------------------------------------------------------------------------------
                              Annual Total Returns
- --------------------------------------------------------------------------------

                           [BAR CHART APPEARS HERE]

1995    22.99%
1996     7.65%
1997    14.23%
1998    13.17%

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

     During the period shown in the bar chart, the highest return for a calendar
quarter was 6.93% (quarter ended June 30, 1995) and the lowest return for a
quarter was -0.01% (quarter ended March 31, 1996).

- --------------------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
- --------------------------------------------------------------------------------
                                        1 Year              Since Inception*
- --------------------------------------------------------------------------------
Vanguard LifeStrategy Income Fund       13.17%                 13.53%
Lehman Aggregate Bond Index              8.69                   9.46
Income Composite Index**                11.22                  11.91
- --------------------------------------------------------------------------------
     
 * September 30, 1994.

** Derived by applying the Fund's target allocation to the results of the
   following benchmarks: for U.S. stocks, the Wilshire 5000 Equity Index; for
   bonds, the Lehman Brothers Aggregate Bond Index; and for cash reserves, the
   Salomon Smith Barney 3-Month U.S. Treasury Bill Index.
- --------------------------------------------------------------------------------

Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment)

Sales Charge (Load) Imposed on Purchases:                            None
Sales Charge (Load) Imposed on Reinvested Dividends:                 None
Redemption Fees:                                                     None
Exchange Fees:                                                       None
<PAGE>
 
                                                                               3
    
Annual Fund Operating Expenses (expenses deducted from the underlying Funds'
assets) 

Indirect Operating Expenses:*

* Although the Fund incurs no net expenses directly, the Fund's shareholders
  indirectly bear the expenses of the underlying Vanguard funds in which the
  Fund invests. See The Funds and Vanguard. The Fund's indirect expense ratio,
  based on its investments in the underlying Vanguard funds, was 0.29% as of
  December 31, 1998.     

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.
    
                --------------------------------------------
                   1 Year    3 Years   5 Years    10 Years 
                --------------------------------------------
                    $30        $93      $163       $368 
                --------------------------------------------
     
This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information 

Dividends and Capital Gains 

Dividends are distributed quarterly in March, June, September, and December;
capital gains, if any, are distributed annually in December

Investment Advisor 

The Fund does not employ an investment advisor, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date 

September 30, 1994 

Net Assets as of December 31, 1998 
    
$449 million      

Newspaper Abbreviation 

LifeInc 

Vanguard Fund Number 

723 

Cusip Number

921909206 

Ticker Symbol 

VASIX
<PAGE>
 
4

Fund Profile--Vanguard LifeStrategy Conservative Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy
Conservative Growth Fund.

Investment Objective

The Fund seeks to provide current income and low to moderate growth of capital.

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 60% of assets to bonds and 40%
to common stocks. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows: 

 .    Vanguard Total Bond Market Index Fund             30% 
 .    Vanguard Asset Allocation Fund                    25%
 .    Vanguard Short-Term Corporate Fund                20%
 .    Vanguard Total Stock Market Index Fund            20%
 .    Vanguard Total International Stock Index Fund      5%

Primary Risks 

The Fund's total return, like bond and stock prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be moderate.

 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be moderate.
    
 .    Income risk, which is the chance that falling interest rates will cause the
     Fund's income to decline. Income risk should be low to moderate.     

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing an underlying fund's
     return. Credit risk should be low.
    
 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its high-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low.     

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Conservative Growth Fund to
     underperform other funds with similar investment objectives.

Performance/Risk Information 
    
The bar chart and table on the following page provide an indication of the risks
of investing in the Fund. The bar chart shows the Fund's performance in each
calendar year since inception. The table shows how the Fund's average annual
returns for one calendar year and since inception compare with those of broad-
based stock and bond market indexes and a composite stock/bond index weighted to
match the Fund's target allocation. Keep in mind that the Fund's past
performance does not indicate how it will perform in the future.     
<PAGE>
 
                                                                               5
    
- --------------------------------------------------------------------------------
                              Annual Total Returns
- --------------------------------------------------------------------------------

                           [BAR CHART APPEARS HERE]

1995     24.35%
1996     10.36%
1997     16.81%
1998     15.88%

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

     During the period shown in the bar chart, the highest return for a calendar
quarter was 8.84% (quarter ended December 31, 1998) and the lowest return for a
quarter was -2.44% (quarter ended September 30, 1998).     

    
- --------------------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
- --------------------------------------------------------------------------------
                                                  1 Year       Since Inception*
- --------------------------------------------------------------------------------
Vanguard LifeStrategy Conservative Growth Fund    15.88%           15.70%
Lehman Aggregate Bond Index                        8.69             9.46
Wilshire 5000 Index                               23.39            25.87
Conservative Growth Composite Index**             14.19            14.37
- --------------------------------------------------------------------------------
     
 * September 30, 1994.

** Derived by applying the Fund's target allocation to the results of the
   following benchmarks: for U.S. stocks, the Wilshire 5000 Equity Index; for
   international stocks, the Total International Composite Index; for bonds, the
   Lehman Brothers Aggregate Bond Index; and for cash reserves, the Salomon
   Smith Barney 3-Month U.S. Treasury Bill Index.
- --------------------------------------------------------------------------------

Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment) 

Sales Charge (Load)Imposed on Purchases:                              None 
Sales Charge (Load) Imposed on Reinvested Dividends:                  None 
Redemption Fees:                                                      None 
Exchange Fees:                                                        None 
    
Annual Fund Operating Expenses(expenses deducted from the underlying funds'
assets)

Indirect Operating Expenses: 

* Although the Fund incurs no net expenses directly, the Fund's shareholders
  indirectly bear the expenses of the underlying Vanguard funds in which the
  Fund invests. See The Funds and Vanguard. The Fund's indirect expense ratio,
  based on its investments in the underlying Vanguard funds, was 0.29% as of
  December 31, 1998.     
<PAGE>
 
6

Fund Profile--Vanguard LifeStrategy Conservative Growth Fund(continued)

The following example is intended to help you compare the cost of investing in
other mutual funds. It illustrates the hypothetical expenses that you would
incur over various periods if you invest $10,000 in the Fund. This example
assumes that the Fund provides a return of 5% a year, and that operating
expenses of the Fund and its underlying funds remain the same. The results apply
whether or not you redeem your investment at the end of each period.
    
        -------------------------------------------------------------
           1 Year         3 Years         5 Years          10 Years 
        -------------------------------------------------------------
            $30             $93             $163             $368
        -------------------------------------------------------------
     
     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information 

Dividends and Capital Gains 
    
Dividends are distributed quarterly in March, June, September, and December;
capital gains, if any, are distributed annually in December      

Investment Adviser 

The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date 

September 30, 1994

Net Assets as of December 31, 1998
    
$1.4 billion      

Newspaper Abbreviation

LifeCon

Vanguard Fund Number

724

Cusip Number

921909305

Ticker Symbol

VSCGX
<PAGE>
 
                                                                               7

Fund Profile--Vanguard LifeStrategy Moderate Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy Moderate
Growth Fund. 

Investment Objective 
    
The Fund seeks to provide growth of capital and a low to moderate level of
current income.    

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 60% of assets to common stocks
and 40% to bonds. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows: 

 .    Vanguard Total Stock Market Index Fund          35%
 .    Vanguard Total Bond Market Index Fund           30%
 .    Vanguard Asset Allocation Fund                  25%
 .    Vanguard Total International Stock Index Fund   10%

Primary Risks 

The Fund's total return, like stock and bond prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be moderate to
     high.

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be moderate. 

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Moderate Growth Fund to
     underperform other funds with similar investment objectives. 

 .    Credit risk, which is the chance that a bond issuer will fail to pay
     interest and principal in a timely manner, reducing the Fund's return.
     Credit risk should be low. 

 .    Prepayment risk, which is the chance that during periods of falling
     interest rates, a bond issuer will repay its high-yielding bond earlier
     than expected. Forced to reinvest the unanticipated proceeds at lower
     rates, an underlying fund, and indirectly the Fund, would experience a
     decline in income. Prepayment risk should be low.

 .    Currency risk, which is the chance that returns will be hurt by a rise in
     the value of the U.S. dollar versus foreign currencies. Because only a
     small portion of the Fund's assets will be invested in Vanguard Total
     International Stock Index Fund, currency risk should be low. 

 .    Country risk, which is the chance that unfavorable developments in a
     particular country--for example, political troubles, financial problems,
     or natural disasters--will harm Vanguard Total International Stock Index
     Fund's performance and therefore, the performance of the Life Strategy
     Moderate Growth Fund. Because only a small portion of the Fund's assets
     will be invested in Vanguard Total International Stock Index Fund, country
     risk should be low.      

Performance/Risk Information
    
The bar chart and table on the following page provide an indication of the risks
of investing in the Fund. The bar chart shows the Fund's performance in each
calendar year since inception. The table shows how the Fund's average annual
returns for one calendar year and since inception compare with those of broad-
based stock and bond market indexes and a composite stock/bond index weighted to
match the Fund's target allocation. Keep in mind that the Fund's past
performance does not indicate how it will perform in the future.     
<PAGE>
 
8

Fund Profile--Vanguard LifeStrategy Moderate Growth Fund (continued)
    
- --------------------------------------------------------------------------------
                              Annual Total Returns
- --------------------------------------------------------------------------------
1995         27.94%
1996         12.71%
1997         19.77%
1998         19.03%
- --------------------------------------------------------------------------------
         
     During the period shown in the bar chart, the highest return for a calendar
quarter was 13.08% (quarter ended December 31, 1998) and the lowest return for a
quarter was -5.52% (quarter ended September 30, 1998).

- --------------------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
- --------------------------------------------------------------------------------
                                             1 Year         Since Inception*
- --------------------------------------------------------------------------------
Vanguard LifeStrategy Moderate Growth Fund    19.03%            18.27%
Lehman Aggregate Bond Index                    8.69              9.46
Wilshire 5000 Index                           23.39             25.87
Moderate Growth Composite Index**             17.83             17.69
- --------------------------------------------------------------------------------
     
 * September 30, 1994.
** Derived by applying the Fund's target allocation to the results of the
   following benchmarks: for U.S. stocks, the Wilshire 5000 Equity Index; for
   international stocks, the Total International Composite Index; for bonds, the
   Lehman Brothers Aggregate Bond Index; and for cash reserves, the Salomon
   Smith Barney 3-Month U.S. Treasury Bill Index.
- --------------------------------------------------------------------------------

Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment) 

Sales Charge (Load) Imposed on Purchases:                        None 
Sales Charge (Load) Imposed on Reinvested Dividends:             None 
Redemption Fees:                                                 None 
Exchange Fees:                                                   None 
    
Annual Fund Operating Expenses (expenses deducted from the underlying funds' 
assets) 

Indirect Operating Expenses: 

* Although the Fund incurs no net expenses directly, the Fund's shareholders
  indirectly bear the expenses of the underlying Vanguard funds in which the
  Fund invests. See The Funds and Vanguard. The Fund's indirect expense ratio,
  based on its investments in the underlying funds, was 0.29% as of December 31,
  1998.     
<PAGE>
 
                                                                               9

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.
    
                 ---------------------------------------------
                   1 Year      3 Years   5 Years    10 Years
                 ---------------------------------------------
                    $30          $93      $163        $368
                 ---------------------------------------------
     
     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information

Dividends and Capital Gains
    
Dividends are distributed semiannually in June and December; capital gains, if
any, are distributed annually in December      

Investment Adviser 
The Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date
September 30, 1994
    
Net Assets as of December 31, 1998
$2.2 billion      

Newspaper Abbreviation
LifeMod

Vanguard Fund Number
914

Cusip Number
921909404

Ticker Symbol
VSMGX
<PAGE>
 
10

Fund Profile--Vanguard LifeStrategy Growth Fund

The following profile summarizes key features of Vanguard LifeStrategy Growth
Fund.

Investment Objective

The Fund seeks to provide growth of capital and some current income.

Investment Strategies

The Fund invests in other Vanguard mutual funds according to a fixed formula
that typically results in an allocation of about 80% of assets to common stocks
and 20% to bonds. The percentages of the Fund's assets allocated to each of the
underlying funds are as follows: 

 .    Vanguard Total Stock Market Index Fund          50% 
 .    Vanguard Asset Allocation Fund                  25%
 .    Vanguard Total International Stock Index Fund   15%
 .    Vanguard Total Bond Market Index Fund           10%

Primary Risks 

The Fund's total return, like stock and bond prices generally, will fluctuate
within a wide range, so an investor could lose money over short or even long
periods. The Fund is also subject to:
    
 .    Stock market risk, which is the chance that stock prices in general will
     decline over short or even long periods. The stock market tends to be
     cyclical, with periods when stock prices generally rise and periods when
     stock prices generally decline. Stock market risk should be high.

 .    Manager risk, which is the chance that the adviser of Vanguard Asset
     Allocation Fund may do a poor job of deciding on allocations to each asset
     class. This could cause the LifeStrategy Growth Fund to underperform other
     funds with similar investment objectives.

 .    Interest rate risk, which is the chance that bond prices overall will
     decline over short or even long periods due to rising interest rates.
     Interest rate risk should be low.

 .    Currency risk, which is the chance that returns of Vanguard Total
     International Stock Index Fund will be hurt by a rise in the value of the
     U.S. dollar versus foreign currency. Because only a small portion of the
     Fund's assets will be invested in the Total International Stock Index Fund,
     currency risk should be low. 

 .    Country risk, which is the chance that unfavorable developments in a
     particular country--for example, political troubles, financial problems, or
     natural disasters--will harm the Vanguard Total International Stock Index
     Fund's performance and therefore the performance of the Life Strategy
     Growth Fund. Because only a small portion of the Fund's assets will be
     invested in the Vanguard Total International Stock Index Fund, country risk
     should be low.     

Performance/Risk Information 
    
The bar chart and table below provide an indication of the risks of investing in
the Fund. The bar chart shows the Fund's performance in each calendar year since
inception. The table shows how the Fund's average annual returns for one
calendar year and since inception compare with those of a
broad-based stock market index and a composite stock/bond index weighted
to match the Fund's target allocation. Keep in mind that the Fund's past
performance does not indicate how it will perform in the future.     
<PAGE>
 
                                                                              11
    
- --------------------------------------------------------------------------------
                             Annual Total Returns
- --------------------------------------------------------------------------------

                           [BAR CHART APPEARS HERE]

1995     29.24%
1996     15.41%
1997     22.26%
1998     21.40%

- --------------------------------------------------------------------------------
     During the period shown in the bar chart, the highest return for a calendar
quarter was 17.31% (quarter ended December 31, 1998) and the lowest return for a
quarter was -8.84% (quarter ended September 30, 1998).

- --------------------------------------------------------------------------------
         Average Annual Total Returns for Years Ended December 31, 1998
- --------------------------------------------------------------------------------
                                         1 Year                Since Inception*
- --------------------------------------------------------------------------------
Vanguard LifeStrategy Growth Fund        21.40%                   20.52%
Wilshire 5000 Index                      23.39                    25.87
Growth Composite Index**                 20.48                    20.09
- --------------------------------------------------------------------------------
     
 * September 30, 1994.
** Derived by applying the Fund's target allocation to the results of the
   following benchmarks: for U.S. stocks, the Wilshire 5000 Equity Index; for
   international stocks, the Total International Composite Index; for bonds, the
   Lehman Brothers Aggregate Bond Index; and for cash reserves, the Salomon
   Smith Barney 3-Month U.S. Treasury Bill Index.
- --------------------------------------------------------------------------------

Fees and expenses

The following table describes the fees and expenses you would pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended December 31, 1998.

Shareholder Fees (fees paid directly from your investment)

Sales Charge (Load) Imposed on Purchases:                             None
Sales Charge (Load) Imposed on Reinvested Dividends:                  None
Redemption Fees:                                                      None
Exchange Fees:                                                        None
    
Annual Fund Operating Expenses (expenses deducted from the underlying funds'
assets) 

Indirect Operating Expenses                                              *

* Although the Fund incurs no net expenses directly, the Fund's shareholders
  indirectly bear the expenses of the underlying Vanguard funds in which the
  Fund invests. See The Funds and Vanguard. The Fund's indirect expense ratio,
  based on its investments in the underlying funds, was 0.29%% as of December
  31, 1998.     
<PAGE>
 
12

Fund Profile--Vanguard LifeStrategy Growth Fund (continued)

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical expenses that you would incur over various periods if you invest
$10,000 in the Fund. This example assumes that the Fund provides a return of 5%
a year, and that operating expenses of the Fund and its underlying funds remain
the same. The results apply whether or not you redeem your investment at the end
of each period.

                  ------------------------------------------ 
                    1 Year    3 Years   5 Years   10 Years 
                  ------------------------------------------ 
                     $30        $93      $163       $368 
                  ------------------------------------------ 

     This example should not be considered to represent actual expenses or
performance from the past or for the future. Actual future expenses may be
higher or lower than those shown.

Additional Information

Dividends and Capital Gains
    
Dividends are distributed semiannually in June and December; capital gains, if
any, are distributed annually in December      

Investment Adviser 

Fund does not employ an investment adviser, but benefits from the investment
advisory services provided to the underlying Vanguard funds in which it invests

Inception Date

September 30, 1994                          

Net Assets as of December 31, 1998
    
$1.9 billion      

Newspaper Abbreviation

LifeGro

Vanguard Fund Number

122

Cusip Number

921909503

Ticker Symbol

VASGX
<PAGE>
 
                                                                              13

More on the Funds

The following sections discuss other important features of the Vanguard
LifeStrategy Funds. You will find information about the risks of investing in
each Fund throughout these sections.

Asset Allocation Framework 

Asset allocation--that is, dividing your investment among stocks, bonds, and 
cash reserves is one of the most critical decisions an investor makes. Selecting
the appropriate mix should be based on personal investment objectives, time
horizons, and risk tolerances. The LifeStrategy Funds offer varying degrees of
risk and reward by holding different combinations of assets, thereby providing
shareholders with a simple way to meet investment needs at different stages of
life.
    
