Exhibit 17(d)

SUBJECT TO COMPLETION
PRELIMINARY PROSPECTUS
DATED MARCH 15, 2002        VANGUARD(R) MID-CAP GROWTH FUND

                            INVESTOR SHARES * *, 2002

This  prospectus  contains  financial  data for the Fund through the fiscal year
ended October 31, 2001.

PROSPECTUS                                                                 STOCK
                                    [GRAPHIC]

Information  contained in this prospectus is subject to completion or amendment.
A  registration  statement for Vanguard  Mid-Cap Growth Fund has been filed with
the U.S.  Securities and Exchange  Commission but has not yet become  effective.
This new fund is being formed in connection with the proposed  reorganization of
an existing  fund,  known as Provident  Mid Cap Growth Fund A.  Shareholders  of
Provident  Mid Cap  Growth  Fund A may or may  not  approve  the  reorganization
proposal.   If  the  proposal  is  not  approved  by  those  shareholders,   the
registration statement previously filed for Vanguard Mid-Cap Growth Fund will be
withdrawn.

     Shares of Vanguard  Mid-Cap  Growth Fund may not be sold, nor may offers to
buy be accepted, prior to the time the registration statement becomes effective.
This communication shall not constitute an offer to sell, nor shall there be any
sale of these securities in any state in which such offer, solicitation, or sale
would be unlawful prior to  registration or  qualification  under the securities
laws of any such state.

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.

                                                           THE VANGUARD GROUP(R)

VANGUARD MID-CAP GROWTH FUND

Prospectus
*, 2002

A GROWTH STOCK MUTUAL FUND

CONTENTS

*    FUND PROFILE

*    ADDITIONAL INFORMATION

*    MORE ON THE FUND

*    THE FUND AND VANGUARD

*    INVESTMENT ADVISER

*    DIVIDENDS, CAPITAL GAINS, AND TAXES

*    SHARE PRICE

*    FINANCIAL HIGHLIGHTS

*    INVESTING WITH VANGUARD

     *    Buying Shares

     *    Converting Shares

     *    Redeeming Shares

     *    Exchanging Shares

     *    Other Rules You Should Know

     *    Fund and Account Updates

     *    Contacting Vanguard

GLOSSARY (INSIDE BACK COVER)

- --------------------------------------------------------------------------------
WHY READING THIS PROSPECTUS IS IMPORTANT

This prospectus explains the investment  objective,  policies,  strategies,  and
risks  associated  with the 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 decide whether the Fund is the right
investment  for you.  We  suggest  that  you keep  this  prospectus  for  future
reference.
- --------------------------------------------------------------------------------

                                                                               1

FUND PROFILE

INVESTMENT OBJECTIVE

The Fund seeks to provide long-term capital appreciation.

PRIMARY INVESTMENT STRATEGIES

The Fund invests at least 80% of its net assets primarily in the common stock of
medium   size   companies   whose   market   capitalizations   fall  within  the
capitalization  range of the  companies  included in the Russell  MidCap  Growth
Index (currently  approximately $1-$14 billion). In selecting  investments,  the
adviser invests in those  medium-capitalization  companies  which,  based on its
analysis, it believes have the best prospects for future growth.

PRIMARY RISKS

An investment in the Fund could lose money over short or even long periods.  You
should expect the Fund's share price and total return to fluctuate within a wide
range like the overall stock market. The Fund's performance could be hurt by:

- -    INVESTMENT   STYLE   RISK,   which  is  the  chance   that   returns   from
     mid-capitalization stocks will trail returns from the overall stock market.
     Historically,  these  stocks  have been  more  volatile  in price  than the
     large-cap  stocks that dominate the overall  stock  market,  and they often
     perform quite differently.

- -    MANAGER RISK,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.

PERFORMANCE/RISK INFORMATION

The following bar chart and table are intended to help you  understand the risks
of  investing  in the Fund.  The bar  chart  shows  how the  Fund's  performance
(including  operating  expenses but excluding  shareholder fees) has varied from
one  calendar  year to another for the past five years.  The table shows how the
Fund's  average  annual  total  returns  (including  operating  expenses and any
applicable  shareholder fees) compare with those of a relevent market index over
set  periods of time.  Keep in mind that the Fund's  past  performance  does not
indicate how it will perform in the future.*

- --------------------------------------------------------------------------------
                              ANNUAL TOTAL RETURNS
- --------------------------------------------------------------------------------










- --------------------------------------------------------------------------------
The Fund's  year-to-date  return as of the most recent calendar  quarter,  which
ended March 31, 2002, was *%.
- --------------------------------------------------------------------------------

- ----------
*    Prior to *, 2002,  Vanguard  Mid-Cap Growth Fund was organized as Provident
     Investment Counsel Mid Cap Fund A and was sponsored by Provident Investment
     Counsel, its investment adviser.  The reorganization  brought the Fund into
     The Vanguard Group,  while  maintaining the same adviser and  substantially
     similar investment objective and strategies.

2

     During the period shown in the bar chart, the highest return for a calendar
quarter  was *%  (quarter  ended *), and the lowest  return for a quarter was *%
(quarter ended *).

     The table shows how the Fund's  average  annual  total  returns  (including
operating expenses and any applicable  shareholder fees) compare with those of a
relevent market index. The table also presents the impact of taxes on the Fund's
returns.  To  calculate  these  figures,  we assumed  that,  at the time of each
distribution  of income or capital  gains,  the  shareholder  was in the highest
federal tax bracket.  We did not take into  consideration  state or local income
taxes.

     In  certain   cases  the  figure   representing   "Return  After  Taxes  on
Distributions  and Sale of Fund  Shares"  may be HIGHER  than the  other  return
figures for the same period.  A higher  after-tax  return results when a capital
loss occurs upon  redemption and  translates  into an assumed tax deduction that
benefits the shareholder. Please note that your after-tax returns depend on your
tax situation and may differ from those shown.

     Also note that if you own the Fund in a  tax-deferred  account,  such as an
individual  retirement account or a 401(k) plan, this information does not apply
to your  investment,  because  such  accounts  are  subject  to taxes  only upon
distribution.

     Finally, keep in mind that the Fund's  performance--whether before taxes or
after taxes--does not indicate how it will perform in the future.

- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS                    PERIODS ENDED DECEMBER 31, 2001

                                                 1 YEAR        SINCE INCEPTION*
                                                 ------        ----------------
VANGUARD MID-CAP GROWTH FUND
  Return Before Taxes                               *%                *%
  Return After Taxes on Distributions               *                 *
  Return After Taxes on Distributions
    and Sale of Fund Shares                         *                 *
- --------------------------------------------------------------------------------
RUSSELL MIDCAP GROWTH INDEX (reflects no
  deduction for fees, expenses, or taxes)           *%                *%
- --------------------------------------------------------------------------------
* December 31, 1997.
- --------------------------------------------------------------------------------

FEES AND EXPENSES

The following  table  describes the fees and expenses you may pay if you buy and
hold Shares of the Fund. The expenses shown under ANNUAL FUND OPERATING EXPENSES
are based on amounts now in effect.*

SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
Sales Charge (Load) Imposed on Purchases:                                  None
Sales Charge (Load) Imposed on Reinvested Dividends:                       None
Redemption Fee:                                                            None

ANNUAL FUND OPERATING EXPENSES (EXPENSES DEDUCTED FROM THE FUND'S ASSETS)

Management Expenses:                                                          *%
12b-1 Distribution Fee:                                                    None
Other Expenses:                                                               *%
  TOTAL ANNUAL FUND OPERATING EXPENSES:                                    0.65%

- ----------
*    The information in the table has been restated to reflect current  expenses
     rather than last year's  expenses  because these  amounts  changed when the
     Fund became a member of The Vanguard Group on *, 2002.

                                                                               3

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund's  shares.  The  example  assumes  that the Fund  provides a
return of 5% a year, that operating  expenses match our estimates,  and that you
redeem your shares at the end of the given period.

          1 YEAR          3 YEARS          5 YEARS          10 YEARS
          ------          -------          -------          --------
            $*              $*               $*                $*

     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.

                                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.  Vanguard Mid-Cap Growth Fund's estimated  expense ratio for its first
full year of  operation  as a  Vanguard  fund is 0.65%,  or $6.50 per  $1,000 of
average net assets.  The average  midcap growth mutual fund had expenses in 2001
of *%, or $* per $1,000 of average  net assets  (derived  from data  provided by
Lipper Inc.,  which reports on the mutual fund industry).  Management  expenses,
which are one part of operating  expenses,  include investment  advisory fees as
well as other costs of managing a fund--such as account maintenance,  reporting,
accounting, legal, and other administrative expenses.

                                PLAIN TALK ABOUT
                               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.

ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS

Distributed annually in December

INVESTMENT ADVISER

Provident Investment Counsel, Pasadena, Calif., since inception

INCEPTION DATE

December 31, 1997

NET ASSETS AS OF OCTOBER 31, 2001

$* million

SUITABLE FOR IRAS

Yes

MINIMUM INITIAL INVESTMENT

$10,000; $1,000 for IRAs and custodial accounts for minors

NEWSPAPER ABBREVIATION
*

VANGUARD FUND NUMBER
*

CUSIP NUMBER
*

TICKER SYMBOL
*

4

MORE ON THE FUND

This  prospectus   describes  the  primary  risks  you  would  face  as  a  Fund
shareholder.  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 any mutual fund, you should
take  into  account  your  personal  tolerance  for  daily  fluctuations  in the
securities markets. Look for this [FLAG] symbol throughout the prospectus. It is
used to mark  detailed  information  about the more  significant  risks that you
would confront as a Fund shareholder.

     The  following  sections  explain the  primary  investment  strategies  and
policies  that the Fund uses in pursuit of its  objective.  The Fund's  board of
trustees, which oversees the Fund's management, may change investment strategies
or policies in the interest of shareholders  without a shareholder  vote, unless
those  strategies  or policies  are  designated  as  fundamental.  Note that the
investment objective of the Fund is not fundamental and may be changed without a
shareholder vote.

     Finally, you'll find information on other important features of the Fund.

MARKET EXPOSURE

The Fund's  primary  strategy is to invest at least 80% of its net assets in the
common stocks of mid-cap companies that offer strong growth potential.  However,
the Fund has  flexibility to invest the balance in other market  capitalizations
and  security  types.  Investing  in medium  capitalization  stocks may  involve
greater risk than investing in large  capitalization  stocks,  since they can be
subject to more  abrupt or erratic  movements  in value.  However,  they tend to
involve less risk than stocks of small companies.

                                PLAIN TALK ABOUT
                          GROWTH FUNDS AND VALUE FUNDS

Growth  investing  and value  investing  are two styles  employed  by stock fund
managers.   GROWTH  FUNDS  generally   focus  on  companies   believed  to  have
above-average  potential  for growth in revenue  and  earnings.  Reflecting  the
market's high  expectations for superior growth,  such stocks typically have low
dividend  yields  and  above-average  prices in  relation  to such  measures  as
revenue,  earnings,  and book value.  VALUE FUNDS generally  emphasize stocks of
companies  from which the market does not expect  strong  growth.  The prices of
value stocks  typically are  below-average  in comparison  with such measures as
earnings and book value, and these stocks typically pay  above-average  dividend
yields.  Growth and value stocks have, in the past,  produced similar  long-term
returns,  though each  category has periods when it  outperforms  the other.  In
general,  GROWTH FUNDS appeal to investors  who will accept more  volatility  in
hopes of a greater  increase  in share  price.  Growth  funds also may appeal to
investors with taxable accounts who want a higher  proportion of returns to come
as capital gains (which may be taxed at lower rates than dividend income). VALUE
FUNDS, by contrast,  are appropriate for investors who want some dividend income
and the  potential  for capital  gains,  but are less  tolerant  of  share-price
fluctuations.

[FLAG]    THE FUND IS SUBJECT TO STOCK  MARKET  RISK,  WHICH IS THE CHANCE  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.

                                                                               5

     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 Index,  a widely used barometer
of 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 (1926-2001)

                             1 YEAR     5 YEARS     10 YEARS     20 YEARS
                             ------     -------     --------     --------
     Best                     54.2%       28.6%       19.9%        17.8%
     Worst                   -43.1       -12.4        -0.8          3.1
     Average                  12.6        11.1        11.2         11.4

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 2001. You can see, for example,  that while the average return on common
stocks for ALL of the 5-year periods was 11.1%,  average  returns for INDIVIDUAL
5-year  periods  ranged from -12.4% (from 1928 through 1932) to 28.6% (from 1995
through 1999).  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.

[FLAG]    THE FUND IS SUBJECT TO INVESTMENT STYLE RISK, WHICH IS THE CHANCE THAT
          RETURNS  FROM THE  TYPES OF  STOCKS  IN WHICH IT  INVESTS  WILL  TRAIL
          RETURNS FROM THE OVERALL MARKET. AS A GROUP, MID-CAP STOCKS TEND 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.