     Each Fund invests in up to five underlying Vanguard funds to pursue a
target allocation of stocks, bonds, and cash instruments*. Because one of the
underlying funds (Vanguard Asset Alloction Fund) periodically shifts its
holdings among asset classes, each LifeStrategy Fund's asset mix can fluctuate
within a prescribed range. The tables below illustrate the expected asset
allocation and the potential allocation ranges for each Fund:      

- --------------------------------------------------------------------------------
                            Expected Asset Allocation
- --------------------------------------------------------------------------------
                                           Stocks          Bonds          Cash*
- --------------------------------------------------------------------------------
LifeStrategy Income Fund                     20%            80%            0%
LifeStrategy Conservative Growth Fund        40%            60%            0% 
LifeStrategy Moderate GrowthFund             60%            40%            0% 
LifeStrategy Growth Fund                     80%            20%            0%
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                        Potential Asset Allocation Range
- --------------------------------------------------------------------------------
                                          Stocks         Bonds          Cash*
- --------------------------------------------------------------------------------
LifeStrategy Income Fund                  5%-30%        70%-95%         0%-25% 
LifeStrategy Conservative Growth Fund    25%-50%        50%-75%         0%-25% 
LifeStrategy Moderate Growth Fund        45%-70%        30%-55%         0%-25% 
LifeStrategy Growth Fund                 65%-90%        10%-35%         0%-25%
- --------------------------------------------------------------------------------

* "Cash" consists of any cash instruments held by Vanguard Asset Allocation
Fund, one of the underlying Vanguard funds in which the LifeStrategy Funds
invest.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                                 Balanced Funds

Balanced funds are generally "middle-of-the-road" investments that seek to
provide some combination of growth, income, and conservation of capital by
investing in a mix of stocks, bonds, and/or money market instruments. Because
the prices of stocks and bonds often move in different directions, balanced
funds are able to use rewards from one type of investment to help offset the
risks from another.
- --------------------------------------------------------------------------------
<PAGE>
 
14

Primary Investment Strategies 
    
This section explains how the Funds pursue their individual objectives by
investing in different combinations of Vanguard funds that hold stocks, bonds,
and cash instruments. In addition, this section discusses several important
risks faced by investors in some or all of the Funds. The Funds' Board of
Trustees oversees the management of the Funds, and may change the investment
strategies in the interest of shareholders.
     
Market Exposure

Stocks
    
By owning shares of other Vanguard mutual funds, each of the LifeStrategy Funds
indirectly invests, to varying degrees, in U.S. common stocks, with emphasis on
large-cap stocks, and to a lesser extent in foreign stocks (except that
LifeStrategy Income Fund will not invest in foreign stocks).
     
[GRAPHIC APPEARS HERE] The Funds are subject to stock market risk, which is the
                       possibility that stock prices overall will decline over
                       short or even long periods. Stock markets tend to move in
                       cycles, with periods of rising prices and periods of
                       falling prices.

To illustrate the volatility of stock prices, the following table shows the
best, worst, and average total returns for the U.S. stock market over various
periods as measured by the Standard & Poor's 500 Composite Stock Price Index, a
widely used barometer of stock market activity. (Total returns consist of
dividend income plus change in market price.) Note that the returns shown do not
include the costs of buying and selling stocks or other expenses that a
real-world investment portfolio would incur. Note, also, that the gap between
best and worst tends to narrow over the long term.
    
- --------------------------------------------------------------------------------
                     U.S. Stock Market Returns (1926-1998)
- --------------------------------------------------------------------------------
                     1 Year         5 Years        10 Years       20 Years
- --------------------------------------------------------------------------------
Best                  54.2%          24.1%          19.9%          17.7%
Worst                -43.1          -12.4           -0.8            3.1
Average               13.1           10.7           11.0           11.0
- --------------------------------------------------------------------------------
     
     The table covers all of the 1-, 5-, 10-, and 20-year periods from 1926
through 1998. You can see, for example, that while the average return on stocks
for all of the 5-year periods was 10.7%, returns for individual 5-year periods
ranged from a -12.4% average (from 1928 through 1932) to 24.1% (from 1994
through 1998). These average returns reflect past performance on common stocks;
you should not regard them as an indication of future returns from either the
stock market as a whole or these Funds in particular. 
    
     Through their investments in one underlying fund (the Asset Allocation
Fund), the Funds will hold a diversified combination of common stocks intended
to parallel the performance of the S&P 500 Index, which is dominated by large-
cap U.S. common stocks. Through another underlying fund (the Total Stock Market
Index Fund), each Fund will hold a representative sample of the securities in
the Wilshire 5000 Equity Index--a benchmark for the entire U.S. stock market.

     Keep in mind, that a significant portion of the market value of the
Wilshire 5000 Index (about 22% as of December 31, 1998) is compromised of
securities not included in the S&P 500 Index. These securities are
overwhelmingly mid- and small-cap stocks, which historically have been more
volatile than--and at times have performed quite differently from--the stocks of
larger companies.
     
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                    Large-Cap, Mid-Cap, and Small-Cap Stocks

Stocks of publicly traded companies--and mutual funds that hold these stocks--
can be classified by the companies' market value, or capitalization. Generally,
Vanguard defines large-capitalization (large-cap) funds as those holding stocks
of companies whose outstanding shares have a market value exceeding $10 billion.
Mid-cap funds hold stocks of companies with a market value between $1 billion
and $10 billion. Small-cap funds typically hold stocks of companies with a
market value of $1 billion or less.
- --------------------------------------------------------------------------------
<PAGE>
 
                                                                              15
    
     By owning shares of Vanguard Total International Stock Index Fund, which
invests in foreign stocks, the LifeStrategy Conservative Growth, Moderate
Growth, and Growth Funds are subject to country risk and currency risk. Country
risk is the chance that political troubles (such as a war), financial problems
(such as government default), or natural disasters (such as an earthquake) will
weaken a country's economy and cause investments in that country to lose money.
Currency risk is the chance that a stronger U.S. dollar will reduce returns for
Americans investing overseas. Generally, when the dollar rises in value against
a foreign currency, your investment in that country loses value because its
currency is worth fewer U.S. dollars.
     
Bonds 
    
By owning shares of other Vanguard mutual funds, each of the LifeStrategy Funds
indirectly invests, to varying degrees, in government, agency, and corporate
bonds. 
     
[GRAPHIC APPEARS HERE] The Funds are subject to interest rate risk, which is the
                       possibility that bond prices overall will decline over
                       short or even long periods due to rising interest rates.
                       Interest rate risk is modest for shorter-term bonds and
                       higher for longer-term bonds.

     Although bonds are often thought to be less risky than stocks, there have
been periods when bond prices have fallen significantly due to rising interest
rates. For instance, prices of long-term bonds fell by almost 48% between
December 1976 and September 1981.

     To illustrate the relationship between bond prices and interest rates, the
following table shows the impact of a 2% change (both up and down) in interest
rates on three bonds of different maturities, each with a face value of $1,000.

- --------------------------------------------------------------------------------
                 How Interest Rate Changes Affect Bond Prices*
- --------------------------------------------------------------------------------
                          Value of a $1,000 Bond        Value of a $1,000 Bond 
Type of Bond               After a 2% Increase           After a 2% Decrease 
 (Maturity)                in Interest Rates              in Interest Rates 
- --------------------------------------------------------------------------------
Short-Term(2.5 years)             $956                           $1,046
Intermediate-Term(10 years)        870                            1,156 
Long-Term(20 years)                816                            1,251 
- --------------------------------------------------------------------------------
* Assuming a 7% yield. 
- --------------------------------------------------------------------------------

     These figures are intended only to illustrate interest rate risk; they
should not be regarded as an indication of future returns from the bond market
as a whole, or any Fund in particular. 

     Changes in interest rates will affect bond income as well as bond prices.
    
[GRAPHIC APPEARS HERE] The Funds are subject to income risk, which is the
                       possibility that a Fund's dividends (income) will decline
                       due to falling interest rates. Income risk is generally
                       higher for short-term bonds, and lower for long-term
                       bonds.
     
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                            Bonds and Interest Rates

As a rule, when interest rates rise, bond prices fall. The opposite is also
true: Bond prices go up when interest rates fall. Why do bond prices and
interest rates move in opposite directions? Let's assume that you hold a bond
offering a 5% yield. A year later, interest rates are on the rise and bonds are
offered with a 6% yield. With higher-yielding bonds available, you would have
trouble selling your 5% bond for the price you paid--causing you to lower your
asking price. On the other hand, if interest rates were falling and 4% bonds
were being offered, you should be able to sell 5% bond for more than you paid.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                                 Bond Maturities

A bond is issued with a specific maturity--date the date when the bond's issuer,
or seller, must pay back the bond's initial value (known as its "face value").
Bond maturities generally range from less than one year (short-term) to 30
years (long-term). The longer a bond's maturity, the more risk you, as a bond
investor, face as interest rates rise--but also the more interest you could
receive. Long-term bonds are more suitable for investors willing to take greater
risks in hope of higher yields; short-term bond investors should be willing to
accept lower yields in return for less fluctuation in the value of their 
investment.
- --------------------------------------------------------------------------------
<PAGE>
 
16
    
     Income risk is a concern primarily for the Life Strategy Income and
Conservative Growth Funds, which, through their ownership of Vanguard Short-Term
Corporate Fund, indirectly own more short-term bonds.

[GRAPHIC APPEARS HERE] The Funds are subject to prepayment risk, which is the
                       possibility that during periods of falling interest
                       rates, a bond issuer will repay its high-yielding bond
                       earlier than scheduled. Forced to reinvest the
                       unanticipated proceeds at lower rates, the underlying
                       fund would experience a decline in income.

     The risk of prepayment applies primarily to intermediate- and long-term
corporate bonds and mortgage-backed bonds, which comprise a significant portion
of Vanguard Total Bond Market Index Fund. Prepayment risk is a concern primarily
for the LifeStrategy Income Fund, which will invest half its assets in the Total
Bond Market Index Fund.
         
[GRAPHIC APPEARS HERE] The Funds are subject to credit risk, which is the
                       possibility that a bond issuer will fail to pay interest
                       and principal in a timely manner.
      
     The credit quality of the bonds held by the underlying funds is expected to
be very high, and thus credit risk of the LifeStrategy Funds should be low.

     To a limited extent, the Funds are also indirectly exposed to event risk,
which is the possibility that corporate fixed-income securities held by
underlying funds may suffer a substantial decline in credit quality and market
value due to a corporate restructuring.

Cash 

Through one underlying fund (Vanguard Asset Allocation Fund), from 0% to 25% of
the assets of each LifeStrategy Fund can be invested in cash instruments. These
potential cash holdings make the Funds subject to inflation risk, which is the
possibility that the rising cost of living may erode the purchasing power of
your investment over time.
    
     Since the Asset Allocation Fund typically invests only a small portion of
its assets in cash instruments, and the LifeStrategy Funds invest only
one-fourth of their assets in the Asset Allocation Fund, inflation risk to the
Funds is very low. 
     
Security Selection 

Underlying Funds 

Each Fund seeks to achieve its objective by investing in fixed percentages of
four or five underlying Vanguard funds. The following table shows these
percentages for each Fund.

- --------------------------------------------------------------------------------
                                             LifeStrategy Fund
                             ---------------------------------------------------
                                         Conservative     Moderate 
Underlying Vanguard Fund     Income        Growth          Growth       Growth 
- --------------------------------------------------------------------------------
Total Stock Market Index        5%            20%             35%          50% 
Total International Stock 
 Index                         --              5              10           15 
Total Bond Market Index        50             30              30           10 
Short-Term Corporate           20             20               -            -
Asset Allocation               25             25              25           25 
- --------------------------------------------------------------------------------
Total                         100%           100%            100%         100% 
- --------------------------------------------------------------------------------
    
     The allocation of each Fund's assets among the underlying funds is made by
the LifeStrategy Funds' Board of Trustees based on the Fund's investment
objective and policies, and may be changed from time to time without shareholder
approval. The Funds' investments in the underlying funds may be limited at times
by certain factors. For example, the Board of Trustees of an underlying fund may
impose limits on additional investments in the fund.
     
<PAGE>
 
     The following briefly describes the five underlying Vanguard funds in which
     the Funds invest.
    
 .    Vanguard Total Stock Market Index Fund seeks to provide investment results
     that parallel the performance of the unmanaged Wilshire 5000 Index, which
     consists of all U.S. common stocks traded on the New York and American
     Stock Exchanges and the NASDAQ Over-the-Counter Market.

 .    Vanguard Total International Stock Index Fund seeks to provide investment
     results that parallel the performance of the Morgan Stanley Capital
     International (MSCI) Europe, Australasia, Far East Index plus the MSCI
     Select Emerging Markets Free Index. The fund has exposure to stocks in more
     than 35 foreign countries. Note: Purchases of the Total International Stock
     Index Fund by the LifeStrategy Funds (other than purchases with reinvested
     dividends or capital gains) are subject to a transaction fee of 0.50%. This
     fee is not a sales load; it is retained by the Total International Stock
     Index Fund to offset the high costs of trading international securities.
     The transaction fee ensures that these higher costs are borne by the
     investors making the transactions and not by the shareholders already in
     the fund.     

 .    Vanguard Total Bond Market Index Fund seeks to provide investment results
     that parallel the performance of the Lehman Brothers Aggregate Bond Index.
     The fund is designed to provide investors with a low-cost method of
     consistently capturing the return of the U.S. bond market, as defined by
     its benchmark index.

 .    Vanguard Short-Term Corporate Fund invests in a diversified portfolio of
     investment-grade corporate bonds with an expected average maturity of two
     to three years.

 .    Vanguard Asset Allocation Fund invests in a mix of common stocks (selected
     to parallel the performance of the S&P 500 Index), long-term U.S. Treasury
     bonds, and cash equivalents. The allocations are designed to take advantage
     of perceived imbalances in the relative returns and risks of each asset
     class. At any given time, the adviser may allocate all, a portion, or none
     of the fund's assets to stocks, bonds, or cash reserves.

[GRAPHIC APPEARS HERE] Through their investments in Vanguard Asset Allocation
                       Fund, the LifeStrategy Funds are subject to manager risk,
                       which is the possibility that the fund's adviser could do
                       a poor job of deciding on allocations to each asset
                       class.
         
Temporary Defensive Measures 
    
The Funds' underlying funds may, from time to time, take temporary defensive
measures--such as holding cash reserves without limit--that are inconsistent
with the funds' primary investment strategies, in response to adverse market,
economic, political, or other conditions. If one or more of the underlying funds
take temporary defensive measures, the Life Strategy Funds may not achieve their
investment objective.
     
Costs and Market-Timing 

Some investors try to profit from market-timing--switching money into
investments when they expect prices to rise, and taking money out when they
expect the market to fall. As money is shifted in and out, a fund incurs
expenses for buying and selling securities. These costs are borne by all fund
shareholders, including the long-term investors who do not generate the costs.
Therefore, the Funds have adopted the following policies, among others, designed
to discourage short-term trading:
    
 .   Each Fund reserves the right to reject any purchase request--including
    exchanges from other Vanguard funds--that it regards as disruptive to the
    efficient management of the Fund or the underlying funds. A purchase request
    could be rejected because of the timing of the request or because of a
    history of excessive trading by the investor.
     
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                             The Costs of Investing

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with the buying and selling of securities by the fund. These
costs can erode a substantial portion of the gross income or capital
appreciation a fund achieves. Even seemingly small differences in expenses can,
over time, have a dramatic effect on a fund's performance.
- --------------------------------------------------------------------------------
<PAGE>
 
18

 .    There is a limit on the number of times you can exchange into and out of
     each Fund (see "Exchanges" in the Investing with Vanguard section).

 .    Each Fund reserves the right to stop offering shares at any time. 

     The Vanguard funds do not permit market-timing. Do not invest in these
Funds if you are a market-timer.

The Funds and Vanguard
    
The LifeStrategy Funds have entered into an Agreement with Vanguard under which
Vanguard provides all management, administrative, and distribution services to
the Funds at cost. The Funds owe Vanguard a sum sufficient to cover Vanguard's
out-of-pocket costs. The Funds also bear the expenses of services provided by
other parties (such as auditors, legal counsel, and the Fund's custodian), as
well as taxes and other direct expenses of the Fund. However, the Agreement
provides that the Funds' expenses will be offset by a reimbursement from
Vanguard for (a) contributions made by the Funds to the cost of operating the
underlying Vanguard funds in which the LifeStrategy Funds invest, and (b)
certain savings in administrative and marketing costs that Vanguard is expected
to derive from the operation of the Funds. 
     
     The Funds' Trustees believe that the reimbursements should be sufficient to
offset most, if not all, of the expenses incurred by the Funds. Therefore, the
Funds are expected to operate at a very low or zero expense ratio. Since their
inception in 1994, the Funds in fact have had no direct net expenses.

     Of course, shareholders of the LifeStrategy Funds will still bear,
indirectly, their proportionate share of the costs of operating the underlying
Vanguard funds. During their most recent fiscal years, the underlying funds had
the following expense ratios:
    
 .    Total Stock Market Index                   0.20%
 .    Total International Stock Index            0.34%
 .    Total Bond Market Index                    0.20%
 .    Short-Term Corporate                       0.27%
 .    Asset Allocation                           0.49%
     
     Based on the percentage of each underlying fund owned, the LifeStrategy
Funds had the following indirect expense ratios as of December 31, 1998:
    
- ---------------------------------------------------------
Fund                               Indirect Expense Ratio 
- ---------------------------------------------------------
LifeStrategy Income                          0.29% 
LifeStrategy Conservative Growth             0.29% 
LifeStrategy Moderate Growth                 0.29% 
LifeStrategy Growth                          0.29%
     
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT

                      Vanguard's Unique Corporate Structure

The Vanguard Group is truly a mutual  fund company. It is owned jointly by
the funds it oversees and thus indirectly by the shareholders in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person, by a group of individuals, or by investors who own the
management company's stock. By contrast, Vanguard provides its services on an
"at-cost" basis, and the funds' expense ratios reflect only these costs. No
separate management company reaps profits or absorbs losses from operating the
funds.
- --------------------------------------------------------------------------------
<PAGE>
 
                                                                              19

Investment Adviser

The Life Strategy Funds do not employ an investment adviser, but they benefit
from the investment advisory services rendered to the underlying funds. The
underlying funds are managed by the following investment advisory firms:

  ------------------------------------------------------------------------------
  Underlying Fund                                Investment Advisory Firm
  ------------------------------------------------------------------------------
  Vanguard Total Stock Market Index Fund         Vanguard Core Management Group
  ------------------------------------------------------------------------------
  Vanguard Total International Stock Index Fund  Vanguard Core Management Group*
  ------------------------------------------------------------------------------
  Vanguard Total Bond Market Index Fund          Vanguard Fixed Income Group 
  ------------------------------------------------------------------------------
  Vanguard Short-Term Corporate Fund             Vanguard Fixed Income Group 
  ------------------------------------------------------------------------------
  Vanguard Asset Allocation Fund                 Mellon Capital Management 
                                                 Corporation
  ------------------------------------------------------------------------------
  * Vanguard Total International Stock Index Fund does not have its own
    investment adviser, but rather benefits from the advisory services provided
    by the Core Management Group to the three underlying funds in which the
    Total International Stock Index Fund invests: Vanguard European Stock Index
    Fund, Vanguard Pacific Stock Index Fund, and Vanguard Emerging Markets Stock
    Index Fund. The Core Management Group also manages the Total International
    Stock Index Fund's cash assets, if any.
  ------------------------------------------------------------------------------

The chart below briefly describes each investment advisory firm:
    
 -------------------------------------------------------------------------------
 Firm                                        Background
 -------------------------------------------------------------------------------
 Mellon Capital Management Corporation       Based in San Francisco, California
                                             Founded in 1983
                                             Manages more than $73 billion in 
                                             assets
 -------------------------------------------------------------------------------
 Vanguard Core Management Group              Based in Valley Forge, Pennsylvania
                                             Founded in 1974
                                             Manages more than $147 billion in 
                                             assets
 -------------------------------------------------------------------------------
 Vanguard Fixed Income Group                 Based in Valley Forge, Pennsylvania
                                             Founded in 1974
                                             Manages more than $127 billion in 
                                             assets
 -------------------------------------------------------------------------------
         
     The Board of Trustees of an underlying fund may without prior approval from
shareholders of the underlying fund or the LifeStrategy Funds, change the terms
of any advisory agreement or hire a new investment adviser, either as a
replacement for an adviser or as an additional adviser.
     
Year 2000 Challenge

The common practice in computer programming of using just two digits to identify
a year has resulted in the Year 2000 challenge throughout the information
technology industry. If unchanged, many computer applications and systems could
misinterpret dates occurring after December 31, 1999, leading to errors or
failure. Such failure could adversely affect a fund's operations, including
pricing, securities trading, and the servicing of shareholder accounts. 

     The Vanguard Group is dedicated to providing uninterrupted, high-quality
performance from our computer systems before, during, and after 2000. In July
1998, we completed the renovation and initial testing of our internal systems.
Vanguard is diligently working with external partners, suppliers, and vendors,
including fund managers and other service providers, to assure that the systems
with which we interact remain operational at all times. 
<PAGE>
 
20

     In addition to taking every reasonable step to secure our internal systems
and external relationships, Vanguard is further developing contingency plans
intended to assure that unexpected systems failures will not adversely affect
the Funds' operations. Vanguard intends to monitor these processes through the
rollover of 1999 into 2000 and to quickly implement alternate solutions if
necessary.

     However, despite Vanguard's efforts and contingency plans, noncompliant
computer systems could have a material adverse effect on the Funds' business,
operations, or financial condition. Additionally, the Funds' performance could
be hurt if a computer-system failure at a company or governmental unit affects
the price of securities the Funds' underlying funds own. 

Dividends, Capital Gains, and Taxes 
    
Each of the LifeStrategy Funds distributes to shareholders virtually all of its
net income (interest and dividends paid by the underlying funds) as well as any
capital gains realized from the sale of its holdings or received as capital
gains distributions from the underlying funds. The Income and Conservative
Growth Funds distribute their net income in March, June, September, and
December, while the Moderate Growth and Growth Funds pay such distributions each
June and December. Capital gains distributions generally occur in December. In
addition, the Funds may occasionally be required to make supplemental dividend
or capital gains distributions at some other time during the year.
     
     Dividend and capital gains distributions of Fund shares that are held as an
investment option in an employer-sponsored retirement or savings plan will be
reinvested in additional Fund shares and accumulate on a tax-deferred basis. You
will not owe taxes on these distributions until you begin withdrawals. You
should consult your plan administrator, your plan's Summary Plan Description, or
your tax adviser about the tax consequences of an investment in any of the Funds
and of any plan withdrawals. 


Share Price 
    
Each Fund's share price, called its net asset value, or NAV, is calculated each
business day after the close of trading on the New York Stock Exchange (the NAV
is not calculated on holidays or other days the Exchange is closed). Net asset
value per share is computed by adding up the total value of the Fund's
investments (i.e., shares of the underlying Vanguard funds) and other assets,
subtracting any of its liabilities (debts), and then dividing by the number of
Fund shares outstanding: 
     
                                   Total Assets - Liabilities 
             Net Asset Value = ------------------------------------
                                   Number of Shares Outstanding 

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the number of shares you own, gives you the dollar amount you would have
received had you sold all of your shares back to the Fund that day.
         
     The Funds' share prices can be found daily in the mutual fund listings of
most major newspapers under the heading "Vanguard Funds." Different newspapers
use different abbreviations of the Funds' names, but the most common are:
LifeInc, LifeCon, LifeMod, and LifeGro.
<PAGE>
 
                                                                              21

Financial Highlights

The following financial highlights tables are intended to help you understand
each Fund's financial performance since inception, and certain information
reflects financial results for a single Fund share. The total returns in the
table represent the rate that an investor would have earned or lost each period
on an investment in each Fund (assuming reinvestment of all dividends and
distributions). This information has been derived from the financial statements
audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along with the Funds' financial statement--is included in the Funds' 
most recent annual report to shareholders. You may have the annual report sent
to you without charge by contacting Vanguard.

- --------------------------------------------------------------------------------
    
                                PLAIN TALK ABOUT

                   How to Read the Financial Highlights Tables

This explanation uses the LifeStrategy Income Fund as an example. The Fund began
fiscal 1998 with a net asset value (price) of $12.43 per share. During the year,
the Fund earned $.63 per share from investment income, $.20 per share in capital
gains distributions, and $.78 per share from investments that had appreciated in
value or that were sold for higher prices than the Fund paid for them.

     Shareholders received $.82 per share in the form of dividend and capital
gains distributions. A portion of each year's distributions may come from the
prior year's income or capital gains.

     The earnings ($1.61 per share) minus the distributions ($.82 per share)
resulted in a share price of $13.22 at the end of the year. This was an increase
of $.79 per share (from $12.43 at the beginning of the year to $13.22 at the end
of the year). For a shareholder who reinvested the distributions in the purchase
of more shares, the total return from the Fund was 13.17% for the year.

     As of December 31, 1998, the Fund had $449 million in net assets. For the
year, its net investment income amounted to 5.24% of its average net assets; and
it sold and replaced securities valued at 3% of its net assets.
     
<TABLE>     
<CAPTION>
- ---------------------------------------------------------------------------------------------------
                                                        Vanguard LifeStrategy Income Fund
                                                  Year Ended December 31,                 
                                         ----------------------------------------     Sep. 30* to
                                           1998      1997      1996       1995       Dec. 31, 1994 
- ---------------------------------------------------------------------------------------------------
<S>                                      <C>       <C>       <C>        <C>          <C> 
Net Asset Value, Beginning of Period     $12.43    $11.55    $11.54     $ 9.88           $10.00 
- ---------------------------------------------------------------------------------------------------
Investment Operations 
   Net Investment Income                    .63       .63       .64        .49              .14 
   Capital Gains Distributions Received     .20       .15       .19        .09               --
   Net Realized and Unrealized 
     Gain (Loss) on Investments             .78       .83       .03       1.66             (.12) 
                                         ----------------------------------------------------------
     Total from Investment Operations      1.61      1.61       .86       2.24              .02 
                                         ----------------------------------------------------------
Distributions 
   Dividends from Net 
     Investment Income                     (.63)     (.63)     (.64)      (.49)            (.14) 
   Distributions from Realized 
     Capital Gains                         (.19)     (.10)     (.21)      (.09)              --
                                         ----------------------------------------------------------
     Total Distributions                   (.82)     (.73)     (.85)      (.58)            (.14) 
- ---------------------------------------------------------------------------------------------------
Net Asset Value, End of Period           $13.22    $12.43    $11.55     $11.54           $ 9.88
===================================================================================================

Total Return                              13.17%    14.23%     7.65%     22.99%            0.20% 
===================================================================================================

Ratios/Supplemental Data 
   Net Assets, End of Period (Millions)    $449      $244      $151       $121              $11 
   Ratio of Expenses to
     Average Net Assets                       0%        0%        0%         0%               0% 
   Ratio of Net Investment Income to 
     Average Net Assets                    5.24%     5.54%     5.66%      5.76%            7.31%** 
   Turnover Rate                              3%        6%       22%         4%               1% 
===================================================================================================
</TABLE>      
 * Inception date. 
** Annualized. 

     From time to time, the Vanguard funds advertise yield and total return
figures. Yield is a measure of past dividend income. Total return includes both
past dividend income (assuming that it has been reinvested) plus realized and
unrealized capital appreciation (or depreciation). Neither yield nor total
return should be used to predict the future performance of a fund.
<PAGE>
 
22

<TABLE>     
<CAPTION> 
- ---------------------------------------------------------------------------------------------------------------------
                                                                Vanguard LifeStrategy Conservative Growth Fund   
                                                                   Year Ended December 31,               
                                                        -----------------------------------------        Sep. 30* to
                                                          1998        1997      1996         1995       Dec. 31, 1994
- ---------------------------------------------------------------------------------------------------------------------
<S>                                                    <C>         <C>       <C>          <C>          <C> 
Net Asset Value, Beginning of Period                    $13.40      $12.14    $11.68       $ 9.89              $10.03
- ---------------------------------------------------------------------------------------------------------------------
Investment Operations               
  Net Investment Income                                    .58         .56       .53          .47                 .14 
  Capital Gains Distributions Received                     .20         .18       .20          .11                 .01
  Net Realized and Unrealized Gain  
   (Loss) on Investments                                  1.32        1.27       .46         1.80                (.14)
                                                        -------------------------------------------------------------
      Total from Investment Operations                    2.10        2.01      1.19         2.38                 .01 
                                                        -------------------------------------------------------------
Distributions 
  Dividends from Net Investment Income                    (.59)       (.56)     (.53)        (.47)               (.14) 
  Distributions from Realized Capital Gains               (.20)       (.19)     (.20)        (.12)               (.01) 
                                                        -------------------------------------------------------------
      Total Distributions                                 (.79)       (.75)     (.73)        (.59)               (.15) 
- ---------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                          $14.71      $13.40    $12.14       $11.68              $ 9.89 
=====================================================================================================================
                                    
Total Return                                             15.88%      16.81%    10.36%       24.35%               0.10% 
=====================================================================================================================
                                    
Ratios/Supplemental Data 
  Net Assets, End of Period (Millions)                  $1,416        $803      $462         $219               $41 
  Ratio of Expenses to Average Net Assets                    0%          0%        0%           0%                0% 
  Ratio of Net Investment Income to Average Net Assets    4.32%       4.61%     4.86%        5.14%             7.07%** 
  Turnover Rate                                              3%          1%        2%           1%                0%
=====================================================================================================================
</TABLE>      
 * Inception date. 
** Annualized.

<TABLE>     
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------
                                                                   Vanguard LifeStrategy Moderate Growth Fund
                                                                    Year Ended December 31,                    
                                                          -----------------------------------------        Sep. 30* to
                                                            1998         1997      1996        1995       Dec. 31, 1994
- ------------------------------------------------------------------------------------------------------------------------
<S>                                                      <C>          <C>       <C>         <C>          <C> 
Net Asset Value, Beginning of Period                      $14.81       $12.97    $12.11      $ 9.86              $10.08
- ------------------------------------------------------------------------------------------------------------------------
Investment Operations                            
  Net Investment Income                                     .510         .490       .44         .36                 .14 
  Capital Gains Distributions Received                      .241         .236       .22         .13                 .01
  Net Realized and Unrealized Gain                 
   (Loss) on Investments                                   2.054        1.819       .87        2.25                (.22) 
                                                          --------------------------------------------------------------
     Total from Investment Operations                      2.805        2.545      1.53        2.74                (.07) 
                                                          --------------------------------------------------------------
Distributions 
  Dividends from Net Investment Income                     (.510)       (.490)     (.44)       (.36)               (.14)
  Distributions from Realized Capital Gains                (.245)       (.215)     (.23)       (.13)               (.01) 
                                                          --------------------------------------------------------------
     Total Distributions                                   (.755)       (.705)     (.67)       (.49)               (.15) 
- ------------------------------------------------------------------------------------------------------------------------
Net Asset Value, End of Period                            $16.86       $14.81    $12.97      $12.11              $ 9.86 
========================================================================================================================
                                                 
Total Return                                               19.03%       19.77%    12.71%      27.94%              -0.70% 
========================================================================================================================
                                                 
Ratios/Supplemental Data 
  Net Assets, End of Period (Millions)                    $2,202       $1,358      $826        $235                 $35 
  Ratio of Expenses to Average Net Assets                      0%           0%        0%          0%                  0%
  Ratio of Net Investment Income to Average Net Assets      3.43%        3.72%     3.98%       4.42%               7.10%** 
  Turnover Rate                                                5%           2%        3%          1%                  0% 
========================================================================================================================
</TABLE> 
 * Inception date. 
** Annualized.      
<PAGE>
 
                                                                              23
<TABLE>     
<CAPTION> 

- -----------------------------------------------------------------------------------------------------
                                                         Vanguard LifeStrategy Growth Fund
                                                  Year Ended December 31,                
                                        ------------------------------------------       Sep. 30* to
                                          1998        1997       1996        1995       Dec. 31, 1994
- -----------------------------------------------------------------------------------------------------
<S>                                     <C>          <C>       <C>         <C>          <C>   
Net Asset Value, Beginning of Period    $16.04       $13.68    $12.36      $ 9.93             $10.10
- -----------------------------------------------------------------------------------------------------
Investment Operations               
  Net Investment Income                   .410          .39       .34         .32                .13 
  Capital Gains Distributions Received    .264          .28       .24         .14                .02
  Net Realized and Unrealized Gain 
   (Loss) on Investments                 2.751         2.36      1.32        2.43               (.16) 
                                      --------------------------------------------------------------- 
     Total from Investment Operations    3.425         3.03      1.90        2.89               (.01) 
                                      --------------------------------------------------------------- 
Distributions 
  Dividends from Net Investment Income   (.410)        (.38)     (.35)       (.31)              (.14)
  Distributions from Realized 
   Capital Gains                         (.265)        (.29)     (.23)       (.15)              (.02) 
                                      --------------------------------------------------------------- 
     Total Distributions                 (.675)        (.67)     (.58)       (.46)              (.16) 
- -----------------------------------------------------------------------------------------------------
Net Asset Value, End of Period          $18.79        $16.04   $13.68      $12.36             $ 9.93 
=====================================================================================================

Total Return                             21.40%        22.26%   15.41%      29.24%             -0.10% 
=====================================================================================================
                                    
Ratios/Supplemental Data 
  Net Assets, End of Period 
  (Millions)                            $1,924        $1,184     $629        $217                $38 
  Ratio of Expenses to Average      
   Net Assets                                0%            0%       0%          0%                 0%
  Ratio of Net Investment           
   Income to Average Net Assets           2.53%         2.84%    3.18%       3.67%              7.06%** 
  Turnover Rate                              2%            1%       0%          1%                 1% 
=====================================================================================================
</TABLE>      
 * Inception date. 
** Annualized.

"Standard & Poor's(R)," "S&P(R)," "S&P 500(R)," "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc. 
<PAGE>
 
24

Investing with Vanguard

One or more of the Funds may be an investment option in your retirement or
savings plan. Your plan administrator or your employee benefits office can
provide you with detailed information on how to participate in your plan and how
to elect the Funds as an investment option.

 .  If you have any questions about a Fund or Vanguard, including a Fund's
   investment objectives, strategies, or risks, contact Vanguard's Participant
   Services Center, toll-free, at 1-800-523-1188.

 .  If you have questions about your account, contact your plan administrator
   or the organization that provides recordkeeping services for your plan.

Investment Options and Allocations 

Your plan's specific provisions may allow you to change your investment
selections, the amount of your contributions, or how your contributions are
allocated among the investment choices available to you. Contact your plan
administrator or employee benefits office for more details. 

Transactions

Contributions, exchanges, or redemptions of the Funds' shares are processed as
soon as they have been received by Vanguard in good order. Good order means that
your request includes complete information on your contribution, exchange, or
redemption, and that Vanguard has received the appropriate assets. 
    
     In all cases, your transaction will be based on the Fund's next-determined
net asset value after Vanguard receives your request (or, in the case of new
contributions, the next-determined net asset value after Vanguard receives the
order from your plan administrator). As long as this request is received before
the close of trading on the New York Stock Exchange, generally 4 p.m. Eastern
time, you will receive that day's net asset value. 
     
Exchanges 

The exchange privilege (your ability to redeem shares from one fund to purchase
shares of another fund) may be available to you through your plan. Although we
make every effort to maintain the exchange privilege, Vanguard reserves the
right to revise or terminate this privilege, limit the amount of an exchange or
reject any exchange, at any time, without notice. Because excessive exchanges
can potentially disrupt the management of a Fund and increase its transaction
costs, Vanguard limits participant exchange activity to no more than four
substantive "round trips" through each of the Funds (at least 90 days apart)
during any 12-month period. A "round trip" is a redemption from one of the Funds
followed by a purchase back into the same Fund. "Substantive" means a dollar
amount that Vanguard determines, in its sole discretion, could adversely affect
the management of that Fund. 

   Before making an exchange to or from another fund available in your plan,
   consider the following:

 .  Certain investment options, particularly funds made up of company stock or
   investment contracts, may be subject to unique restrictions.

 .  Make sure to read that fund's prospectus. Contact Participant Services,
   toll-free, at 1-800-523-1188 for a copy.

 .  Vanguard can accept exchanges only as permitted by your plan. Contact your
   plan administrator for details on the exchange policies that apply to your
   plan.

Accessing Fund Information by Computer 

- --------------------------------------------------------------------------------
Vanguard on the World Wide Web www.vanguard.com 

Use your personal computer to visit Vanguard's education-oriented website, which
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.
- --------------------------------------------------------------------------------
<PAGE>
 
Glossary of Investment Terms

Active Management

An investment approach that seeks to exceed the average returns of the financial
markets. Active managers rely on research, market forecasts, and their own
judgment and experience in selecting securities to buy and sell.

Balanced Fund

A mutual fund that seeks to provide some combination of income, capital growth,
and conservation of capital by investing in stocks, bonds, and/or money market
instruments. 

Bond 

A debt security (IOU) issued by a corporation, government, or government agency
in exchange for the money you lend it. In most instances, the issuer agrees to
pay back the loan by a specific date and to make regular interest payments until
that date. 

Capital Gains Distribution 

Payment to mutual fund shareholders of gains realized on securities that the
fund has sold at a profit, minus any realized losses. 

Cash Reserves 

Cash deposits as well as short-term bank deposits and money market instruments
which include U.S. Treasury bills, bank certificates of deposit (CDs),
repurchase agreements, commercial paper, and banker's acceptances. 

Common Stock

A security representing ownership rights in a corporation. A stockholder is
entitled to share in the company's profits, some of which may be paid out as
dividends. 

Dividend Income 

Payment to shareholders of income from interest or dividends generated by a
fund's investments. 

Expense Ratio 

The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any
12b-1 distribution fees. 

Fund of Funds 

A mutual fund that pursues its objective by investing in other mutual funds
rather than in individual securities.

Investment Adviser

An organization that makes the day-to-day decisions regarding a fund's
investments.

Mutual Fund

An investment company that pools the money of many people and invests it in a
variety of securities in an effort to achieve a specific objective over time.