SECURITY SELECTION

The investment  adviser  focuses on individual  companies  rather than trying to
identify the best market sectors going  forward.  This is often referred to as a
"bottom-up"  approach  to  investing.  The  adviser  seeks  companies  that have
displayed   exceptional   profitability,   market   share,   return  on  equity,
reinvestment  rates and sales and dividend  growth.  Companies with  significant
management goals, plans and controls, and leading proprietary positions in given
market niches are especially attractive.  Finally, the valuation of each company
is assessed relative to its industry, earnings growth and the market in general.

     In determining  whether to sell a security,  the adviser  considers various
factors such as fundamental changes within a particular company or its industry.
These  considerations are based on the adviser's research,  including analytical
procedures, market research or discussions with company management.

     The Fund is generally managed without regard to tax ramifications.

[FLAG]    THE FUND IS  SUBJECT  TO MANAGER  RISK,  WHICH IS THE CHANCE  THAT THE
          ADVISER WILL DO A POOR JOB OF SELECTING THE SECURITIES OR COUNTRIES IN
          WHICH THE FUND INVESTS.

OTHER INVESTMENT POLICIES AND RISKS

The Fund may also invest in stock index futures and options contracts, which are
types of  derivative.  Losses (or gains)  involving  futures  can  sometimes  be
substantial--in  part  because a  relatively  small price  movement in a futures
contract may result in an immediate and substantial loss (or gain) for the Fund.

6

[FLAG]    THE FUND MAY INVEST, TO A LIMITED EXTENT, IN DERIVATIVES.  DERIVATIVES
          MAY INVOLVE RISKS DIFFERENT FROM, AND POSSIBLY  GREATER THAN, THOSE OF
          TRADITIONAL INVESTMENTS.

     The Fund will not use derivatives for speculative  purposes or as leveraged
investments  that magnify gains or losses.  In addition,  the Fund's  obligation
under futures contracts will not exceed 20% of its total assets.

                                PLAIN TALK ABOUT
                                   DERIVATIVES

A derivative is a financial contract whose value is based on (or "derived" from)
a  traditional  security  (such  as a stock  or a  bond),  an  asset  (such as a
commodity like gold), or a market index (such as the S&P 500 Index).  Some forms
of  derivatives,  such as  exchange-traded  futures and  options on  securities,
commodities,  or indexes, have been trading on regulated exchanges for more than
two decades.  These types of  derivatives  are  standardized  contracts that can
easily be bought and sold,  and whose market values are determined and published
daily. Nonstandardized derivatives (such as swap agreements), on the other hand,
tend to be more specialized or complex,  and may be harder to value. If used for
speculation  or as leveraged  investments,  derivatives  can carry  considerable
risks.

     The reasons for which the Fund will invest in futures and options are:

- -    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks.

- -    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.

     Although  the  Fund  typically  does not make  significant  investments  in
foreign securities, it reserves the right to invest up to 20% of its assets this
way. Foreign securities may be traded in U.S. or foreign markets.  To the extent
that it owns foreign securities,  the Fund is subject to (1) COUNTRY RISK, which
is the chance  that  domestic  events--such  as  political  upheaval,  financial
troubles, or a natural disaster--will weaken a country's securities markets; and
(2) CURRENCY RISK,  which is the chance that a foreign  investment will decrease
in value because of unfavorable changes in currency exchange rates.

     The Fund may temporarily  depart from its normal  investment  policies--for
instance, by allocating  substantial assets to cash investments--in  response to
extraordinary market, economic, political, or other conditions. In doing so, the
Fund may succeed in avoiding losses but otherwise fail to achieve its investment
objective.

COSTS AND MARKET-TIMING

Some  investors  try to profit from a strategy  called  market-timing--switching
money into  mutual  funds when they expect  prices to rise and taking  money out
when they expect  prices 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.
This is why all  Vanguard  funds have  adopted  special  policies to  discourage
short-term  trading or to compensate the funds for the costs associated with it.
Specifically:

                                                                               7

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

- -    Each  Vanguard  fund (except the money market  funds)  limits the number of
     times that an investor can exchange into and out of the fund.

- -    Each Vanguard fund reserves the right to stop offering shares at any time.

- -    Certain   Vanguard  funds  charge  purchase   and/or   redemption  fees  on
     transactions.

See the INVESTING WITH VANGUARD  section of this  prospectus for further details
on Vanguard's transaction policies.

     THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING. DO NOT INVEST WITH VANGUARD
IF YOU ARE A MARKET-TIMER.

TURNOVER RATE

The  Fund  retains  the  right  to sell  securities  regardless  of how long the
securities have been held.  Historically,  due to its investment  strategy,  the
Fund has had a HIGH  turnover  rate.  The  Fund's  average  turnover  rate since
inception has been about *%. (A turnover rate of 100% would occur,  for example,
if the Fund sold and replaced securities valued at 100% of its net assets within
a one-year period.

                                PLAIN TALK ABOUT
                                  TURNOVER RATE

Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be distributed to  shareholders  as taxable
income. As of October 31, 2001, the average turnover rate for all mid-cap growth
funds was approximately *%, according to Morningstar, Inc.

THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies with more than 100 funds holding assets in excess of $500 billion. All
of the Vanguard funds share in the expenses associated with business operations,
such as personnel, office space, equipment, and advertising.

     Vanguard  also  provides   marketing   services  to  the  funds.   Although
shareholders do not pay sales commissions or 12b-1  distribution fees, each fund
pays its allocated share of The Vanguard Group's marketing costs.

8

                                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.

INVESTMENT ADVISER

Provident Investment Counsel (Provident),  300 North Lake Avenue,  Pasadena,  CA
91101,  adviser  to the Fund,  traces  its  origins  to an  investment  advisory
partnership  formed in 1951. It is now an indirect,  wholly owned  subsidiary of
Old Mutual plc, a United Kingdom based financial services group with substantial
asset  management,  insurance  and banking  businesses.  As of October 31, 2001,
Provident managed about $* million in assets.  The firm manages the Fund subject
to the control of the  trustees  and  officers of the Fund.  Its advisory fee is
paid  quarterly and is based on certain annual  percentage  rates applied to the
Fund's average month-end assets for each quarter. In addition, the quarterly fee
is increased or decreased  based upon  Provident's  performance in comparison to
its benchmark  index.  For these  purposes,  Provident's  cumulative  investment
performance over a trailing  36-month period is compared to the cumulative total
return of the Russell Midcap Growth Index.  Please consult the Fund's  STATEMENT
OF ADDITIONAL  INFORMATION  for a complete  explanation of how advisory fees are
calculated.