Net Asset Value (NAV)

The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price.

Passive Management

A low-cost investment strategy in which a mutual fund attempts to match--rather
than outperform--a particular stock or bond market index. Also known as
indexing. 

Price/Earnings (P/E) Ratio 

The current share price of a stock, divided by its per-share earnings (profits)
from the past year. A stock selling for $20, with earnings of $2 per share, has
a price/earnings ratio of 10.

Total Return

A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

Volatility

The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

Yield

Income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price.
<PAGE>
 
                              [LETTERHEAD OF THE VANGUARD GROUP(R) APPEARS HERE]


For More Information

If you'd like more information about Vanguard LifeStrategy Funds, the following
documents are available free upon request: 

Annual/Semiannual Report to Shareholders 

Additional information about the Funds' investments is available in the Funds'
annual and semiannual reports to shareholders. In these reports, you will find a
discussion of the market conditions and investment strategies that significantly
affected the Funds' performance during the most recent fiscal year. 

Statement of Additional Information (SAI) 

The SAI provides more detailed information about the Funds. 

The current annual and semiannual reports and the SAI are incorporated by
reference into (and are thus legally a part of) this prospectus.

To receive a free copy of the latest annual or semiannual report or the SAI, or
to request additional information about the Funds or other Vanguard funds,
please contact us as follows:

The Vanguard Group
Participant Services Center
P.O. Box 2900
Valley Forge, PA 19482-2900

Telephone: 1-800-523-1188

Text Telephone: 1-800-523-8004

World Wide Web: www.vanguard.com

Information provided by the Securities and Exchange Commission (SEC)

You can review and copy information about the Funds (including the SAI) at the
SEC's Public Reference Room in Washington, D.C. To find out more about this
public service, call the SEC at 1-800-SEC-0330. Reports and other information
about the Funds are also available on the SEC's website (www.sec.gov), or you
can receive copies of this information, for a fee, by writing the Public
Reference Section, Securities and Exchange Commission, Washington, DC
20549-6009. 

Funds' Investment Company Act file number: 811-3919 



                                               (C) 1999 The Vanguard Group, Inc.
                                               All rights reserved.
                                               Vanguard Marketing Corporation,
                                               Distributor.

                                               1088N-04/30/1999
<PAGE>
 
                                    PART B
 
                              VANGUARD STAR FUNDS
                                  
                               (the Trust)     
 
                      STATEMENT OF ADDITIONAL INFORMATION
                                April 30, 1999
   
  This Statement is not a prospectus but should be read in conjunction with
the Trust's current Prospectuses (dated April 30, 1999). To obtain the Pro-
spectuses or an additional 1998 Annual Report to Shareholders, which contains
the Funds' Financial Statements as hereby incorporated by reference, please
call the Investor Information Department:     
 
                                1-800-662-7447
                                    (SHIP)
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Description of the Trust...................................................  B-1
Fundamental Investment Limitations.........................................  B-3
Investment Policies........................................................  B-4
Management of the Trust.................................................... B-10
Investment Advisory Services............................................... B-12
Portfolio Transactions..................................................... B-23
Purchase of Shares......................................................... B-24
Redemption of Shares....................................................... B-24
Share Price................................................................ B-25
Yield and Total Return..................................................... B-25
Comparative Indexes........................................................ B-26
Financial Statements....................................................... B-29
</TABLE>    
 
                           DESCRIPTION OF THE TRUST
 
Organization
   
  The Trust was organized as a Pennsylvania business trust in 1983, and was
reorganized as a Delaware business trust in June 1998. The Trust is registered
with the United States Securities and Exchange Commission (the Commission) un-
der the Investment Company Act of 1940 (the 1940 Act) as an open-end diversi-
fied management investment company. It currently offers the following funds:
    
  Vanguard STAR Fund
  Vanguard LifeStrategy Income Fund
  Vanguard LifeStrategy Growth Fund
  Vanguard LifeStrategy Conservative Growth Fund
  Vanguard LifeStrategy Moderate Growth Fund
  Vanguard Total International Stock Index Fund 
   
  (individually, a Fund; collectively, the Funds)     
 
  The Trust has the ability to offer additional funds or classes of shares.
There is no limit on the number of full and fractional shares that the Trust
may issue for a single fund or class of shares.
 
                                                                            B-1
<PAGE>
 
Service Providers
 
  Custodian. First Union National Bank, PA4943, 530 Walnut Street, Philadel-
phia, Pennsylvania 19106 and The Chase Manhattan Bank, N.A., 4 Chase MetroTech
Center, Brooklyn, New York 11245, serve as the Funds' custodians. The custodi-
ans are responsible for maintaining the Funds' assets and keeping all neces-
sary accounts and records.
 
  Independent Accountants. PricewaterhouseCoopers LLP, 30 South 17th Street,
Philadelphia, Pennsylvania 19103, serves as the Funds' independent accoun-
tants. The accountants audit the Funds' financial statements and provide other
related services.
 
  Transfer and Dividend-Paying Agent. The Funds' transfer and dividend-paying
agent is The Vanguard Group, Inc., 100 Vanguard Boulevard, Malvern, Pennsylva-
nia 19355.
 
Characteristics of the Trust's Shares
 
  Restrictions on Holding or Disposing of Shares. There are no restrictions on
the right of shareholders to retain or dispose of the Trust's shares, other
than the possible future termination of the Trust or any of its Funds. The
Trust or any of its Funds may be terminated by reorganization into another mu-
tual fund or by liquidation and distribution of the assets of the affected
Fund. Unless terminated by reorganization or liquidation, the Trust and its
funds will continue indefinitely.
 
  Shareholder Liability. The Trust is organized under Delaware law, which pro-
vides that shareholders of a business trust are entitled to the same limita-
tions of personal liability as shareholders of a corporation organized under
Delaware law. Effectively, this means that a shareholder of the Trust will not
be personally liable for payment of the Trust's debts except by reason of his
or her own conduct or acts. In addition, a shareholder could incur a financial
loss on account of a Trust obligation only if the Trust itself had no remain-
ing assets with which to meet such obligation. We believe that the possibility
of such a situation arising is extremely remote.
 
  Dividend Rights. The shareholders of a Fund are entitled to receive any div-
idends or other distributions declared for such Fund. No shares have priority
or preference over any other shares of the same Fund with respect to distribu-
tions. Distributions will be made from the assets of a Fund, and will be paid
ratably to all shareholders of the Fund (or class) according to the number of
shares of such Fund (or class) held by shareholders on the record date. The
amount of income dividends per share may vary between separate share classes
of the same Fund based upon differences in the way that expenses are allocated
between share classes pursuant to a multiple class plan.
 
  Voting Rights. Shareholders are entitled to vote on a matter if: (i) a
shareholder vote is required under the 1940 Act; (ii) the matter concerns an
amendment of the Declaration of Trust that would adversely affect to a mate-
rial degree the rights and preferences of the shares of any Fund; or (iii) the
Trustees determine that it is necessary or desirable to obtain a shareholder
vote. The 1940 Act requires a shareholder vote under various circumstances,
including to elect or remove Trustees upon written request of shareholders
representing 10% or more of the Trust's net assets, and to change any funda-
mental policy of the Trust. Shareholders of the Trust receive one vote for
each dollar of net asset value owned on the record date, and a fractional vote
for each fractional dollar of net assets owned on the record date. However,
only the shares of a Fund affected by a particular matter are entitled to vote
on that matter. Voting rights are non-cumulative and cannot be modified with-
out a majority vote.
 
  Liquidation Rights. In the event a Fund liquidates, shareholders of the Fund
will be entitled to receive a pro rata share of the Funds' net assets.
 
  Preemptive Rights. There are no preemptive rights associated with shares of
the Funds.
 
B-2
<PAGE>
 
  Conversion Rights. There are no conversion rights associated with shares of
the Funds.
 
  Redemption Provisions. Each Fund's redemption provisions are described in
its current prospectus and elsewhere in this Statement of Additional Informa-
tion.
 
  Sinking Fund Provisions. The Trust has no sinking fund provisions.
 
  Calls or Assessments. Each Fund's shares, when issued, are fully paid and
non-assessable.
 
Tax Status of the Trust
 
  Each Fund of the Trust intends to qualify as a "regulated investment compa-
ny" under Subchapter M of the Internal Revenue Code. This special tax status
means that a Fund will not be liable for federal tax on income and capital
gains distributed to shareholders. In order to preserve its tax status, each
Fund must comply with certain requirements. If a Fund fails to meet these re-
quirements in any taxable year, it will be subject to tax on its taxable in-
come at corporate rates, and all distributions from earnings and profits, in-
cluding any distributions of net tax-exempt income and net long-term capital
gains, will be taxable to shareholders as ordinary income. In addition, the
Fund could be required to recognize unrealized gains, pay substantial taxes
and interest, and make substantial distributions before regaining its tax sta-
tus as a regulated investment company.
 
                      FUNDAMENTAL INVESTMENT LIMITATIONS
   
  Each Fund is subject to the following fundamental investment limitations,
which cannot be changed in any way without the approval of the holders of a
majority of the affected Fund's shares. For these purposes, a "majority" of a
Fund's shares means shares representing the lesser of (i) 67% or more of the
votes cast to approve a change, so long as shares representing more than 50%
of the Fund's net asset value are present or represented by proxy; or (ii)
more than 50% of a Fund's net asset value.     
 
  Borrowing. A Fund may not borrow money, except for temporary or emergency
purposes in an amount not exceeding 15% of the Fund's net assets. The Fund may
borrow money through banks or Vanguard's interfund lending program only, and
must comply with all applicable regulatory conditions.
 
  Commodities. A Fund may not purchase or sell commodities, except that the
LifeStrategy Income, LifeStrategy Growth, LifeStrategy Moderate Growth,
LifeStrategy Conservative Growth, and Total International Stock Index Funds
may invest in futures contracts and options transactions. No more than 5% of a
Fund's total assets may be used as initial margin deposit for futures con-
tracts, and no more than 20% of a Fund's total assets may be invested in
futures contracts or options at any time.
 
  Illiquid. A Fund may not acquire any security if, as a result, more than 15%
of its net assets would be invested in securities that are illiquid.
 
  Investing for Control. A Fund may not invest in a company for the purpose of
controlling its management.
 
  Loans. A Fund may not lend money to any person except by purchasing bonds
and other debt securities that are publicly distributed or customarily pur-
chased by institutional investors, by entering into repurchase agreements, or
through Vanguard's interfund lending program.
 
  Margin. A Fund may not purchase securities on margin or sell securities
short, except as permitted by the Fund's investment policies relating to com-
modities.
 
                                                                            B-3
<PAGE>
 
  Oil, gas, minerals. A Fund may not invest in interests in oil, gas or other
mineral exploration or development programs.
 
  Puts, calls. A Fund may not purchase or sell puts or calls.
 
  Pledging assets. A Fund may not pledge, mortgage or hypothecate more than
15% of its net assets.
 
  Real Estate. A Fund may not invest directly in real estate.
 
  Senior securities. A Fund may not issue senior securities, except in compli-
ance with the 1940 Act.
 
  Underwriting. A Fund may not engage in the business of underwriting securi-
ties issued by other persons. A Fund will not be considered an underwriter
when disposing of its investment securities.
 
  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 restrictions.
 
  The investment limitations set forth above relate only to the Funds of the
Trust, and may not necessarily apply to the underlying funds in which the
Funds invest. Thus, while a Fund may not invest directly in real estate, for
example, it may do so indirectly if one of the underlying funds does so.
 
                              INVESTMENT POLICIES
 
  The following policies supplement the Trust's investment policies set forth
in the Prospectus:
   
Repurchase Agreements     
   
  Each Fund of the Trust (and each of the underlying Vanguard funds) may in-
vest in repurchase agreements with commercial banks, brokers or dealers to
generate income from its excess cash balances. A repurchase agreement is an
agreement under which a Fund acquires a fixed-income security (generally a se-
curity issued by the U.S. Government or an agency thereof, a banker's accept-
ance or a certificate of deposit) from a commercial bank, broker or dealer,
subject to resale to the seller at an agreed upon price and date (normally,
the next business day). A repurchase agreement may be considered a loan col-
lateralized by securities. The resale price reflects an agreed upon interest
rate effective for the period the instrument is held by a Fund and is unre-
lated to the interest rate on the underlying instrument. In these transac-
tions, the securities acquired by a Fund (including accrued interest earned
thereon) must have a total value in excess of the value of the repurchase
agreement and are held by a Fund's custodian bank until repurchased. In addi-
tion, the Trust's Board of Trustees will monitor each Fund's repurchase agree-
ment transactions generally and will establish guidelines and standards for
review of the creditworthiness of any bank, broker or dealer party to a repur-
chase agreement with a Fund.     
 
  The use of repurchase agreements involves certain risks. For example, if the
other party to the agreement defaults on its obligation to repurchase the un-
derlying security at a time when the value of the security has declined, a
Fund may incur a loss upon disposition of the security. If the other party to
the agreement becomes insolvent and subject to liquidation or reorganization
under the Bankruptcy Code or other laws, a court may determine that the under-
lying security is collateral for a loan by a Fund not within the control of
the Fund and therefore the realization by the Fund on such collateral may be
automatically stayed. Finally, it is possible that a Fund may not be able to
substantiate its interest in
 
B-4
<PAGE>
 
the underlying security and may be deemed an unsecured creditor of the other
party to the agreement. While the Trust's management acknowledges these risks,
it is expected that they can be controlled through careful monitoring proce-
dures.
 
Futures Contracts
   
  LifeStrategy Income, LifeStrategy Growth, LifeStrategy Moderate Growth,
LifeStrategy Conservative Growth, and Total International Stock Index Funds
(as well as most of their underlying funds) may enter into futures contracts,
options, and options on futures contracts for several reasons: to maintain
cash reserves while remaining fully invested, to facilitate trading, to reduce
transaction costs, or to seek higher investment returns when a futures con-
tract is priced more attractively than the underlying equity security or in-
dex. Futures contracts provide for the future sale by one party and purchase
by another party of a specified amount of a specific security 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 Com-
modity Exchange Act by the Commodity Futures Trading Commission (CFTC), a U.S.
Government agency. Assets committed to futures contracts will be segregated to
the extent required by law.     
   
  Although futures contracts by their terms call for actual delivery or ac-
ceptance of the underlying securities, in most cases the contracts are closed
out before the settlement date without the making or taking of delivery. Clos-
ing out an open futures position is done by taking an opposite position (buy-
ing a contract which has previously been sold, or selling a contract previ-
ously purchased) in an identical contract to terminate the position. Brokerage
commissions are incurred when a futures contract is bought or sold.     
 
  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 comple-
tion 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. Bro-
kers 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 con-
tract 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 Funds expect
to earn interest income on their margin deposits.
 
  Trades in futures contracts may be broadly classified as either "hedgers" or
"speculators." Hedgers use the futures markets primarily to offset unfavorable
changes in the value of securities otherwise held for investment purposes or
expected to be acquired by them. Speculators are less inclined to own the se-
curities underlying the futures contracts which they trade, and use futures
contracts with the expectation of realizing profits from fluctuations in the
prices of underlying securities. The Funds intend to use futures contracts
only for bona fide hedging purposes.
 
  Regulations of the CFTC applicable to the Funds require that all of their
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 a Fund's
portfolio. The Funds will only sell futures contracts to protect securities it
owns against price declines or purchase contracts to protect against an in-
crease in the price of securities it intends to purchase. As evidence of this
hedging interest, the Funds expect that approximately 75% of all futures
 
                                                                            B-5
<PAGE>
 
contract purchases will be "completed;" that is, equivalent amounts of related
securities will have been purchased or are being purchased by the Funds upon
sale of open futures contracts.
 
  Although techniques other than the sale and purchase of futures contracts
could be used to control a Fund's exposure to market fluctuations, the use of
futures contracts may be a more effective means of hedging this exposure.
While the Funds will incur commission expenses in both opening and closing out
futures positions, these costs are lower than transaction costs incurred in
the purchase and sale of the underlying securities.
 
Restrictions on the Use of Futures Contracts
 
  A Fund will not enter into futures contract transactions to the extent that,
immediately thereafter, the sum of its initial margin deposits on open con-
tracts exceeds 5% of the market value of the Fund's total assets. In addition,
the Fund will not enter into futures contracts to the extent that its out-
standing obligations to purchase securities under these contracts would exceed
20% of the Fund's total assets.
 
Risk Factors in Futures Transactions
 
  Positions in futures contracts may be closed out only on an Exchange which
provides a secondary market for such futures. However, there can be no assur-
ance that a liquid secondary market will exist for any particular futures con-
tract at any specific time. Thus, it may not be possible to close a futures
position. In the event of adverse price movements, a 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 disad-
vantageous to do so. In addition, the Fund may be required to make delivery of
the instruments underlying futures contracts it holds. The inability to close
options and futures positions also could have an adverse impact on the ability
to effectively hedge. The Funds will minimize the risk that they will be un-
able 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 liq-
uid secondary market.
 
  The risk of loss in trading futures contracts in some strategies can be sub-
stantial, 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 sub-
stantial loss (as well as 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. However, because the futures
strategies of the Funds are engaged in only for hedging purposes, the Advisers
do not believe that the Funds are subject to the risks of loss frequently as-
sociated with futures transactions. The Funds would presumably have sustained
comparable losses if, instead of the futures contract, they had invested in
the underlying financial instrument and sold it after the decline.
 
  Utilization of futures transactions by a Fund does involve the risk of im-
perfect or no correlation where the securities underlying futures contracts
have different maturities than the portfolio securities being hedged. It is
also possible that a 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 a Fund of margin deposits in the event of bankruptcy of a bro-
ker 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 futures
contract prices during a single trading day. The daily limit establishes the
maximum amount that the price of a futures con-     
 
B-6
<PAGE>
 
tract 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 par-
ticular 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 fu-
ture positions and subjecting some futures traders to substantial losses.
 
Federal Tax Treatment of Futures Contracts
 
  Except for transactions which the Funds have identified as hedging transac-
tions, each Fund is required for Federal income tax purposes to recognize as
income for each taxable year its net unrealized gains and losses on certain
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 a Fund may affect
the holding period of such securities and, consequently, the nature of the
gain or loss on such securities upon disposition. A Fund may be required to
defer the recognition of losses on futures contracts to the extent of any un-
recognized gains on related positions held by the Fund.
 
  In order for the Funds to continue to qualify for Federal income tax treat-
ment as a regulated investment company, at least 90% of each Fund's gross in-
come for a taxable year must be derived from qualifying income; i.e., divi-
dends, interest, income derived from loans of securities, gains from the sale
of securities or foreign currencies, or other income derived with respect to
the Fund's business of investing in securities. It is anticipated that any net
gain realized from the closing out of futures contracts will be considered
qualifying income for purposes of the 90% requirement.
 