     For the fiscal year ended October 31, 2001,  the  investment  advisory fees
paid to  Provident  represented  an  effective  annual  rate of *% of the Fund's
average net assets.  (Please note that these fees were calculated  under a prior
advisory agreement.  Had the current fee schedule been in place for fiscal 2001,
the investment  advisory fee would have  represented an effective annual rate of
*% of the Fund's average net assets.)

     The adviser is authorized to choose  broker-dealers  to handle the purchase
and sale of the Fund's  portfolio  securities,  and to obtain the best available
price and most  favorable  execution for all  transactions.  Also,  the Fund may
direct  the  adviser to use a  particular  broker for  certain  transactions  in
exchange for commission rebates or research services provided to the Fund.

     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or the Fund.

     The board of trustees may, without prior approval from shareholders, change
the terms of an advisory agreement or hire a new investment adviser--either as a
replacement for an existing adviser or as an additional adviser. Any significant
change in the Fund's advisory  arrangements will be communicated to shareholders
in writing. In addition, as the Fund's sponsor and overall manager, The Vanguard
Group may provide investment advisory services to the Fund, on an at-cost basis,
at any time.


                                                                               9

                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER

Provident Investment Counsel employs a team-oriented  approach,  with a group of
investment professionals responsible for the day-to-day management of the Fund.

DIVIDENDS, CAPITAL GAINS, AND TAXES

FUND DISTRIBUTIONS

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Distributions generally occur in December. You can receive
distributions  of  income  or  capital  gains  in  cash,  or you can  have  them
automatically reinvested in more shares of the Fund.

                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS

As a  shareholder,  you are  entitled  to your  portion of a fund's  income from
interest  and  dividends  as well as gains  from the  sale of  investments.  You
receive  such  earnings  as either an  INCOME or a CAPITAL  GAINS  DISTRIBUTION.
INCOME  consists  of both  the  dividends  that the fund  earns  from any  stock
holdings  and  the  interest  it  receives   from  any  money  market  and  bond
investments.  CAPITAL GAINS are realized  whenever the fund sells securities for
higher prices than it paid for them.  These capital gains are either  short-term
or long-term,  depending on whether the fund held the securities for one year or
less or for more than one year.

BASIC TAX POINTS

Vanguard will send you a statement  each year showing the tax status of all your
distributions.  In addition,  taxable investors should be aware of the following
basic tax points:

- -    Distributions are taxable to you for federal income tax purposes whether or
     not you reinvest these amounts in additional Fund shares.

- -    Distributions   declared  in  December--if  paid  to  you  by  the  end  of
     January--are  taxable  for  federal  income tax  purposes as if received in
     December.

- -    Any dividends and short-term  capital gains that you receive are taxable to
     you as ordinary income for federal income tax purposes.

- -    Any  distributions  of net  long-term  capital  gains are taxable to you as
     long-term capital gains for federal income tax purposes, no matter how long
     you've owned shares in the Fund.

- -    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.

- -    A sale or exchange of Fund shares 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.

- -    Dividend and capital gains  distributions that you receive, as well as your
     gains or losses from any sale or exchange of Fund shares, may be subject to
     state and local income taxes.

- -    Any conversion  between  classes of shares of the SAME fund is a nontaxable
     event.  By  contrast,  an exchange  between  classes of shares of DIFFERENT
     funds IS a taxable event.

10

                                PLAIN TALK ABOUT
                               "BUYING A DIVIDEND"

Unless you are investing through a tax-deferred  retirement  account (such as an
IRA), you should  consider  avoiding a purchase of fund shares of a fund shortly
before the fund  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 will 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 received--even if you reinvest it in more shares. To avoid
"buying a dividend," check a fund's distribution schedule before you invest.

GENERAL INFORMATION

BACKUP  WITHHOLDING.   By  law,  Vanguard  must  withhold  30%  of  any  taxable
distributions or redemptions from your account if you do not:

- -    Provide us with your correct taxpayer identification number;

- -    Certify that the taxpayer identification number is correct; and

- -    Confirm that you are not subject to backup withholding.

Similarly,  Vanguard must withhold  taxes from your account if the IRS instructs
us to do so. FOREIGN  INVESTORS.  Vanguard funds  generally are not sold outside
the United States, except to certain qualifying investors. If you reside outside
the  United  States,  please  consult  our  website at  VANGUARD.COM  and review
"Non-U.S.  Investors."  Foreign investors should be aware that U.S.  withholding
and estate taxes may apply to any investments in Vanguard funds.

INVALID  ADDRESSES.  If a dividend or capital gains distribution check mailed to
your address of record is returned as undeliverable, Vanguard will automatically
reinvest  all future  distributions  until you  provide us with a valid  mailing
address.

TAX CONSEQUENCES.  This prospectus provides general tax information only. If you
are investing through a tax-deferred retirement account, such as an IRA, special
tax rules apply. Please consult your tax adviser for detailed  information about
a fund's tax consequences for you.

SHARE PRICE

The Fund's share price,  called its NET ASSET VALUE,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock Exchange,
generally  4 p.m.,  Eastern  time.  Net asset  value per  share is  computed  by
dividing the net assets of the Fund by the number of Fund shares outstanding. On
holidays or other days when the Exchange is closed,  the NAV is not  calculated,
and the Fund does not transact  purchase or  redemption  requests.  However,  on
those days the value of the Fund's assets may be affected to the extent that the
Fund holds foreign securities that trade on foreign markets that are open.

     Stocks  held by a  Vanguard  fund are  valued at their  MARKET  VALUE  when
reliable  market  quotations  are readily  available.  Certain  short-term  debt
instruments  used to manage a fund's  cash are valued on the basis of  amortized
cost.  The values of any foreign  securities  held by a fund are converted  into
U.S. dollars using an exchange rate obtained from an independent third party.

     When reliable market quotations are not readily  available,  securities are
priced at their FAIR VALUE,  calculated  according to procedures  adopted by the
board of  trustees.  A fund also may use  fair-value  pricing  if the value of a
security it holds is materially  affected by events occurring after the close of

                                                                              11

the primary  markets or  exchanges  on which the  security is traded.  This most
commonly occurs with foreign  securities,  but may occur in other cases as well.
When fair-value pricing is employed,  the prices of securities used by a fund to
calculate its net asset value may differ from quoted or published prices for the
same securities.

     Vanguard  fund share prices can be found daily in the mutual fund  listings
of most major newspapers under various "Vanguard" headings.

FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's  financial  performance  for the periods shown,  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 the Fund (assuming  reinvestment of all dividend and capital
gains  distributions).  The  information  for the two years in the period  ended
October 31,  2000,  has been derived from the  financial  statements  audited by
Price-waterhouseCoopers  LLP, independent accountants,  whose report--along with
the Fund's  financial  statements--is  included in the Fund's most recent annual
report to shareholders.  For the prior period, the Fund employed other auditors.
You may  have  the  annual  report  sent to you  without  charge  by  contacting
Vanguard.



- -----------------------------------------------------------------------------------------------
                                                           VANGUARD MID-CAP GROWTH FUND
                                                            PERIODS ENDED OCTOBER 31,*
                                                    -------------------------------------------
                                                     2001        2000        1999        1997**
- -----------------------------------------------------------------------------------------------
                                                                            
NET ASSET VALUE, BEGINNING OF PERIOD                $     *     $ 15.87     $ 10.53     $ 10.00
- -----------------------------------------------------------------------------------------------
INCOME FROM INVESTMENT OPERATIONS
  Net Investment Loss                                     *       (0.22)      (0.11)      (0.03)
  Net Realized and Unrealized Gain on Investments         *       15.13        5.45        0.56
- -----------------------------------------------------------------------------------------------
    Total from Investment Operations                      *       14.91        5.34        0.53
- -----------------------------------------------------------------------------------------------
LESS DISTRIBUTIONS
  From Net Realized Gains                                 *       (0.94)       0.00        0.00
    Total Distributions                                   *       (0.94)       0.00        0.00
- -----------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                      $     *     $ 29.84     $ 15.87     $ 10.53
===============================================================================================
TOTAL RETURN                                              *%      97.09%      50.71%       5.30%***
===============================================================================================

RATIOS/SUPPLEMENTAL DATA
  Net Assets, End of Period (Millions)              $     *     $  36.0     $  11.9     $   5.7
RATIOS TO AVERAGE NET ASSETS+
  Expenses                                                *%       1.39%       1.39%       1.04%++
  Net investment loss                                     *%      -1.03%      -1.03%      -0.43%++
  Portfolio Turnover Rate+++                              *%     185.88%     144.64%     166.89%
===============================================================================================

- ----------
*    The Fund was organized as Provident  Investment Counsel Mid Cap Fund A, and
     was not a member of The Vanguard  Group.  On o, 2002, the Fund acquired all
     assets and liabilities of Provident  Investment Counsel Mid Cap Fund A in a
     tax-free   reorganization.   The  Fund  had  no  operations  prior  to  the
     reorganization.
**   For the period ended December 31, 1997 (Commencement of Operations) through
     October 31, 1998.
***  Not annualized.
+    Includes  the Fund's  share of  expenses,  net of fees waived and  expenses
     absorbed,  allocated from the related  Portfolio.  The combined fees waived
     and expenses absorbed were 0.80%, 2.60%, and 4.11%, respectively.
++   Annualized.
+++  Portfolio turnover rate of Provident Mid Cap Portfolio, in which all of the
     Fund's assets are invested.

12

                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began fiscal year 2001 with a net asset value  (price) of $* per share.
During  the  year,  the Fund  earned $* from  investment  income  (interest  and
dividends). There was a decline of $* per share in the value of investments held
or sold by the Fund,  resulting in a net decline of $* per share from investment
operations.

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

The share price at the end of the year was $*, reflecting losses of $* per share
and  distributions of $* per share. This was a decrease of $* per share (from $*
at the  beginning of the year to $* at the end of the year).  For a  shareholder
who  reinvested  the  distributions  in the purchase of more  shares,  the total
return was *% for the year.

As of October 31, 2001, the Fund had $* million in net assets. For the year, the
expense ratio was *% ($* per $* of net assets),  and the net  investment  income
amounted  to *% of average  net assets.  The Fund sold and  replaced  securities
valued at *% of its net assets.

                                                                              13

INVESTING WITH VANGUARD

This  section  of the  prospectus  explains  the basics of doing  business  with
Vanguard. A special booklet, THE VANGUARD SERVICE DIRECTORY, provides details of
our many shareholder services for individual investors.  A separate booklet, THE
COMPASS,  does the same for  institutional  investors.  You can  request  either
booklet  by  calling  or  writing  Vanguard,   using  the  CONTACTING   VANGUARD
instructions found at the end of this section.

                                  BUYING SHARES
                                REDEEMING SHARES
                                EXCHANGING SHARES
                           OTHER RULES YOU SHOULD KNOW
                            FUND AND ACCOUNT UPDATES
                               CONTACTING VANGUARD

BUYING SHARES

ACCOUNT MINIMUMS FOR INVESTOR SHARES

TO OPEN AND MAINTAIN AN ACCOUNT: $10,000 for regular accounts;  $1,000 for IRAs,
and custodial accounts for minors.  (Shareholders who invested in the Fund prior
to * 2002,  will continue to be subject to a minimum  account  balance of $1,000
for  regular  accounts;  $500 for  retirement  accounts.)  TO ADD TO AN EXISTING
ACCOUNT: $100 by mail or exchange; $1,000 by wire.

     Vanguard  reserves  the right to increase or  decrease  the minimum  amount
required  to open and  maintain an  account,  or to add to an existing  account,
without prior notice.

HOW TO BUY SHARES

BY CHECK: Mail your check and a completed account registration form to Vanguard.
When adding to an existing account,  send your check with an Invest-By-Mail form
detached  from your last  account  statement.  Make your check  payable  to: THE
VANGUARD GROUP-- *. For a list of addresses, see CONTACTING VANGUARD.

BY EXCHANGE PURCHASE:  You can purchase shares with the proceeds of a redemption
from another Vanguard fund under our exchange privilege. SEE EXCHANGING SHARES.

BY WIRE: Call Vanguard to purchase shares by wire. See CONTACTING VANGUARD.

YOUR PURCHASE PRICE

You buy shares at a fund's  next-determined  NAV after  Vanguard  receives  your
purchase  request.  As long as your  request  is  received  before  the close of
regular trading on the New York Stock Exchange (generally 4 p.m., Eastern time),
you will buy your shares at that day's NAV. This is known as your TRADE DATE.

14

PURCHASE RULES YOU SHOULD KNOW

[CHECKMARK]    THIRD  PARTY  CHECKS.  To protect  the funds  from  check  fraud,
               Vanguard will not accept checks made payable to third parties.

[CHECKMARK]    U.S.  CHECKS ONLY.  All  purchase  checks must be written in U.S.
               dollars and drawn on a U.S. bank.