  The Funds 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 transac-
tions. Such distributions will be combined with distributions of capital gains
realized on the Funds' other investments and shareholders will be advised on
the nature of the transactions.
 
Illiquid Securities
 
  Each underlying fund may invest up to 15% (10% for Prime Money Market Fund)
of its net assets in illiquid securities. Illiquid securities are securities
that may not be sold or disposed of in the ordinary course of business within
seven business days at approximately the value at which they are being carried
on the fund's books.
 
  The underlying funds may invest in restricted, privately placed securities
that, under SEC rules, may be sold only to qualified institutional buyers. Be-
cause these securities can be resold only to qualified institutional buyers,
they may be considered illiquid securities--meaning that they could be diffi-
cult for the funds to convert to cash if needed.
 
  If a substantial market develops for a restricted security held by a fund,
it will be treated as a liquid security, in accordance with procedures and
guidelines approved by the funds' Board of Trustees. This generally includes
securities that are unregistered that can be sold to qualified institutional
buyers in accordance with Rule 144A under the 1933 Act. While each fund's in-
vestment adviser determines the liquidity of restricted securities on a daily
basis, the Board oversees and retains ultimate responsibility for the advis-
er's decisions. Several factors the Board considers in monitoring these deci-
sions include the valuation of a security, the availability of qualified in-
stitutional buyers, and the availability of information about the security's
issuer.
 
                                                                            B-7
<PAGE>
 
Lending of Securities
   
  The Funds (or any underlying fund) may lend its investment securities to
qualified institutional investors (typically brokers, dealers, banks or other
financial institutions) who need to borrow securities in order to complete
certain transactions, such as covering short sales, avoiding failures to de-
liver securities or completing arbitrage operations. By lending its securi-
ties, a Fund will be attempting to increase its net investment income through
the receipt of interest on the loan. Any gain or loss in the market price of
the securities loaned that might occur during the term of the loan would be
for the account of the Fund. The terms and the structure and the aggregate
amount of such loans must be consistent with the 1940 Act and the Rules and
Regulations or interpretations of the Commission thereunder. These provisions
limit the amount of securities a fund may lend to 33 1/3% of the fund's total
assets, and require that (a) the borrower pledge and maintain with the fund
collateral consisting of cash, an irrevocable letter of credit or securities
issued or guaranteed by the United States Government having a value at all
times not less than 100% of the value of the securities loaned, (b) the bor-
rower add to such collateral whenever the price of the securities loaned rises
(i.e., the borrower "marks to the market" on a daily basis), (c) the loan be
made subject to termination by the fund at any time and (d) the fund receive
reasonable interest on the loan which may include the fund's investing any
cash collateral in interest bearing short-term investments, any distribution
on the loaned securities and any increase in their market value. Loan arrange-
ments made by a fund will comply with all other applicable regulatory require-
ments, including the rules of the New York Stock Exchange, which rules pres-
ently require the borrower, after notice, to redeliver the securities within
the normal settlement time of three business days. All relevant facts and cir-
cumstances, including the credit-worthiness of the broker, dealer, or institu-
tion, will be considered in making decisions with respect to the lending of
securities, subject to review by the Trust's Board of Trustees.     
 
Foreign Investments
 
  Each underlying fund in which the Funds invest may invest its assets in se-
curities of foreign companies. Investors should recognize that investing in
foreign companies involves certain special considerations which are not typi-
cally associated with investing in U.S. companies.
 
Currency Risk
 
  Since the stocks of foreign companies are frequently dominated in foreign
currencies, and since the funds may temporarily hold uninvested reserves in
bank deposits in foreign currencies, the funds will be affected favorable or
unfavorable by changes in currency rates and in exchange control regulations,
and may incur costs in connection with conversions between various currencies.
 
Country Risk
 
  As foreign countries are not generally subject to uniform accounting, audit-
ing, and financial reporting standards and practices comparable to those ap-
plicable to domestic companies, there may be less publicly available informa-
tion about certain foreign companies than about domestic companies. Securities
of some foreign companies are generally less liquid and more volatile than se-
curities of comparable domestic companies. There is generally less government
supervision and regulation of stock exchanges, brokers, and listed companies
than in the U.S. In addition, with respect to certain foreign countries, there
is the possibility of expropriation or confiscatory taxation, political or so-
cial instability, or diplomatic developments which could affect U.S. invest-
ments in those countries.
 
  Although the funds will endeavor to achieve most favorable execution costs
in their portfolio transactions, fixed commissions on many foreign stock ex-
changes are generally higher than negotiated commissions on U.S. exchanges. In
addition, it is expected that the expenses for custodial arrangements of
 
B-8
<PAGE>
 
the funds' foreign securities will be somewhat greater than the expenses for
custodial arrangements for handling U.S. securities of equal value.
 
  Certain foreign governments levy withholding taxes against dividend and in-
terest income. Although in some countries a portion of theses taxes is recov-
erable, the non-recovered portion of foreign withholding taxes will reduce the
income received from foreign companies held by each fund. However, these for-
eign withholding taxes are not expected to have a significant impact on the
funds.
 
Federal Tax Treatment of Non-U.S. Transactions
 
  Special rules govern the Federal income tax treatment of certain transac-
tions denominated in foreign currency or determined by reference to the value
of one or more foreign currencies. The types of transactions covered by the
special rules include the following: (i) the acquisition of, or becoming the
obligor under, a bond or other debt instrument (including, to the extent pro-
vided in Treasury regulations, preferred stock); (ii) the accruing of certain
trade receivables and payables; and (iii) the entering into or acquisition of
any forward contract, futures contract, option and similar financial instru-
ment if such instrument is not marked to market. The disposition of a currency
other than the U.S. dollar by a U.S. taxpayer is also treated as a transaction
subject to the special currency rules. However, foreign currency-related regu-
lated futures contracts and nonequity options are generally not subject to the
special currency rules if they are or would be treated as sold for their fair
market value at year-end under the marking-to-market rules applicable to other
futures contracts unless an election is made to have such currency rules ap-
ply. With respect to transactions covered by the special rules, foreign cur-
rency gain or loss is calculated separately from any gain or loss on the un-
derlying transaction is normally taxable as ordinary gain or loss. A taxpayer
may elect to treat as capital gain or loss foreign currency gain or loss aris-
ing from certain identified forward contracts, futures contracts and options
that are capital assets in the hands of the taxpayer and which are not part of
a straddle. The Treasury Department issued regulations under which certain
transactions subject to the special currency rules that are part of a "section
988 hedging transaction" (as defined in the Internal Revenue Code of 1986, as
amended, and the Treasury regulations) will be integrated and treated as a
single transaction or otherwise treated consistently for purposes of the Code.
Any gain or loss attributable to the foreign currency component of a transac-
tion engaged in by a fund which is not subject to the special currency rules
(such as foreign equity investments other than certain preferred stocks) will
be treated as capital gain or loss and will not be segregated from the gain or
loss on the underlying transaction.
 
Vanguard Interfund Lending Program
 
  The Commission has issued an exemptive order permitting the Funds to partic-
ipate in Vanguard's interfund lending program. This program allows the Van-
guard funds to borrow money from and loan money to each other for temporary or
emergency purposes. The program is subject to a number of conditions, includ-
ing the requirement that no fund may borrow or lend money through the program
unless it receives a more favorable interest rate than is available from a
typical bank for a comparable transaction. In addition, a fund may participate
in the program only if and to the extent that such participation is consistent
with the fund's investment objective and other investment policies.
 
Temporary Investments
 
  Each underlying fund in which the Funds invest may take temporary defensive
measures that are inconsistent with the funds' normal fundamental or non-fun-
damental investment policies and strategies in response to adverse market,
economic, political or other conditions. Such measures could include invest-
ments in (a) highly liquid short-term fixed income securities issued by or on
behalf of municipal or corporate issuers, obligations of the U.S. Government
and its agencies, commercial paper, and bank certificates of deposit; (b)
shares of other investment companies which have investment objectives consis-
tent with those of the fund; (c) repurchase agreements involving any such se-
curities; and (d) other money market instruments. There is no limit on the ex-
tent to which the funds may take temporary defensive measures. In taking such
measures, the funds may fail to achieve their investment objective.
 
                                                                            B-9
<PAGE>
 
                            MANAGEMENT OF THE TRUST
 
Officers and Trustees
 
  The Officers of the Trust manage its day-to-day operations and are responsi-
ble to the Trust's Board of Trustees. The Trustees set broad policies for the
Trust and choose its Officers. The following is a list of the Trustees and Of-
ficers of the Trust and a statement of their present positions and principal
occupations during the past five years. As a group, the Trust's Trustees and
Officers own less than 1% of the outstanding shares of each Fund of the Trust.
Each Trustee also serves as a Director of The Vanguard Group, Inc., and as a
Trustee of each of the 36 investment companies administered by Vanguard (35 in
the case of Mr. Malkiel and 28 in the case of Mr. MacLaury). The mailing ad-
dress of the Trustees and Officers of the Trust is Post Office Box 876, Valley
Forge, PA 19482.
 
JOHN C. BOGLE, (DOB: 5/8/1929) Senior Chairman and Trustee*
Senior Chairman and Director of The Vanguard Group, Inc., and Trustee of each
of the investment companies in The Vanguard Group; Director of The Mead Corp.
(Paper Products), General Accident Insurance, and Chris-Craft Industries, Inc.
(Broadcasting & Plastics Manufacturer).
 
JOHN J. BRENNAN, (DOB: 7/29/1954) Chairman, Chief Executive Officer & Trustee*
Chairman, Chief Executive Officer and Director of The Vanguard Group, Inc.,
and Trustee of each of the investment companies in The Vanguard Group.
 
JOANN HEFFERNAN HEISEN, (DOB: 1/25/1950) Trustee
Vice President, Chief Information Officer, and member of the Executive Commit-
tee of Johnson and Johnson (Pharmaceuticals/Consumer Products), Director of
Johnson & Johnson*MERCK Consumer Pharmaceuticals Co., Women First HealthCare,
Inc. (Research and Education Institution), Recording for the Blind and
Dyslexic, The Medical Center at Princeton, and Women's Research and Education
Institute.
 
BRUCE K. MACLAURY, (DOB: 5/7/1931) Trustee
President Emeritus of The Brookings Institution (Independent Non-Partisan Re-
search Organization): Director of American Express Bank, Ltd., The St. Paul
Companies, Inc. (Insurance and Financial Services), and National Steel Corp.
 
BURTON G. MALKIEL, (DOB: 8/28/1932) Trustee
Chemical Bank Chairman's Professor of Economics, Princeton University; Direc-
tor of Prudential Insurance Co. of America, Banco Bilbao Gestinova, Baker
Fentress & Co. (Investment Management), The Jeffrey Co. (Holding Company), and
Southern New England Telecommunications Co.
 
ALFRED M. RANKIN, Jr., (DOB: 10/8/1941) Trustee
Chairman, President, Chief Executive Officer, and Director of NACCO Industries
(Machinery/Coal/Appliances); Director of The BFGoodrich Co. (Aircraft
Systems/Manufacturing/Chemicals), and The Standard Products Co. (Rubber Prod-
ucts Company).
 
JOHN C. SAWHILL, (DOB: 6/12/1936) Trustee
President and Chief Executive Officer of The Nature Conservancy (Non-Profit
Conservation Group); Director of Pacific Gas and Electric Co., Procter & Gam-
ble Co., NACCO Industries (Machinery/Coal/Appliances), and Newfield Explora-
tion Co. (Energy); formerly, Director and Senior Partner of McKinsey & Co.,
and President of New York University.
 
JAMES O. WELCH, Jr., (DOB: 5/13/1931) Trustee
Retired Chairman of Nabisco Brands, Inc. (Food Products); retired Vice Chair-
man and Director of RJR Nabisco (Food and Tobacco Products); Director of TECO
Energy, Inc., and Kmart Corp.
 
J. LAWRENCE WILSON, (DOB: 3/2/1936) Trustee
Chairman and Chief Executive Officer of Rohm & Haas Co. (Chemicals); Director
of Cummins Engine Co.(Diesel Engine Company), and The Mead Corp. (Paper Prod-
ucts); and Trustee of Vanderbilt University.
 
RAYMOND J. KLAPINSKY, (DOB: 12/7/1938) Secretary*
Managing Director of The Vanguard Group, Inc.; Secretary of The Vanguard
Group, Inc. and of each of the investment companies in The Vanguard Group.
 
B-10
<PAGE>
 
THOMAS J. HIGGINS, (DOB: 5/21/1957) Treasurer*
Principal of The Vanguard Group, Inc.; Treasurer of each of the investment
companies in The Vanguard Group.
 
ROBERT D. SNOWDEN, (DOB: 9/4/1961) Controller*
Principal of The Vanguard Group, Inc.; Controller of each of the investment
companies in The Vanguard Group.
- --------
   
*Officers of the Trust are "interested persons" as defined in the 1940 Act.
       
  The Trustees and Officers of the Trust will receive no remuneration from the
Trust. However, the Trustees are also Trustees of The Vanguard Group, Inc.
(Vanguard) and of the Trust's underlying investment companies in The Vanguard
Group (the Vanguard funds). Each Vanguard Trust pays its unaffiliated Trustees
an annual fee plus a proportionate share of travel and other expenses incurred
in attending Board meetings. The Officers are paid by Vanguard which, in turn,
is reimbursed by each Vanguard Trust for its proportionate share of Officers'
salaries and benefits.     
          
The Vanguard Group     
   
General     
   
  The Trust is part of the Vanguard family of mutual funds, which consists of
more than 35 investment companies with over 100 separate investment portfolios
(the Vanguard funds). Each of the Vanguard funds receives at cost from The
Vanguard Group, Inc. (Vanguard) virtually all of its administrative and dis-
tribution services. Vanguard also provides investment advisory services at
cost to certain Vanguard funds; other Vanguard funds are advised by indepen-
dent advisers unaffiliated with Vanguard.     
   
  Vanguard is jointly owned by all of the Vanguard investment companies except
the Trust and one other investment company (the Member Trusts). Each of the
Member Trusts contributes to Vanguard's capitalization, and pays its share of
Vanguard's expenses, pursuant to formulas determined by the Member Trusts'
boards of trustees. The Trust is not a Member Trust because it contributes to
Vanguard's capitalization and expenses indirectly through ownership of certain
Vanguard funds. It is possible that, in the future, the Trust may become a
Member Trust, but this will only happen on terms that assure that the Trust
will not bear any duplicative capital contribution or expense allocation
costs.     
   
Special Servicing Agreement     
   
  The Trust and Vanguard have entered into a Special Servicing Agreement under
which Vanguard provides the Trust with administrative and distribution servic-
es, including dividend disbursing, shareholder servicing, and transfer agency
services. The Agreement provides that the Trust pays Vanguard for the cost of
providing these services, and bear the cost of services provided by outside
parties, such as auditors, custodians, and outside legal counsel, as well as
taxes and other direct expenses of the Trust. The Agreement further provides
that the Trust's expenses will be offset, in whole or in part, by reimburse-
ment from Vanguard for (a) contributions made by the Trust to the cost of op-
erating the Vanguard funds in which the Trust invests, and (b) certain savings
in administrative and marketing costs that Vanguard is expected to derive from
the operation of the Trust. The Trust's Board of Trustees believe that the re-
imbursements to be made by Vanguard to the Trust should be sufficient to off-
set most or all of the expenses incurred by each Fund of the Trust. Therefore,
the Funds are expected to operate at a very low--or zero--expense ratio. For
the fiscal year ended December 31, 1998, all of the STAR Funds in fact had ex-
pense ratios of zero. Of course, there is no guarantee that this will always
be the case.     
   
  Although the STAR Funds are expected to operate at a zero expense ratio af-
ter reimbursement, they will bear indirectly, as shareholders of the under-
lying Vanguard funds, the costs associated with operating those funds. As of
December 31, 1998, it is estimated that the indirect expense ratio of the STAR
Funds was as follows: STAR Fund--[0.37%]; LifeStrategy Income Fund--[0.29%];
LifeStrategy Conservative Growth Fund--[0.29%]; LifeStrategy Moderate Growth
Fund--[0.29%]; LifeStrategy Growth Fund--[0.29%]; Total International Stock
Index Fund--[0.34%].     
 
                                                                           B-11
<PAGE>
 
   
Code of Ethics     
   
  Vanguard has adopted a Code of Ethics designed to prevent certain officers
and employees of Vanguard who may have access to nonpublic information about
the trading activities of Vanguard funds from profiting from that information.
The Code places substantive and procedural restrictions on securities trades
by Vanguard access persons and their immediate family members. For example,
the Code requires that access persons receive advance approval for every secu-
rities trade to ensure that there is no conflict with the trading activities
of Vanguard funds. The provisions of Vanguard's Code of Ethics are similar to,
and in many cases more restrictive than, those recommended by a blue ribbon
panel of mutual fund industry executives.     
                          
                       INVESTMENT ADVISORY SERVICES     
   
  The Vanguard STAR Funds do not employ an investment adviser. The allocation
of each Fund's assets among the underlying Vanguard funds is made by Officers
of the Trust pursuant to instructions of the Trust's Board of Trustees and in
conformity with each Fund's investment objective, strategies, and policies.
The Declaration of Trust authorizes the Trustees to retain an investment ad-
viser if they determine that such action is in the best interests of the
shareholders of each Fund. The Trustees have no present intention to retain an
investment adviser for any of the STAR Funds. A Fund could not retain an in-
vestment adviser without first obtaining shareholder approval.     
   
  The STAR Funds benefit from the investment advisory services provided to the
underlying Vanguard funds and, as shareholders of those funds, indirectly bear
a proportionate share of those funds' advisory fees. The following is a de-
scription of the investment advisory agreements for each underlying Vanguard
fund.     
 
                             VANGUARD WINDSOR FUND
   
  Wellington Management Company, LLP (WMC) serves as investment adviser to
Vanguard Windsor Fund. Windsor Fund pays WMC a basic fee, calculated by apply-
ing a quarterly rate, based on the following annual percentage rates, to Wind-
sor Fund's average month-end net assets for the quarter:     
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $17.5 billion.................................................. .125%
     Over $17.5 billion................................................... .100%
</TABLE>
   
  The basic fee may be increased or decreased by applying an adjustment for-
mula based on Windsor Fund's investment performance. The formula provides for
an increase or decrease in the basic fee paid to WMC each quarter, depending
upon Windsor Fund's investment performance for the thirty-six months preceding
the end of the quarter relative to the investment record of the Standard and
Poor's 500 Composite Stock Price Index (the S&P 500) for the same period.     
 