[CHECKMARK]    LARGE  PURCHASES.  Vanguard  reserves  the  right to  reject  any
               purchase   request  that  may  disrupt  a  fund's   operation  or
               performance.  Please call us BEFORE  attempting to invest a large
               dollar amount.

[CHECKMARK]    NO  CANCELLATIONS.  Place your  transaction  requests  carefully.
               Vanguard  will  NOT  cancel  any  transaction  once  it has  been
               initiated  and  a  confirmation  number  has  been  assigned  (if
               applicable).

[CHECKMARK]    FUTURE  PURCHASES.  All Vanguard  funds reserve the right to stop
               selling  shares  at any  time,  or to  reject  specific  purchase
               requests,  including  purchases by exchange from another Vanguard
               fund, at anytime, for any reason.

REDEEMING SHARES

HOW TO REDEEM SHARES

Be sure to check OTHER RULES YOU SHOULD KNOW before initiating your request.

ONLINE: Request a redemption through our website at VANGUARD.COM.

BY  TELEPHONE:  Contact  Vanguard  by  telephone  to request a  redemption.  For
telephone numbers, see CONTACTING VANGUARD.

BY MAIL: Send your written redemption  instructions to Vanguard.  For addresses,
see CONTACTING VANGUARD.

YOUR REDEMPTION PRICE

You redeem shares at a fund's  next-determined  NAV after Vanguard receives your
redemption  request,  INCLUDING  ANY SPECIAL  DOCUMENTATION  REQUIRED  UNDER THE
CIRCUMSTANCES.  As long as your request is received  before the close of regular
trading on the New York Stock Exchange  (generally 4 p.m.,  Eastern time),  your
shares are redeemed at that day's NAV. This is known as your TRADE DATE.

TYPES OF REDEMPTIONS

[CHECKMARK]    CHECK  REDEMPTIONS:  Unless instructed  otherwise,  Vanguard will
               mail you a check, normally within two business days of your trade
               date.

[CHECKMARK]    EXCHANGE  REDEMPTIONS:  You may  instruct  Vanguard  to apply the
               proceeds  of  your  redemption  to  purchase  shares  of  another
               Vanguard  fund  under  our  exchange  privilege.  SEE  EXCHANGING
               SHARES.

[CHECKMARK]    WIRE  REDEMPTIONS:  When  redeeming from a money market fund or a
               bond fund,  you may  instruct  Vanguard  to wire your  redemption
               proceeds  to  a  previously   designated   bank   account.   Wire
               redemptions are not available for

                                                                              15

               Vanguard's  other  funds.  The  wire  redemption  option  is  NOT
               AUTOMATIC;  you must establish it by completing a special form or
               the appropriate section of your account registration.  Also, wire
               redemptions  must be  requested in writing or by  telephone,  NOT
               online.  For these  funds,  a $5 fee applies to wire  redemptions
               under $5,000.

               MONEY MARKET FUNDS: For telephone  requests  received at Vanguard
               by 10:45 a.m., Eastern time, the redemption  proceeds will arrive
               at your bank by the close of  business  that same day.  For other
               requests  received  before 4 p.m.,  Eastern time,  the redemption
               proceeds will arrive at your bank by the close of business on the
               following business day.

               BOND FUNDS: For requests received at Vanguard by 4 p.m.,  Eastern
               time,  the  redemption  proceeds  will arrive at your bank by the
               close of business on the following business day.

REDEMPTION RULES YOU SHOULD KNOW

[CHECKMARK]    SPECIAL ACCOUNTS. Special documentation may be required to redeem
               from  certain  types  of  accounts,  such  as  trust,  corporate,
               nonprofit,   or  retirement  accounts.   Please  call  us  BEFORE
               attempting to redeem from these types of accounts.

[CHECKMARK]    POTENTIALLY DISRUPTIVE  REDEMPTIONS.  Vanguard reserves the right
               to pay all or part of your  redemption  in-kind--that  is, in the
               form of  securities--if  we believe that a cash redemption  would
               disrupt  the  Fund's   operation  or  performance.   Under  these
               circumstances,  Vanguard also reserves the right to delay payment
               of your  redemption  proceeds for up to seven days. By calling us
               BEFORE you attempt to redeem a large dollar amount,  you are more
               likely to avoid in-kind or delayed payment of your redemption.

[CHECKMARK]    RECENTLY  PURCHASED  SHARES.  While you can redeem  shares at any
               time,  proceeds will not be made  available to you until the Fund
               collects  payment  for  your  purchase.  This  may take up to ten
               calendar  days for shares  purchased  by check or  Vanguard  Fund
               Express(R).

[CHECKMARK]    SHARE  CERTIFICATES.  If share  certificates have been issued for
               your account,  those shares cannot be redeemed  until youU return
               the  certificates  (unsigned) to Vanguard by registered mail. For
               the correct address, see CONTACTING VANGUARD.

[CHECKMARK]    PAYMENT  TO A  DIFFERENT  PERSON  OR  ADDRESS.  We can make  your
               redemption  check  payable to a different  person or send it to a
               different address.  However, this requires the written consent of
               all  registered  account  owners,  which must be  provided  under
               signature  guarantees.  You can obtain a signature guarantee from
               most   commercial  and  savings  banks,   credit  unions,   trust
               companies, or member firms of a U.S. stock exchange.

[CHECKMARK]    NO  CANCELLATIONS.  Place your  transaction  requests  carefully.
               Vanguard  will  NOT  cancel  any  transaction  once  it has  been
               initiated  and  a  confirmation  number  has  been  assigned  (if
               applicable).

16

[CHECKMARK]    EMERGENCY  CIRCUMSTANCES.  Vanguard funds can postpone payment of
               redemption proceeds for up to seven calendar days at any time. In
               addition,  Vanguard funds can suspend redemptions and/or postpone
               payments of redemption  proceeds at times when the New York Stock
               Exchange  is  closed  or  during  emergency   circumstances,   as
               determined by the U.S. Securities and Exchange Commission.