  During the fiscal years ended October 31, 1996, 1997, and 1998, Windsor Fund
incurred the following advisory fees:
 
<TABLE>   
<CAPTION>
                                          1996          1997          1998
                                       -----------  ------------  ------------
     <S>                               <C>          <C>           <C>
     Basic Fee........................ $18,816,000  $ 23,502,000  $ 24,971,000
     Increase (Decrease) for
      Performance Adjustment..........  (4,417,000)  (11,821,000)  (15,501,000)
                                       -----------  ------------  ------------
     Total............................ $14,399,000  $ 11,681,000  $  9,470,000
                                       ===========  ============  ============
</TABLE>    
   
  Effective June 1, 1999, Windsor Fund's Board of Trustees has decided to add
Sanford C. Bernstein & Co. as a co-adviser of the fund. Sanford Bernstein is
an investment advisory firm based in New York.     
 
B-12
<PAGE>
 
                          VANGUARD MORGAN GROWTH FUND
 
  Vanguard Morgan Growth Fund employs three separate investment advisers, each
of whom manages the investment and reinvestment of a portion of the fund's as-
sets.
 
Wellington Management Company, LLP
   
  Morgan Fund employs Wellington Management Company, LLP (WMC) under an in-
vestment advisory agreement to manage the investment and reinvestment of ap-
proximately 39% of the fund's assets and to continuously review, supervise and
administer the fund's investment program. WMC discharges its responsibilities
subject to the control of Morgan's Officers and Trustees.     
   
  WMC is a Massachusetts limited liability partnership and  the following per-
sons serve as managing partners: Messrs. Robert W. Doran, Duncan M. McFarland,
and John R. Ryan.     
   
  Morgan Fund pays WMC a basic fee at the end of each fiscal quarter, calcu-
lated by applying a quarterly rate, based on the following annual percentage
rates, to the fund's average month-end net assets for the quarter:     
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $500 million................................................... .175%
     Next $500 million.................................................... .100%
     Assets in excess of $1 billion....................................... .075%
</TABLE>
   
  The basic fee may be increased or decreased by applying an incentive/penalty
fee based on the investment performance of the fund's assets managed by WMC,
over a 36-month period, relative to the investment record of a benchmark index
composed of the stocks held in the country's 50 largest growth stock mutual
funds (the Growth Fund Stock Index).     
   
  During the last three fiscal years, Morgan Fund incurred the following advi-
sory fees to WMC:     
 
<TABLE>   
<CAPTION>
                                                 1996       1997        1998
                                              ---------- ----------  ----------
     <S>                                      <C>        <C>         <C>
     Basic Fee............................... $1,084,780 $1,292,417  $1,541,922
     Increase (Decrease) for Performance
      Adjustment.............................     51,915    (63,493)     76,371
                                              ---------- ----------  ----------
     Total................................... $1,136,695 $1,228,924  $1,618,293
                                              ========== ==========  ==========
</TABLE>    
 
Franklin Portfolio Associates LLC
   
  Morgan Fund employs Franklin Portfolio Associates LLC under an investment
advisory agreement to manage the investment and reinvestment of approximately
43% of the fund's assets. Franklin Portfolio Associates discharges its respon-
sibilities subject to the control of the Officers and Trustees of the fund.
       
  Franklin Portfolio Associates is a Massachusetts limited liability company.
The shares of Franklin Portfolio Associates are owned by MBC Investments Cor-
poration, a holding company of Mellon Bank Corporation.     
 
                                                                           B-13
<PAGE>
 
   
  Morgan Fund pays Franklin Portfolio Associates a basic fee by applying vari-
ous percentage rates to the average net assets of the fund managed by Franklin
Portfolio Associates. The fee schedule is as follows:     
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $100 million................................................... 0.25%
     Next $200 million.................................................... 0.20%
     Next $200 million.................................................... 0.15%
     Assets in excess of $500 million..................................... 0.10%
</TABLE>
   
  The basic fee may be increased or decreased by applying an incentive/penalty
fee based on the investment performance of the assets of the fund managed by
Franklin Portfolio Associates, over a 36-month period, relative to the invest-
ment record of the Growth Fund Stock Index.     
   
  During the fiscal years ended December 31, 1996, 1997, and 1998, Morgan Fund
incurred advisory fees to Franklin Portfolio Associates as follows:     
 
<TABLE>   
<CAPTION>
                                                  1996       1997       1998
                                               ---------- ---------- ----------
     <S>                                       <C>        <C>        <C>
     Basic Fee................................ $  987,145 $1,310,220 $1,701,152
     Increase (Decrease) for Performance
      Adjustment..............................    115,797    571,862    383,794
                                               ---------- ---------- ----------
     Total.................................... $1,102,942 $1,882,082 $2,084,946
                                               ========== ========== ==========
</TABLE>    
 
Vanguard's Core Management Group
   
  Vanguard's Core Management Group provides investment advisory services on an
at-cost basis with respect to approximately 18% of Morgan Fund's assets. Core
Management Group employs a quantitative investment approach that uses computer
techniques to track--and, if possible, outperform--the Growth Fund Stock In-
dex. During the fiscal years ended December 31, 1996, 1997, and 1998, Morgan
Fund paid approximately $70,774, $219,000, and $317,000, respectively, to re-
imburse Vanguard for the costs it incurred in providing investment advisory
services to the fund.     
 
 
B-14
<PAGE>
 
                  
               VANGUARD GNMA AND LONG-TERM CORPORATE FUNDS     
 
  Wellington Management Company, LLP (WMC) serves as investment adviser to
GNMA and Long-Term Corporate Funds. Each of the funds pays WMC an investment
advisory fee at the end of each fiscal quarter, calculated by applying a quar-
terly rate to the average month-end net assets of each fund.
 
                              Vanguard GNMA Fund
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $3 billion..................................................... .020%
     Next $3 billion...................................................... .010%
     Assets in excess of $6 billion....................................... .008%
</TABLE>
 
                       Vanguard Long-Term Corporate Fund
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $1 billion..................................................... .040%
     Next $1 billion...................................................... .030%
     Next $1 billion...................................................... .020%
     Assets in excess of $3 billion....................................... .015%
</TABLE>
 
  During the fiscal years ended January 31, 1997, 1998, and 1999, GNMA and
Long-Term Corporate Funds paid WMC the following advisory fees:
 
<TABLE>   
<CAPTION>
     Fund                                           1997      1998       1999
     ----                                         -------- ---------- ----------
     <S>                                          <C>      <C>        <C>
     GNMA........................................ $992,000 $1,067,000 $1,229,000
                                                  ======== ========== ==========
     Long-Term Corporate......................... $951,000 $  963,000 $1,048,000
                                                  ======== ========== ==========
</TABLE>    
                       
                    VANGUARD SHORT-TERM CORPORATE FUND     
   
  Vanguard Short-Term Corporate Fund receives its investment advisory services
on an "internalized," at-cost basis from an investment management staff em-
ployed directly by Vanguard. This staff, Vanguard Fixed Income Group (the
Group), also provides investment advisory services to several other Vanguard
funds. The compensation and other expenses of the Group are allocated among
the various funds utilizing the Group's services. During the fiscal years ended
January 31, 1997, 1998, and 1999, Short-Term Corporate Fund's share of these 
expenses totaled approximately $543,000, $698,000, and $671,000, respectively.
     

 
 
                                                                           B-15
<PAGE>
 
                              VANGUARD WINDSOR II
 
  Vanguard Windsor II Fund employs a "multi-manager" approach utilizing four
investment advisers, each of whom manages the investment and reinvestment of a
portion of the fund's assets.
 
Barrow, Hanley, Mewhinney & Strauss
   
  Windsor II Fund has entered into an investment advisory agreement with Bar-
row, Hanley, Mewhinney & Strauss, Inc. (BHM&S) to manage a portion of the
fund's equity assets (currently approximately 67%). Under this agreement,
BHM&S manages the investment and reinvestment of the designated assets and
continuously reviews, supervises, and administers the investment program of
the fund with respect to those assets. BHM&S discharges its responsibilities
subject to the control of the Officers and Trustees of the fund.     
 
  BHM&S is a Texas corporation controlled by the following officers of BHM&S:
James Purdy Barrow, Principal; Bryant Miller Hanley, Jr., President, Secre-
tary, and Treasurer; Michael Christopher Mewhinney, Principal; and John Luke
Strauss, Principal.
   
  Windsor II Fund pays BHM&S a basic fee at the end of each fiscal quarter,
calculated by applying a quarterly rate, based on the following annual per-
centage rates, to the average month-end net assets of the fund managed by
BHM&S for the quarter:     
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $200 million................................................... .300%
     Next $300 million.................................................... .200%
     Next $500 million.................................................... .150%
     Assets in excess of $1 billion....................................... .125%
</TABLE>
   
  The basic fee paid to BHM&S, as provided above, will be increased or de-
creased by applying an incentive/penalty fee adjustment based on the invest-
ment performance of the assets of the fund managed by BHM&S over a trailing
36-month period relative to that of the Standard & Poor's 500/BARRA Value In-
dex (the BARRA Value Index). The BARRA Value Index includes stocks in the
Standard and Poor's 500 Composite Stock Price Index with lower than average
ratios of market price to book value. These types of stocks are often referred
to as "value" stocks.     
   
  During the fiscal years ended October 31, 1996, 1997 and 1998, the fund in-
curred advisory fees to BHM&S of approximately $11,475,528, $16,925,953, be-
fore a performance increase of $2,495,021, and $24,225,773, before a perfor-
mance increase of $3,887,915, respectively.     
 
Equinox Capital Management, Inc.
   
  Windsor II Fund has entered into an investment advisory agreement with Equi-
nox Capital Management, Inc. (Equinox) to manage a portion of the fund's eq-
uity assets (currently approximately 12%). Under this agreement, Equinox man-
ages the investment and reinvestment of the designated assets and continuously
reviews, supervises, and administers the investment program of the fund with
respect to those assets. Equinox discharges its responsibilities subject to
the control of the Officers and Trustees of the fund.     
 
  Equinox is a Delaware corporation controlled by the following officers of
Equinox: Ronald J. Ulrich, Director and President; Wendy D. Lee, Managing Di-
rector; David E. Walker, Principal; Laura Starr, Vice President; Jacqueline A.
Williams, Vice President; Mark W. Watson, Vice President; and Kenneth J.
Doerr, Vice President.
 
B-16
<PAGE>
 
   
  Windsor II Fund pays Equinox a basic fee by applying a quarterly rate, based
on the following annual percentage rates, to the portion of the fund's average
month-end net assets managed by Equinox. The fee schedule is as follows:     
 
<TABLE>
<CAPTION>
     Net Assets                                                      Annual Rate
     ----------                                                      -----------
     <S>                                                             <C>
     First $400 million.............................................    .200%
     Next $600 million..............................................    .150%
     Next $1 billion................................................    .125%
     Assets in excess of $2 billion.................................    .100%
</TABLE>
 
  The basic fee paid to Equinox may be increased or decreased by applying an
adjustment formula based on the 36-month investment performance of the fund's
assets managed by Equinox relative to the investment record of the Russell
1000 Value Index.
   
  During the fiscal years ending October 31, 1996, 1997, and 1998, Windsor II
Fund incurred advisory fees to Equinox of approximately $1,980,458 before a
performance adjustment of $4,747, $2,791,342 before a performance adjustment
of $408,295, and $3,945,052 before a performance adjustment of $868,234, re-
spectively.     
 
Tukman
   
  Windsor II Fund has entered into an investment advisory agreement with
Tukman Capital Management, Inc. (Tukman) to manage a portion of the fund's eq-
uity assets (currently approximately 11%). Under this agreement, Tukman man-
ages the investment and reinvestment of the designated assets and continuously
reviews, supervises, and administers the investment program of the fund with
respect to those assets. Tukman discharges its responsibilities subject to the
control of the Officers and Trustees of the fund.     
 
  Tukman is a Delaware corporation controlled by the following Officers of
Tukman: Melvin T. Tukman, President and Director, and Daniel L. Grossman, Vice
President.
 
  Windsor II Fund pays Tukman a basic fee by applying a quarterly rate, based
on the following annual percentage rates, to the portion of Windsor II's aver-
age month-end assets managed by Tukman:
 
<TABLE>
<CAPTION>
     Net Assets                                                             Rate
     ----------                                                             ----
     <S>                                                                    <C>
     First $25 million..................................................... .40%
     Next $125 million..................................................... .35%
     Next $350 million..................................................... .25%
     Next $500 million..................................................... .20%
     Assets in excess of $1 billion........................................ .15%
</TABLE>
 
  The basic fee paid to Tukman may be increased or decreased by applying an
incentive/penalty fee adjustment based on the 36-month investment performance
of the fund's assets managed by Tukman relative to the investment record of
the Standard & Poor's 500 Composite Stock Price Index
   
  During the fiscal year ended October 31, 1996, 1997, and 1998, Windsor II
Fund incurred advisory fees to Tukman of approximately $2,699,458 before a
performance adjustment of $930,724, $3,622,904 before a performance adjustment
of $785,658, and $5,126,168 before a performance adjustment of $992,760, re-
spectively.     
 
Vanguard's Core Management Group
   
  Vanguard's Core Management Group provides investment advisory services on an
at-cost basis with respect to a portion of Windsor II Fund's assets (currently
approximately 10%). Core Management     
 
                                                                           B-17
<PAGE>
 
   
Group also provides investment advisory services to several other Vanguard
funds. The portion of the fund managed by Core Management Group is not ac-
tively managed, but is instead administered by Core Management Group using
computerized, quantitative techniques based on a value index constructed to
approximate the aggregate fundamental characteristics of a typical large capi-
talization-value fund such as Windsor II Fund. The index is composed of ap-
proximately two hundred and fifty stocks that are chosen through quantitative
analysis of market capitalization, price/earnings ratios, and yield character-
istics which are similar to the stocks that would normally be held in the ac-
tively-managed portions of the fund. Core Management Group is supervised by
the Officers of the Trust.     
   
  During the fiscal years ended October 31, 1996, 1997, and 1998, Windsor II
Fund's share of Vanguard's Advisory expenses totaled approximately $76,056,
$195,588, and $286,977, respectively.     
 
                            VANGUARD EXPLORER FUND
   
  Vanguard Explorer Fund (Explorer) currently employs four investment advis-
ers: Wellington Management Company, LLP (WMC), 75 State Street, Boston, MA
02109; Granahan Investment Management, Inc. (Granahan), 275 Wyman Street, Wal-
tham, MA 02154; Chartwell Investment Partners (Chartwell), 1235 Westlakes
Drive, Suite 330, Berwyn, PA 19312; and Vanguard's Core Management Group. Un-
til February 28, 1990, when Explorer acquired the assets of Explorer II, WMC
was sole investment adviser to Explorer (then known simply as "Explorer
Fund"), and Granahan served as sole investment adviser to Explorer II, the ac-
quired fund.     
 
  The proportion of the net assets of Explorer managed by each adviser is es-
tablished by the Board of Trustees of Explorer, and may be changed in the fu-
ture by the Board of Trustees as circumstances warrant.
 
Wellington Management Company, LLP
   
  Explorer has entered into an advisory agreement with WMC under which WMC
manages the investment and reinvestment of a portion of Explorer's assets and
continuously reviews, supervises, and administers Explorer's investment pro-
gram with respect to those assets. As of October 31, 1998, WMC managed approx-
imately 28% of Explorer's equity investments. WMC discharges its responsibili-
ties subject to the control of the officers and Trustees of Explorer.     
 
  Explorer pays WMC 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 portion of Explorer's average month-end net assets managed by WMC for
the quarter:
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $500 million................................................... .250%
     Next $250 million.................................................... .200%
     Next $250 million.................................................... .150%
     Assets in excess of $1 billion....................................... .100%
</TABLE>
 
  The basic fee paid to WMC may be increased or decreased by applying an
incentive/penalty fee adjustment based on the 36-month investment performance
of the fund's assets managed by WMC relative to the investment performance of
the Russell 2000 Small Stock Index.
 
 
B-18
<PAGE>
 
   
  During the fiscal years ended October 31, 1996, 1997, and 1998, Explorer
Fund paid WMC the following advisory fees:     
 
<TABLE>   
<CAPTION>
                                                1996       1997        1998
                                             ---------- ----------  ----------
     <S>                                     <C>        <C>         <C>
     Basic Fee.............................. $1,922,594 $1,950,387  $1,647,928
     Increase (Decrease) for Performance
      Adjustment............................      6,708    (89,408)   (288,253)
                                             ---------- ----------  ----------
     Total.................................. $1,929,302 $1,860,979  $1,359,675
                                             ========== ==========  ==========
</TABLE>    
 
Granahan Investment Management, Inc.
   
  Granahan Investment Management, Inc. (Granahan) serves as a second invest-
ment adviser to Explorer. Under its advisory agreement, Granahan manages the
investment and reinvestment of a portion of Explorer's assets and continuously
reviews, supervises, and administers Explorer's investment program with re-
spect to those assets. As of October 31, 1998, Granahan managed approximately
47% of Explorer's equity investments. Granahan discharges its responsibilities
subject to the control of the Officers and Trustees of Explorer.     
 
  Granahan is an investment advisory firm specializing in small company stock
investments. Mr. John Granahan is the President and major stockholder of
Granahan Investment Management, Inc.
 
  Explorer pays Granahan a basic fee at the end of each fiscal quarter, calcu-
lated by applying a quarterly rate, based on the following annual percentage
rates, to the portion of Explorer's average month-end net assets managed by
Granahan for the quarter:
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $500 million................................................... .300%
     Next $250 million.................................................... .200%
     Next $250 million.................................................... .150%
     Assets in excess of $1 billion....................................... .100%
</TABLE>
 
  The basic fee paid to Granahan may be increased or decreased by applying an
incentive/penalty fee adjustment based on the investment performance of the
fund's assets managed by Granahan over a trailing thirty-six month period rel-
ative to that of the Russell 2000 Small Stock Index for the same period.
   
  During the fiscal years ended October 31, 1996, 1997, and 1998, Explorer
Fund paid Granahan the following advisory fees:     
 
<TABLE>   
<CAPTION>
                                                1996       1997        1998
                                             ---------- ----------  ----------
     <S>                                     <C>        <C>         <C>
     Basic Fee.............................. $2,389,787 $2,532,966  $2,508,538
     Increase (Decrease) for Performance
      Adjustment............................    386,752   (242,952)   (479,000)
                                             ---------- ----------  ----------
     Total.................................. $2,776,539 $2,290,014  $2,029,538
                                             ========== ==========  ==========
</TABLE>    
 
Chartwell Investment Partners
   
  Explorer has entered into an advisory agreement with Chartwell Investment
Partners (Chartwell) under which Chartwell manages the investment and rein-
vestment of a portion of Explorer's assets and continuously reviews, super-
vises, and administers Explorer's investment program with respect to those as-
sets. As of October 31, 1998, Chartwell managed approximately 10% of
Explorer's equity investments. Chartwell discharges its responsibilities sub-
ject to the control of the Officers and Trustees of the Fund.     
 