EXCHANGING SHARES

All Vanguard funds accept exchange requests by Web, telephone or mail.  However,
because  excessive  exchanges can disrupt  management of a fund and increase the
fund's  costs  for all  shareholders,  Vanguard  places  certain  limits  on the
exchange  privilege.  For the U.S. STOCK INDEX FUNDS,  INTERNATIONAL STOCK INDEX
FUNDS,  REIT INDEX  FUND,  BALANCED  INDEX  FUND,  CALVERT  SOCIAL  INDEX  FUND,
INTERNATIONAL GROWTH FUND, INTERNATIONAL VALUE FUND, INTERNATIONAL EXPLORER FUND
AND GROWTH AND INCOME FUND these limits generally are as follows:

- -    No telephone or Web exchanges between 2:30 p.m. and 4 p.m., Eastern time on
     business  days.  ANY  EXCHANGE  REQUEST  PLACED  DURING THESE HOURS WILL BE
     REJECTED.  On days when the New York Stock  Exchange is  scheduled to close
     early,  this end-of-day  restriction will be adjusted to 1.5 hours prior to
     the scheduled close.  (For example,  if the NYSE is scheduled to close at 1
     p.m.,  Eastern time,  the cut-off for phone and Web exchanges will be 11:30
     a.m. Eastern time.)

- -    No more than two  exchanges  OUT of a fund may be requested by telephone or
     Web within any 12-month period.

- -    Each fund reserves the right to reject exchanges considered excessive.

For ALL OTHER VANGUARD FUNDS, the following limits generally apply:

- -    No more than two substantive "round trips" through a non-money-market  fund
     during any 12-month period.

- -    A "round trip" is a redemption  OUT of a fund (by any means)  followed by a
     purchase back INTO the same fund (by any means).

- -    Round trips must be at least 30 days apart.

                                                                              17

- -    "Substantive" means a dollar amount that Vanguard  determines,  in its sole
     discretion, could adversely affect management of the fund.

- -    Each fund reserves the right to reject exchanges considered excessive.

Please note that Vanguard reserves the right to revise or terminate the exchange
privilege, limit the amount of any exchange, or reject an exchange, at any time,
for any reason.

ALSO, IN THE EVENT OF A CONFLICT  BETWEEN THE EXCHANGE  PRIVILEGES OF TWO FUNDS,
THE STRICTER POLICY WILL APPLY TO THE TRANSACTION.

OTHER RULES YOU SHOULD KNOW

TELEPHONE TRANSACTIONS

[CHECKMARK]    AUTOMATIC. In setting up your account, we'll automatically enable
               you to do  business  with us by  regular  telephone,  UNLESS  YOU
               INSTRUCT US OTHERWISE IN WRITING.

[CHECKMARK]    TELE-ACCOUNT(R).   To  conduct   account   transactions   through
               Vanguard's  automated telephone service,  you must first obtain a
               personal identification number (PIN). Call Tele-Account to obtain
               a PIN, and allow seven days before using this service.

[CHECKMARK]    PROOF OF A CALLER'S  AUTHORITY.  We reserve the right to refuse a
               telephone  request  if  the  caller  is  unable  to  provide  the
               following information EXACTLY AS REGISTERED ON THE ACCOUNT:

               -    Ten-digit account number.
               -    Complete owner name and address.
               -    Primary Social Security or employer identification number.
               -    Personal Identification Number (PIN), if applicable.

[CHECKMARK]    SUBJECT TO REVISION.  We reserve the right to revise or terminate
               Vanguard's  telephone  transaction  service at any time,  without
               notice.

[CHECKMARK]    SOME VANGUARD  FUNDS DO NOT PERMIT  TELEPHONE  EXCHANGES  BETWEEN
               2:30 P.M. AND 4 P.M. To discourage  market-timing,  the following
               Vanguard  funds  generally  do  not  permit  telephone  exchanges
               between 2:30 p.m.  and 4 p.m. on business  days:  the U.S.  Stock
               Index Funds,  the  International  Stock Index  Funds,  REIT Index
               Fund,   Balanced   Index  Fund,   Cal-vert   Social  Index  Fund,
               International    Growth   Fund,    International    Value   Fund,
               International  Explorer Fund,  and Growth and Income Fund.  Funds
               may be added to or  deleted  from this  list at any time  without
               prior notice to shareholders.

VANGUARD.COM

[CHECKMARK]    REGISTRATION.  You can use your personal  computer to review your
               account  holdings,  to sell or exchange  shares of most  Vanguard
               funds,  and to perform  other  transactions.  To  establish  this
               service, you can register online.

18

[CHECKMARK]    SOME VANGUARD FUNDS DO NOT PERMIT ONLINE  EXCHANGES  BETWEEN 2:30
               P.M.  AND 4  P.M.  To  discourage  market-timing,  the  following
               Vanguard funds generally do not permit online  exchanges  between
               2:30 p.m.  and 4 p.m.  on  business  days:  the U.S.  Stock Index
               Funds,  the  International  Stock Index  Funds,  REIT Index Fund,
               Balanced  Index Fund,  Calvert  Social Index Fund,  International
               Growth Fund,  International  Value Fund,  International  Explorer
               Fund and Growth and Income Fund. Funds may be added to or deleted
               from this list at any time without prior notice to shareholders.

WRITTEN INSTRUCTIONS

[CHECKMARK]    "GOOD ORDER" REQUIRED. We reserve the right to reject any written
               transaction instructions that are not in "good order." This means
               that your instructions 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.
               -    Signature guarantees, if required for the type of
                    transaction.*
               -    Any supporting legal documentation that may be required.

- ----------
*    For  instance,  signature  guarantees  must be provided  by all  registered
     account shareholders when redemption proceeds are to be sent to a different
     person  or  address.   Call  uVanguard  for  specific  signature  guarantee
     requirements.

RESPONSIBILITY FOR FRAUD

Vanguard will not be responsible for any account losses due to fraud, so long as
we reasonably believe that the person transacting on an account is authorized to
do so. Please take precautions to protect yourself from fraud. Keep your account
information  private and immediately  review any account statements that we send
to you.  Contact Vanguard  immediately  about any transactions you believe to be
unauthorized.

UNCASHED CHECKS

Please cash your distribution or redemption  checks promptly.  Vanguard will not
pay interest on uncashed checks.

UNUSUAL CIRCUMSTANCES

If you experience  difficulty  contacting  Vanguard online, by telephone,  or by
Tele-Account,  you can send us your  transaction  request  by regular or express
mail. See CONTACTING VANGUARD for addresses.

INVESTING WITH VANGUARD THROUGH OTHER FIRMS

You may  purchase  or sell  Investor  Shares of most  Vanguard  funds  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.

                                                                              19

LOW-BALANCE ACCOUNTS

All   Vanguard   funds   reserve   the  right  to  close   any   investment-only
retirement-plan  account or any nonretirement  account whose balance falls below
the minimum  initial  investment.  If a fund has a redemption fee, that fee will
apply to shares that are redeemed upon closure of the account.

     Vanguard deducts a $10 fee in June from each  nonretire-ment  account whose
balance at that time is below $2,500 ($500 for Vanguard  STAR(TM) Fund). The fee
is waived if your total Vanguard account assets are $50,000 or more.

FUND AND ACCOUNT UPDATES

PORTFOLIO SUMMARIES

We will send you  quarterly  portfolio  summaries to help you keep track of your
accounts  throughout  the year.  Each  summary  shows the  market  value of your
account  at the close of the  statement  period,  as well as all  distributions,
purchases, sales, and exchanges for the current calendar year.

AVERAGE COST REVIEW STATEMENTS

For most taxable  accounts,  average cost review  statements  will accompany the
quarterly portfolio summaries.  These statements show the average cost of shares
that you  redeemed  during the current  calendar  year,  using the average  cost
single category method, which is one of the methods established by the IRS.

CONFIRMATION STATEMENTS

Each time you buy,  sell,  or  exchange  shares,  we will  send you a  statement
confirming the trade date and amount of your transaction.

TAX STATEMENTS

We will send you annual tax  statements  to assist in preparing  your income tax
returns.  These statements,  which are generally mailed in January,  will report
the previous year's dividend and capital gains distributions,  proceeds from the
sale of shares, and distributions from IRAs or other retirement plans.

ANNUAL AND SEMIANNUAL REPORTS

Financial  reports  about  Vanguard  Mid-Cap  Growth Fund will be mailed twice a
year, in June and December. These comprehensive reports include overviews of the
financial markets and specific information concerning the Fund:

- -    Performance assessments with comparisons to industry benchmarks.
- -    Reports from the adviser.
- -    Financial statements with detailed listings of the Fund's holdings.

20

     To keep  the  Fund's  costs  as low as  possible  (so  that  you and  other
shareholders  can keep more of its investment  earnings),  Vanguard  attempts to
eliminate duplicate mailings to the same address.  When we find that two or more
shareholders  have the same last name and address,  we send just one copy of the
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.

CONTACTING VANGUARD

ONLINE                        VANGUARD.COM

                              -    Your best source of Vanguard news
                              -    For fund, account, and service information
                              -    For most account transactions
                              -    For literature requests
                              -    24 hours per day, 7 days per week

VANGUARD TELE-ACCOUNT(R)      -    For automated fund and account information
1-800-662-6273                -    For  redemptions  by check, exchange (subject
(ON-BOARD)                         to certain limitations), or wire
                              -    Toll-free, 24 hours per day, 7 days per week

INVESTOR INFORMATION          -    For fund and service information
1-800-662-7447 (SHIP)         -    For literature requests
(TEXT TELEPHONE AT            -    Business hours only
1-800-952-3335)

CLIENT SERVICES               -    For account information
1-800-662-2739 (CREW)         -    For most account transactions
(TEXT TELEPHONE AT            -    Business hours only
1-800-749-7273)

INSTITUTIONAL DIVISION        -    For information and services for large
1-888-809-8102                     institutional investors
                              -    Business hours only

VANGUARD ADDRESSES            REGULAR MAIL (INDIVIDUALS--CURRENT CLIENTS):
                              The Vanguard Group
                              P.O. Box 1110
                              Valley Forge, PA 19482-1110

                              REGULAR MAIL (INSTITUTIONS):
                              The Vanguard Group
                              P.O. Box 2900
                              Valley Forge, PA 19482-2900

                                                                              21

                              REGULAR MAIL (GENERAL INQUIRIES):
                              The Vanguard Group
                              P.O. Box 2600
                              Valley Forge, PA 19482-2600

                              REGISTERED OR EXPRESS MAIL:
                              The Vanguard Group 455 Devon
                              Park Drive Wayne, PA 19087-1815

FUND NUMBER                   Please use the specific fund number when
                              contacting us about Vanguard Mid-Cap Growth
                              Fund--*.

22




















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GLOSSARY OF INVESTMENT TERMS

CAPITAL GAINS DISTRIBUTION

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

CASH INVESTMENTS

Cash deposits,  short-term  bank  deposits,  and money market  instruments  that
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.

COUNTRY RISK

The chance that domestic events--such as political upheaval, financial troubles,
or a natural disaster--will weaken a country's securities markets.

CURRENCY RISK

The  chance  that a  foreign  investment  will  decrease  in  value  because  of
unfavorable changes in currency exchange rates.

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.

GROWTH STOCK FUND

A mutual fund that emphasizes stocks of companies believed to have above-average
prospects for growth in revenue and earnings. Reflecting market expectations for
superior   growth,   these  stocks   typically  have  low  dividend  yields  and
above-average prices in relation to such measures as revenue, earnings, and book
value.

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 also called its
share value or share price.

PRICE/EARNINGS (P/E) RATIO

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

PRINCIPAL

The amount of money you put into an investment.

SECURITIES

Stocks, bonds, money market instruments, and other investment vehicles.

TOTAL RETURN

A percentage change,  over a specified time period, in a mutual fund's net asset
value,  assuming the reinvestment of all  distributions of dividends and capital
gains.

VALUE STOCK FUND

A mutual fund that  emphasizes  stocks of companies  whose growth  prospects are
generally   regarded  as  subpar  by  the  market.   Reflecting   these   market
expectations,  the  prices  of  value  stocks  typically  are  below-average  in
comparison  with such  measures as earnings  and book  value,  and these  stocks
typically pay above-average dividend yields.

VOLATILITY

The  fluctuations  in value of a mutual  fund or other  security.  The greater a
fund's volatility, the wider the fluctuations in its returns.

YIELD

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

                                                     [SHIP]
                                                     THE VANGUARD GROUP(R)
                                                     Post Office Box 2600
                                                     Valley Forge, PA 19482-2600

FOR MORE INFORMATION

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

ANNUAL/SEMIANNUAL REPORTS TO SHAREHOLDERS

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

ALL MARKET INDEXES  REFERENCED IN THIS PROSPECTUS ARE THE EXCLUSIVE  PROPERTY OF
THEIR RESPECTIVE OWNERS.

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:
1-800-749-7273

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,  DC. To find out more  about this
public service,  call the SEC at  1-202-942-8090.  Reports and other information
about   the  Fund  are  also   available   on  the   SEC's   Internet   site  at
http://www.sec.gov, or you can receive copies of this information, for a fee, by
electronic  request at the following e-mail address:  publicinfo@sec.gov,  or by
writing  the Public  Reference  Section,  Securities  and  Exchange  Commission,
Washington, DC 20549-0102.

Fund's Investment Company Act file number: 811-07443

(C)2002 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation, Distributor.

P* *2002