                                                                           B-19
<PAGE>
 
   
  Chartwell is an employee-owned investment partnership providing equity and
fixed income management. Edward N. Antoian, one of the firm's partners, is the
portfolio manager for their small-capitalization growth products.     
 
  For the services provided by Chartwell under the advisory agreement, Ex-
plorer will pay Chartwell a basic fee at the end of each fiscal quarter, cal-
culated by applying a quarterly rate, based on the following annual percentage
rates, to the average month-end net assets of Explorer managed by Chartwell
for the quarter:
 
<TABLE>
<CAPTION>
   Net Assets                                                              Rate
   ----------                                                              ----
   <S>                                                                     <C>
   First $250 million..................................................... 0.40%
   Next $250 million...................................................... 0.30%
   Assets in excess of $500 million....................................... 0.20%
</TABLE>
   
  Effective with the quarter ended July 31, 1998, the basic fee, as provided
above, shall be increased or decreased by applying an incentive/penalty fee
adjustment based on the 36-month investment performance of the assets of Ex-
plorer managed by Chartwell relative to the investment performance of the
Small Company Growth Fund Stock Index, which is made up of stocks held by the
nation's 25 largest small company funds.     
 
  For the period August 1, 1997 to October 31, 1997, and the fiscal year ended
October 31, 1998, Explorer paid Chartwell the following advisory fees:
 
<TABLE>   
<CAPTION>
                                                            August 1-
                                                           October 31,
                                                              1997       1998
                                                           ----------- --------
<S>                                                        <C>         <C>
Basis Fee.................................................  $202,329   $952,259
Increase (Decrease) for Performance Adjustment............         0    (71,146)
                                                            --------   --------
  Total...................................................  $202,329   $881,113
                                                            ========   ========
</TABLE>    
 
The Vanguard Group, Inc.
   
  Vanguard's Core Management Group provides investment advisory services on an
at-cost basis with respect to 15% of Vanguard Explorer Fund's assets. Core
Management Group employs a quantitative investment approach that uses computer
techniques to track--and, if possible, outperform the Small Company Growth
Fund Stock Index.     
   
  For the period August 1, 1997 to October 31, 1997, and the fiscal year ended
October 31, 1998, Explorer's share of Vanguard's advisory expenses totaled ap-
proximately $1,318, and $39,000, respectively.     
 
B-20
<PAGE>
 
                        VANGUARD U.S. GROWTH PORTFOLIO
 
Lincoln Capital Management Company
   
  Vanguard World Fund entered into an investment advisory agreement with Lin-
coln Capital Management Company (Lincoln) under which Lincoln manages the in-
vestment and reinvestment of the assets included in Vanguard U.S. Growth Fund
and continuously reviews, supervises, and administers the fund. Lincoln will
invest or reinvest such assets primarily in U.S. securities. Lincoln dis-
charges its responsibilities subject to the control of the Officers and Trust-
ees of the fund. Under this agreement the fund pays Lincoln an advisory 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:     
 
<TABLE>
<CAPTION>
     Net Assets                                                             Rate
     ----------                                                             ----
     <S>                                                                    <C>
     First $25 million..................................................... .40%
     Next $125 million..................................................... .35%
     Next $350 million..................................................... .25%
     Next $500 million..................................................... .20%
     Next $1.5 billion..................................................... .15%
     Next $12.5 billion.................................................... .10%
     Assets in excess of $15 billion....................................... .08%
</TABLE>
 
  Lincoln is an Illinois corporation in which a controlling interest is held
by the following persons: Timothy H. Ubben, Chairman; J. Parker Hall III,
Chief Executive Officer; Kenneth R. Meyer, President; Ray B. Zemon, Executive
Vice President; David M. Fowler, Executive Vice President; Richard W. Knee,
Executive Vice President; and Jay H. Freedman, Executive Vice President.
 
  For the fiscal years ended August 31, 1996, 1997, and 1998, the fund in-
curred advisory fees of $6,139,000, $8,475,000, and $11,377,000, respectively.
 
                                                                           B-21
<PAGE>
 
                            VANGUARD PRIMECAP FUND
 
PRIMECAP Management Company
   
  Vanguard PRIMECAP Fund (PRIMECAP) employs PRIMECAP Management Company (the
Adviser) under an investment advisory agreement to manage the investment and
reinvestment of the assets of PRIMECAP and to continuously review, supervise,
and administer PRIMECAP Fund's investment program. The Adviser discharges its
responsibilities subject to the control of the Officers and Trustees of the
fund.     
 
  The Adviser is a California corporation whose outstanding shares are owned
by its directors and officers. The directors of the corporation and the of-
fices they currently hold are: Howard Bernard Schow, Chairman; Mitchell John
Milias, Vice Chairman and Treasurer; Theofanis Anastasios Kolokotrones, Presi-
dent and Secretary; and Joel P. Fried, Senior Vice President.
 
  PRIMECAP pays the Adviser an advisory fee at the end of each fiscal quarter,
calculated by applying a quarterly rate, based on the following annual per-
centage rates, to the Fund's average month-end net assets for the quarter:
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                           ------
     <S>                                                                  <C>
     First $50 million................................................... 0.500%
     Next $200 million................................................... 0.450%
     Next $250 million................................................... 0.375%
     Next $1,750 million................................................. 0.250%
     Next $2,750 million................................................. 0.200%
     Next $5 billion..................................................... 0.175%
     Assets in excess of $10 billion..................................... 0.150%
</TABLE>
   
  During the fiscal years ended December 31, 1996, 1997, and 1998, PRIMECAP
incurred investment advisory fees of approximately $10,439,000, $14,455,000,
and $20,669,000, respectively.     
 
                       VANGUARD PRIME MONEY MARKET FUND
 
  Vanguard's Fixed Income Group provides investment advisory services on an
at-cost basis to Vanguard Prime Money Market Fund.
   
  During the fiscal years ended November 30, 1996, 1997, and 1998, Vanguard
Prime Money Market Fund's share of Vanguard's advisory expenses totaled ap-
proximately $2,557,000, $3,782,000, and $3,811,000, respectively.     
 
B-22
<PAGE>
 
                        VANGUARD ASSET ALLOCATION FUND
   
  Vanguard Asset Allocation Fund (VAAF) employs Mellon Capital Management Cor-
poration (MCM), 595 Market St., 30th Floor, San Francisco, California, 94105,
under an investment advisory agreement to manage the investment and reinvest-
ment of the assets of VAAF and to continuously review, supervise and adminis-
ter the VAAF's investment program. MCM discharges its responsibilities subject
to the control of the Officers and Trustees of VAAF.     
   
  VAAF pays MCM a basic fee at the end of each fiscal quarter, calculated by
applying a quarterly rate, based on the following annual percentage rates, to
VAAF's average month-end net assets for the quarter:     
 
<TABLE>
<CAPTION>
     Net Assets                                                            Rate
     ----------                                                            -----
     <S>                                                                   <C>
     First $100 million................................................... .200%
     Next $900 million.................................................... .150%
     Next $500 million.................................................... .125%
     Assets in excess of $1.5 billion..................................... .100%
</TABLE>
 
  This fee may be increased or decreased by applying an adjustment formula
based on the cumulative investment performance of the Fund's portfolio for the
thirty-six months preceeding the end of the quarter relative to the investment
record of a Combined Index for the same period. The Combined Index is com-
prised of the Standard & Poor's 500 Composite Price Index (65% of the Combined
Index) and the Lehman Brothers Long-Term U.S. Treasury Index (35% of the Com-
bined Index).
   
  For the fiscal years ended September 30, 1996, 1997, and 1998, VAAF paid MCM
approximately $2,691,000 (before a decrease of $515,000 based on performance),
$3,723,000 (before a decrease of $921,000 based on performance), and
$5,466,000 (before a decrease of $1,404,000 based on performance), respective-
ly.     
 
              VANGUARD TOTAL STOCK MARKET INDEX FUNDAND VANGUARD
                     TOTAL INTERNATIONAL STOCK INDEX FUND
 
  Vanguard Total Stock Market Index Fund receives its investment advisory
services on an at-cost basis from Vanguard's Core Management Group. Vanguard
Total International Stock Index Fund does not employ an investment adviser and
therefore does not pay advisory fees. However, the Fund, as a shareholder to
the underlying funds, benefits from the investment advisory services provided
by Core Management Group to the underlying funds in which the Fund invests.
   
  During the fiscal years ended December 31, 1996, 1997, and 1998, Total Stock
Market Index Fund's share of Vanguard's advisory expenses totaled $27,000,
$56,000, and $82,000, respectively.     
 
                            PORTFOLIO TRANSACTIONS
 
  Each Fund will purchase and sell the principal portion of its Fund securi-
ties (i.e., shares of the underlying Vanguard funds) by dealing directly with
the issuer--the underlying funds. As such, the Funds incur no brokerage com-
missions.
 
                                                                           B-23
<PAGE>
 
                              PURCHASE OF SHARES
 
  The purchase price of shares of the Trust's Funds is the net asset value
next determined after the order is received. The net asset value is calculated
as of the close of the New York Stock Exchange (generally 4 p.m. Eastern time)
on each day the Exchange is open for business and on any other day on which
there is sufficient trading in each Fund's underlying securities to materially
affect its net asset value per share. An order received prior to the close of
the Exchange will be executed at the price computed on the date of receipt;
and an order received after the close of the Exchange will be executed at the
price computed on the next day the Exchange is open.
 
  The Trust reserves the right in its sole discretion (i) to suspend the of-
fering of its shares, (ii) to reject purchase orders when in the judgment of
management such rejection is in the best interest of the Trust, and (iii) to
reduce or waive the minimum investment for or any other restrictions on ini-
tial and subsequent investments for certain fiduciary accounts such as em-
ployee benefit plans or under circumstances where certain economies can be
achieved in sales of Funds' shares.
 
  To assure that the Trust continues to operate in the manner set forth in
this Prospectus, including the desired composition of shareholder investments
in the Trust, the Officers of the Trust will monitor and report to the Trust-
ees the composition of the Trust's shareholder base. The Trust's shares will
be marketed to tax-advantaged and other retirement accounts. The Officers will
recommend to the Trustees any action they deem necessary to assure that in-
vestments in the Trust do not become inconsistent with the policies applicable
to the Trust. This could include recommendations to limit sales to specific
categories of investors or to revise the suitability standards for investors.
   
  A 0.50% portfolio transaction fee is deducted from purchases of Total Inter-
national Stock Index Fund, including any purchases made by the Vanguard
LifeStrategy Funds. Portfolio transaction fees are retained by the Fund in or-
der to offset transaction costs of buying international securities in the Van-
guard European, Pacific, and Emerging Markets Stock Index Funds. The fee is
not a sales charge.     
 
                             REDEMPTION OF SHARES
   
  The Trust 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 rea-
sonably practicable for STAR 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 Trust has authorized Charles Schwab & Co., Inc. (Schwab) to accept on
its behalf purchase and redemption orders under certain terms and conditions.
Schwab is also authorized to designate other intermediaries to accept purchase
and redemption orders on the Trust's behalf subject to those terms and condi-
tions. Under this arrangement, the Trust will be deemed to have received a
purchase or redemption order when Schwab or, if applicable, Schwab's autho-
rized designee, accepts the order in accordance with the Trust's instructions.
Customer orders that are properly transmitted to the Trust by Schwab, or if
applicable, Schwab's authorized designee, will be priced as follows:     
 
  Orders received by Schwab before 3 p.m. Eastern time on any business day,
will be sent to Vanguard that day and your share price will be based on the
Fund's net asset value calculated at the close of trading that day. Orders re-
ceived by Schwab after 3 p.m. Eastern time, will be sent to Vanguard on the
following business day and your share price will be based on the Fund's net
asset value calculated at the close of trading that day.
 
 
B-24
<PAGE>
 
                                  SHARE PRICE
 
  Each Fund's share price, or "net asset value" per share, is calculated by
dividing the total assets of the Fund, less all liabilities, by the total num-
ber 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. This determination is made by apprais-
ing each Fund's underlying investment (i.e., the underlying Vanguard funds) at
the price of each such fund determined at the close of the Exchange.
 
  The share price for each Fund can be found daily in the mutual fund listings
of most major newspapers under the heading of Vanguard Funds.
 
                            YIELD AND TOTAL RETURN
   
  The yield of STAR Fund for the 30-day period ended December 31, 1998 was
3.06%. The yield of the LifeStrategy Income, Conservative Growth, Moderate
Growth, and Growth Funds for the 30-day period ended December 31, 1998 was
5.01%, 4.08%, 3.13%, and 2.21%, respectively.     
 
SEC Yield
 
  Yield is the net annualized yield based on a specific 30-day (or one month)
period assuming semiannual compounding of income. Yield is calculated by di-
viding the net investment income per share earned during the period by the
maximum offering price per share on the last day of the period, according to
the following formula:
 
                         YIELD = 2[((a-b)/cd+1)/6/-1]
 
  Where:
     a=   dividends and interest earned during the period
     b=   expenses accrued for the period (net of reimbursements)
     c=   the average daily number of shares outstanding during the period
          that were entitled to receive dividends
     d=   the maximum offering price per share on the last day of the period
   
  The average annual total return of STAR Fund for the one-, five-, and ten-
year periods ended December 31, 1998 was 12.38%, 15.20%, and 13.46%, respec-
tively. The average annual total return of LifeStrategy Income Fund for the
one-year period ended December 31, 1998 and since its inception on September
30, 1994 was 13.17% and 13.53%. The average annual total return of
LifeStrategy Conservative Growth Fund for the one-year period ended December
31, 1998 and since its inception on September 30, 1994 was 15.88% and 15.70%.
The average annual total return of LifeStrategy Moderate Growth Fund for the
one-year period ended December 31, 1998 and since its inception on September
30, 1994 was 19.03% and 18.27%. The average annual total return of
LifeStrategy Growth Fund for the one-year period ended December 31, 1998 and
since its inception on September 30, 1994 was 21.40% and 20.52%. The average
annual total return of Total International Stock Index Fund for the one year
period ended December 31, 1998 and since its inception on April 29, 1996 was
15.02% and 5.29%.     
 
                                                                           B-25
<PAGE>
 
Average Annual Total Return
 
  Average annual total return is the average annual compounded rate of return
for the periods of one year, five years, ten years or the life of the fund,
all ended on the last day of a recent month. Average annual total return quo-
tations will reflect changes in the price of the fund's shares and assume that
all dividends and capital gains distributions during the respective periods
were reinvested in fund shares. Average annual total return is calculated by
finding the average annual compounded rates of return of a hypothetical in-
vestment over such periods according to the following formula (average annual
total return is then expressed as a percentage):
 
                              T = (ERV/P)/1/n/-1
 
  Where:
     T=     average annual total return
     P=     a hypothetical initial investment of $1,000
     n=     number of years
     ERV=   ending redeemable value: ERV is the value, at the end of the
            applicable period, of a hypothetical $1,000 investment made at
            the beginning of the applicable period
 
Cumulative Total Return
 
  Cumulative total return is the cumulative rate of return on a hypothetical
initial investment of $1,000 for a specified period. Cumulative total return
quotations reflect changes in the price of the fund's shares and assume that
all dividends and capital gains distributions during the period were rein-
vested in fund shares. Cumulative total return is calculated by finding the
cumulative rates of a return of a hypothetical investment over such periods,
according to the following formula (cumulative total return is then expressed
as a percentage):
 
                                 C = (ERV/P)-1
  Where:
     C=     cumulative total return
     P=     a hypothetical initial investment of $1,000
     ERV=   ending redeemable value: ERV is the value, at the end of the
            applicable period, of a hypothetical $1,000 investment made at
            the beginning of the applicable period
 
                              COMPARATIVE INDEXES
 
  Vanguard may use reprinted material discussing The Vanguard Group, Inc. or
any of the member trusts of The Vanguard Group of Investment Companies.
 
  Each of the investment company members of The Vanguard Group may from time
to time use one or more of the following unmanaged indexes for comparative
performance purposes.
 
Growth Fund Stock Index--The Index is composed of the various common stocks
that are held in the 50 largest growth stock mutual funds, using year-end as-
sets, monitored by Morningstar, Inc. Under an agreement with Vanguard Morgan
Growth Fund, Morningstar, Inc. develops the composition of the Index and its
total return each quarter. Neither The Vanguard Group, Inc., nor its advisers
are affiliated with Morningstar in any way.
   
Standard and Poor's 500 Composite Stock Price Index--includes stocks selected
by Standard & Poor's Index Committee to include leading companies in leading
industries and to reflect the U.S. stock market.     
   
Standard and Poor's 500/BARRA Value Index--consists of the stocks in the Stan-
dard and Poor's 500 Composite Stock Price Index (S&P 500) with the lowest
price-to-book ratios, comprising 50% of the market capitalization of the S&P
500.     
 
B-26
<PAGE>
 
Standard & Poor's MidCap 400 Index--is composed of 400 medium sized domestic
stocks.
 
Standard & Poor's SmallCap 600/BARRA Value Index--contains stocks of the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.
 
Standard & Poor's SmallCap 600/BARRA 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 more than 7,000 common equity securi-
ties, 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.
 
Morgan Stanley Capital International EAFE Index--is an arithmetic, market val-
ue-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia, Asia and the Far East.
 
MSCI EMF Index--an arithmetic, market value-weighted average of the perfor-
mance of securities listed on the stock exchanges of twenty-two developing
countries.
 
MSCI EAFE + Select EMF Index--an arithmetic, market value-weighted average of
the performance of securities listed on the stock markets of Europe, Austra-
lia, the Far East and fourteen developing countries.
 
Goldman Sachs 100 Convertible Bond Index--currently includes 71 bonds and 29
preferreds. The original list of names was generated by screening for convert-
ible 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 Mort-
gage 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 Long-Term Treasury Bond Index--is a market weighted index that contains
individually priced U.S. Treasury securities with maturities of 10 years or
greater.     
 
Merrill Lynch Corporate & Government Bond Index--consists of over 4,000 U.S.
Treasury, Agency and investment grade corporate bonds.
   
Lehman Corporate (Baa) Bond Index--all publicly offered, fixed-rate, noncon-
vertible 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 1,500 issues.     
 
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, non-callable 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-27
<PAGE>
 
Composite Index--70% Standard & Poor's 500 Index and 30% NASDAQ Industrial In-
dex.
 
Composite Index--65% Standard & Poor's 500 Index and 35% Lehman Long-Term Cor-
porate 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.
   
Lehman Brothers Aggregate Bond Index--is a market weighted index that contains
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 $5 trillion.     
 
Lehman Brothers Mutual Fund Short (1-5) Government/Corporate Index--is a mar-
ket weighted index that contains 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 individually priced U.S. Treasury, agen-
cy, and corporate securities rated BBB- or better with maturities between 5
and 10 years. The index has a market value of over $800 billion.     
   
Lehman Brothers Long (10+) Government/Corporate Index--is a market weighted
index that contains individually priced U.S. Treasury, agency, and corporate
securities rated BBB- or better with maturities greater than 10 years. The in-
dex has a market value of over $1.1 trillion.     
 
Russell 2000 Stock Index--consists of the smallest 2,000 stocks within the
Russell 3000; a widely-used benchmark for small capitalization common stocks.
 
Ibbotson Associates Yearbook--various mutual fund performance data.
   
Lipper Balanced Fund Average--An industry benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper Inc.
       
Lipper Non-Government Money Market Fund Average--An industry benchmark of av-
erage non-government money market funds with similar investment objectives and
policies, as measured by Lipper Inc.     
   
Lipper Government Money Market Fund Average--An industry benchmark of average
government money market funds with similar investment objectives and policies,
as measured by Lipper Inc.     
   
Lipper Small Cap Fund Average--the average performance of small company growth
funds as defined by Lipper Inc. Lipper defines a small company growth fund as
a fund that by prospectus or portfolio practice, limits its investments to
companies on the basis of the size of the company. From time to time, Vanguard
may advertise using the average performance and/or the average expense ratio
of the small company growth funds. (This fund category was first established
in 1982. For years prior to 1982, the results of the Lipper Small Company
Growth category were estimated using the returns of the Funds that constituted
the Group at its inception.)     
 
Russell 3000 Index--consists of approximately the 3,000 largest stocks of U.S.
domiciled companies commonly traded on the New York and American Stock Ex-
changes or the NASDAQ over-the-counter market, accounting for over 90% of the
market value of publicly traded Stocks in the U.S.
 
B-28
<PAGE>
 
                              FINANCIAL STATEMENTS
 
  The Funds' financial statements for the year ended December 31, 1998, appear-
ing in the Funds' 1998 Annual Reports to Shareholders and the reports thereon
of PricewaterhouseCoopers LLP, independent accountants, also appearing therein,
are incorporated by reference in this Statement of Additional Information. For
a more complete discussion of the performance, please see the Funds' Annual Re-
ports to Shareholders, which may be obtained without charge.
 
                                                                            B-29
<PAGE>
 
                                    PART C
 
                              VANGUARD STAR FUND
 
                               OTHER INFORMATION
 
Item 23. Exhibits
 
<TABLE>   
<CAPTION>
 Exhibit
 Number  Description
 ------- -----------
 <C>     <S>
 (a)     Declaration of Trust*
 (b)     By-Laws*
 (c)     Reference is made to Articles III and V of the Registrant's
         Declaration of Trust
 (d)     Not Applicable
 (e)     Not Applicable
 (f)     Reference is made to the section entitled "Management of the Trust" in
         the Registrant's Statement of Additional Information
 (g)     Custodian Agreement*
 (h)     Special Servicing Agreement*
 (i)     Legal Opinion*
 (j)     Consent of Independent Accountants+
 (k)     Not Applicable
 (l)     Not Applicable
 (m)     Not Applicable
 (n)     Financial Data Schedule+
 (o)     Not Applicable
</TABLE>    
- --------
 *Filed Previously.
       
 +Filed Herewith.
 
Item 24. Persons Controlled by or under Common Control with Registrant
 
  Registrant is not controlled by or under common control with any person.
 
Item 25. Indemnification
 
  The Registrant's organizational documents contain provisions indemnifying
Trustees and Officers against liability incurred in their official capacity.
Article VII, Section 2 of the Declaration of Trust provides that the Regis-
trant may indemnify and hold harmless each and every Trustee and Officer from
and against any and all claims, demands, costs, losses, expenses, and damages
whatsoever arising out of or related to the performance of his or her duties
as a Trustee or Officer. However, this provision does not cover any liability
to which a Trustee or Officer would otherwise be subject by reason of willful
misfeasance, bad faith, gross negligence, or reckless disregard of the duties
involved in the conduct of his or her office. Article VI of the By-Laws gener-
ally provides that the Registrant shall indemnify its Trustees and Officers
from any liability arising out of their past or present service in that capac-
ity. Among other things, this provision excludes any liability arising by rea-
son of willful misfeasance, bad faith, gross negligence, or the reckless dis-
regard of the duties involved in the conduct of the Trustee's or Officer's
office with the Registrant.
 
Item 26. Business and Other Connections of the Investment Adviser
 
  The Trust has no Investment Adviser.
 
                                                                            C-1
<PAGE>
 
Item 27. Principal Underwriters
 
  (a) Not Applicable
  (b) Not Applicable
  (c) Not Applicable
 
Item 28. Location of Accounts and Records
 
  The books, accounts, and other documents required by Section 31(a) under the
Investment Company Act and the rules thereunder will be maintained at the of-
fices of the Registrant; Registrant's Transfer Agent, The Vanguard Group, Inc.
Valley Forge, Pennsylvania 19482; and the Registrant's Custodian, First Union
National Bank, Philadelphia, Pennsylvania 19106 and The Chase Manhattan Bank,
Brooklyn, NY 11245.
 
Item 29. Management Services
 
  Other than as set forth under the description of The Vanguard Group in Part
B of this Registration Statement, Registrant is not a party of any management-
related service contract.
 
Item 30. Undertakings
 
  Not Applicable
 
C-2
<PAGE>
 
                                  SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933 and the Invest-
ment Company Act of 1940, the Registrant certifies that it meets all the re-
quirements for effectiveness of this Registration Statement pursuant to Rule
485(b) under the Securities Act of 1933 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly autho-
rized, in the Town of Valley Forge and the Commonwealth of Pennsylvania, on
the 29th day of April, 1999.     
 
                                          Vanguard Star Funds
 
                                                        Heidi Stam
                                          By:__________________________________
                                               John J. Brennan*,Chairman and
                                                  Chief Executive Officer
 
  Pursuant to the requirements of the Securities Act of 1933, this Post-Effec-
tive Amendment to the Registration Statement has been signed below by the fol-
lowing persons in the capacities and on the date indicated:
 
             Signatures                        Title                 Date
 
             Heidi Stam                Senior Chairman of          
By: _________________________________   the Board and           April 29, 1999
           John C. Bogle*               Trustee                          
 
             Heidi Stam                Chairman, Trustee           
By: _________________________________   and Chief Executive     April 29, 1999
          John J. Brennan*              Officer                          
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
       JoAnn Heffernan Heisen*                                           
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
         Bruce K. MacLaury*                                              
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
       Burton G. Malkiel, Jr.*                                           
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
       Alfred M. Rankin, Jr.*                                            
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
          John C. Sawhill*                                               
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
        James O. Welch, Jr.*                                             
 
             Heidi Stam                Trustee                     
By: _________________________________                           April 29, 1999
         J. Lawrence Wilson*                                             
 
             Heidi Stam                Treasurer and               
By: _________________________________   Principal Financial     April 29, 1999
         Thomas J. Higgins*             Officer and                      
                                        Accounting Officer
 
* By Power of Attorney. See File Number 33-4424, January 25, 1999. Incorpo-
rated by Reference.
 
                                                                            C-3
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>   
<S>                                                                     <C>
Consent of Independent Accountants..................................... EX-99.BJ
Financial Data Schedule................................................ EX-99.BN
</TABLE>    

<PAGE>
 
                                                                       EX-99.BJ
 
                      CONSENT OF INDEPENDENT ACCOUNTANTS
   
  We hereby consent to the incorporation by reference in the Prospectuses and
Statement of Additional Information constituting parts of this Post-Effective
Amendment No. 23 to the registration statement on Form N-1A (the "Registration
Statement") of our reports dated February 2, 1999, relating to the financial
statements and financial highlights appearing in the December 31, 1998 Annual
Reports to Shareholders of Vanguard STAR Fund, Vanguard LifeStrategy Funds,
and Vanguard Total International Stock Index Fund, which are also incorporated
by reference into the Registration Statement. We also consent to the refer-
ences to us under the heading "Financial Highlights" in the Prospectuses and
under the headings "Financial Statements" and "Service Providers--Independent
Accountants" in the Statements of Additional Information.     
 
PricewaterhouseCoopers LLP
 
Philadelphia, PA
   
April 22, 1999     

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 01
   [NAME] VANGUARD STAR FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                        6,258,704
[INVESTMENTS-AT-VALUE]                       8,107,719
[RECEIVABLES]                                   25,301
[ASSETS-OTHER]                                       0
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               8,133,020
[PAYABLE-FOR-SECURITIES]                        14,343
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                       36,051
[TOTAL-LIABILITIES]                             50,394
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     6,233,825
[SHARES-COMMON-STOCK]                          450,027
[SHARES-COMMON-PRIOR]                          423,326
[ACCUMULATED-NII-CURRENT]                        1,026
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                         1,240
[ACCUM-APPREC-OR-DEPREC]                     1,849,015
[NET-ASSETS]                                 8,082,626
[DIVIDEND-INCOME]                              247,247
[INTEREST-INCOME]                                  136
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                        247,383
[REALIZED-GAINS-CURRENT]                       412,556
[APPREC-INCREASE-CURRENT]                      239,881
[NET-CHANGE-FROM-OPS]                          899,820
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                      246,270
[DISTRIBUTIONS-OF-GAINS]                       412,420
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         52,426
[NUMBER-OF-SHARES-REDEEMED]                     61,339
[SHARES-REINVESTED]                             35,613
[NET-CHANGE-IN-ASSETS]                         727,247
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                             87
[OVERDIST-NET-GAINS-PRIOR]                       1,376
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                         7,789,526
[PER-SHARE-NAV-BEGIN]                            17.38
[PER-SHARE-NII]                                   0.58
[PER-SHARE-GAIN-APPREC]                           1.56
[PER-SHARE-DIVIDEND]                              0.58
[PER-SHARE-DISTRIBUTIONS]                         0.98
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              17.96
[EXPENSE-RATIO]                                      0
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 02
   [NAME] VANGUARD LIFESTRATEGY INCOME FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                          417,578
[INVESTMENTS-AT-VALUE]                         454,105
[RECEIVABLES]                                    2,986
[ASSETS-OTHER]                                       0
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                                 457,091
[PAYABLE-FOR-SECURITIES]                         3,296
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                        4,898
[TOTAL-LIABILITIES]                              8,194
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                       412,498
[SHARES-COMMON-STOCK]                           33,948
[SHARES-COMMON-PRIOR]                           19,621
[ACCUMULATED-NII-CURRENT]                           37
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                           165
[ACCUM-APPREC-OR-DEPREC]                        36,527
[NET-ASSETS]                                   448,897
[DIVIDEND-INCOME]                               18,082
[INTEREST-INCOME]                                   32
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                         18,114
[REALIZED-GAINS-CURRENT]                         6,230
[APPREC-INCREASE-CURRENT]                       19,239
[NET-CHANGE-FROM-OPS]                           43,583
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       18,129
[DISTRIBUTIONS-OF-GAINS]                         6,279
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         21,063
[NUMBER-OF-SHARES-REDEEMED]                      8,368
[SHARES-REINVESTED]                              1,632
[NET-CHANGE-IN-ASSETS]                         204,959
[ACCUMULATED-NII-PRIOR]                             52
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                         116
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                           345,408
[PER-SHARE-NAV-BEGIN]                            12.43
[PER-SHARE-NII]                                   0.63
[PER-SHARE-GAIN-APPREC]                           0.98
[PER-SHARE-DIVIDEND]                              0.63
[PER-SHARE-DISTRIBUTIONS]                         0.19
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              13.22
[EXPENSE-RATIO]                                   0.00
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 03
   [NAME] VANGUARD LIFESTRATEGY CONSERVATIVE GROWTH FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                        1,232,884
[INVESTMENTS-AT-VALUE]                       1,416,574
[RECEIVABLES]                                   10,136
[ASSETS-OTHER]                                       0
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               1,426,710
[PAYABLE-FOR-SECURITIES]                         5,145
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                        5,856
[TOTAL-LIABILITIES]                             11,001
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     1,232,692
[SHARES-COMMON-STOCK]                           96,215
[SHARES-COMMON-PRIOR]                           59,939
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                             602
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                            71
[ACCUM-APPREC-OR-DEPREC]                       183,690
[NET-ASSETS]                                 1,415,709
[DIVIDEND-INCOME]                               47,728
[INTEREST-INCOME]                                   54
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                         47,782
[REALIZED-GAINS-CURRENT]                        18,699
[APPREC-INCREASE-CURRENT]                       97,520
[NET-CHANGE-FROM-OPS]                          164,001
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       48,539
[DISTRIBUTIONS-OF-GAINS]                        18,656
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         50,880
[NUMBER-OF-SHARES-REDEEMED]                     19,020
[SHARES-REINVESTED]                              4,416
[NET-CHANGE-IN-ASSETS]                         612,760
[ACCUMULATED-NII-PRIOR]                            155
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                         114
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                         1,106,196
[PER-SHARE-NAV-BEGIN]                            13.40
[PER-SHARE-NII]                                   0.58
[PER-SHARE-GAIN-APPREC]                           1.52
[PER-SHARE-DIVIDEND]                              0.59
[PER-SHARE-DISTRIBUTIONS]                         0.20
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              14.71
[EXPENSE-RATIO]                                   0.00
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 04
   [NAME] VANGUARD LIFESTRATEGY MODERATE GROWTH FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                        1,796,275
[INVESTMENTS-AT-VALUE]                       2,201,993
[RECEIVABLES]                                   12,750
[ASSETS-OTHER]                                   2,381
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               2,217,124
[PAYABLE-FOR-SECURITIES]                         5,562
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                        9,618
[TOTAL-LIABILITIES]                             15,180
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     1,797,077
[SHARES-COMMON-STOCK]                          130,620
[SHARES-COMMON-PRIOR]                           91,708
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                             419
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                           432
[ACCUM-APPREC-OR-DEPREC]                       405,718
[NET-ASSETS]                                 2,201,944
[DIVIDEND-INCOME]                               61,225
[INTEREST-INCOME]                                  109
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                         61,334
[REALIZED-GAINS-CURRENT]                        30,755
[APPREC-INCREASE-CURRENT]                      220,429
[NET-CHANGE-FROM-OPS]                          312,518
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       61,591
[DISTRIBUTIONS-OF-GAINS]                        30,946
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         55,074
[NUMBER-OF-SHARES-REDEEMED]                     21,344
[SHARES-REINVESTED]                              5,182
[NET-CHANGE-IN-ASSETS]                         843,935
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                            162
[OVERDIST-NET-GAINS-PRIOR]                         241
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                         1,789,607
[PER-SHARE-NAV-BEGIN]                            14.81
[PER-SHARE-NII]                                   0.51
[PER-SHARE-GAIN-APPREC]                          2.295
[PER-SHARE-DIVIDEND]                              0.51
[PER-SHARE-DISTRIBUTIONS]                        0.245
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              16.86
[EXPENSE-RATIO]                                   0.00
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 05
   [NAME] VANGUARD LIFESTRATEGY GROWTH FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                        1,501,564
[INVESTMENTS-AT-VALUE]                       1,926,826
[RECEIVABLES]                                    8,131
[ASSETS-OTHER]                                     697
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               1,935,654
[PAYABLE-FOR-SECURITIES]                         1,613
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                        9,919
[TOTAL-LIABILITIES]                             11,532
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     1,499,575
[SHARES-COMMON-STOCK]                          102,379
[SHARES-COMMON-PRIOR]                           73,811
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                             482
[ACCUMULATED-NET-GAINS]                              0
[OVERDISTRIBUTION-GAINS]                           233
[ACCUM-APPREC-OR-DEPREC]                       425,262
[NET-ASSETS]                                 1,924,122
[DIVIDEND-INCOME]                               38,967
[INTEREST-INCOME]                                   87
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                         39,054
[REALIZED-GAINS-CURRENT]                        26,190
[APPREC-INCREASE-CURRENT]                      233,545
[NET-CHANGE-FROM-OPS]                          298,789
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       39,473
[DISTRIBUTIONS-OF-GAINS]                        26,309
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         40,609
[NUMBER-OF-SHARES-REDEEMED]                     15,501
[SHARES-REINVESTED]                              3,460
[NET-CHANGE-IN-ASSETS]                         740,405
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                            0
[OVERDISTRIB-NII-PRIOR]                             63
[OVERDIST-NET-GAINS-PRIOR]                         114
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                         1,543,240
[PER-SHARE-NAV-BEGIN]                            16.04
[PER-SHARE-NII]                                   0.41
[PER-SHARE-GAIN-APPREC]                          3.015
[PER-SHARE-DIVIDEND]                              0.41
[PER-SHARE-DISTRIBUTIONS]                        0.265
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              18.79
[EXPENSE-RATIO]                                   0.00
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000736054
[NAME] VANGUARD STAR FUNDS
[SERIES]
   [NUMBER] 06
   [NAME] VANGUARD TOTAL INTERNATIONAL STOCK INDEX FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   YEAR
[FISCAL-YEAR-END]                          DEC-31-1998
[PERIOD-START]                             JAN-01-1998
[PERIOD-END]                               DEC-31-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                        1,285,326
[INVESTMENTS-AT-VALUE]                       1,378,137
[RECEIVABLES]                                    4,471
[ASSETS-OTHER]                                       0 
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                               1,382,608
[PAYABLE-FOR-SECURITIES]                         5,370
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                        1,756
[TOTAL-LIABILITIES]                              7,126
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                     1,282,238
[SHARES-COMMON-STOCK]                          122,950
[SHARES-COMMON-PRIOR]                           91,519
[ACCUMULATED-NII-CURRENT]                            0
[OVERDISTRIBUTION-NII]                             440
[ACCUMULATED-NET-GAINS]                            873
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                        92,811
[NET-ASSETS]                                 1,375,482
[DIVIDEND-INCOME]                               24,758
[INTEREST-INCOME]                                  184
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                       0
[NET-INVESTMENT-INCOME]                         24,942
[REALIZED-GAINS-CURRENT]                         2,035
[APPREC-INCREASE-CURRENT]                      134,333
[NET-CHANGE-FROM-OPS]                          161,310
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       25,233
[DISTRIBUTIONS-OF-GAINS]                         1,202
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                         44,998
[NUMBER-OF-SHARES-REDEEMED]                     15,789
[SHARES-REINVESTED]                              2,221
[NET-CHANGE-IN-ASSETS]                         472,500
[ACCUMULATED-NII-PRIOR]                              0
[ACCUMULATED-GAINS-PRIOR]                           40
[OVERDISTRIB-NII-PRIOR]                            149
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                                0
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                      0
[AVERAGE-NET-ASSETS]                         1,145,163
[PER-SHARE-NAV-BEGIN]                             9.87
[PER-SHARE-NII]                                   0.21
[PER-SHARE-GAIN-APPREC]                           1.33
[PER-SHARE-DIVIDEND]                              0.21
[PER-SHARE-DISTRIBUTIONS]                         0.01
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              11.19
[EXPENSE-RATIO]                                      0
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>


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