DEAN WITTER CAPITAL APPRECIATION FUND
497, 1997-02-04
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<PAGE>
                        DEAN WITTER
 
                        CAPITAL APPRECIATION FUND
 
                        PROSPECTUS--JANUARY 28, 1997
 
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DEAN  WITTER CAPITAL APPRECIATION FUND (THE  "FUND") IS AN OPEN-END, DIVERSIFIED
MANAGEMENT INVESTMENT COMPANY  WHOSE INVESTMENT OBJECTIVE  IS LONG-TERM  CAPITAL
APPRECIATION.  THE  FUND SEEKS  TO MEET  ITS  INVESTMENT OBJECTIVE  BY INVESTING
PRIMARILY IN THE COMMON  STOCKS OF U.S.  COMPANIES THAT, IN  THE OPINION OF  THE
INVESTMENT  MANAGER,  OFFER THE  POTENTIAL FOR  EITHER SUPERIOR  EARNINGS GROWTH
AND/OR APPEAR TO BE UNDERVALUED. CURRENT INCOME IS NOT AN OBJECTIVE OF THE FUND.
(SEE "INVESTMENT OBJECTIVE AND POLICIES.")
 
Shares of  the  Fund are  continuously  offered  at net  asset  value.  However,
redemptions  and/or  repurchases  are  subject in  most  cases  to  a contingent
deferred sales charge, scaled down from 5% to 1% of the amount redeemed, if made
within six  years  of  purchase,  which  charge  will  be  paid  to  the  Fund's
Distributor,    Dean   Witter    Distributors   Inc.    See   "Redemptions   and
Repurchases--Contingent Deferred Sales Charge." In  addition, the Fund pays  the
Distributor  a distribution fee pursuant to a Plan of Distribution at the annual
rate of 1.0% of the lesser of the (i) average daily aggregate net sales or  (ii)
average  daily net  assets of  the Fund. See  "Purchase of  Fund Shares--Plan of
Distribution."
 
This Prospectus  sets forth  concisely the  information you  should know  before
investing  in the  Fund. It  should be read  and retained  for future reference.
Additional  information  about  the  Fund  is  contained  in  the  Statement  of
Additional  Information, dated January  28, 1997, which has  been filed with the
Securities and Exchange  Commission, and which  is available at  no charge  upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       3
 
Financial Highlights..............................       4
 
The Fund and its Management.......................       5
 
Investment Objective and Policies.................       5
 
  Risk Considerations.............................       6
 
Investment Restrictions...........................      10
 
Purchase of Fund Shares...........................      11
 
Shareholder Services..............................      12
 
Redemptions and Repurchases.......................      14
 
Dividends, Distributions and Taxes................      16
 
Performance Information...........................      17
 
Additional Information............................      17
</TABLE>
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY,  ANY BANK, AND THE  SHARES ARE NOT FEDERALLY  INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
DEAN WITTER
CAPITAL APPRECIATION FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
(212) 392-2550 or (800) 869-NEWS (toll-free)
 
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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                   DEAN WITTER DISTRIBUTORS INC. DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>               <C>
THE FUND          The  Fund is organized  as a Trust,  commonly known as  a Massachusetts business  trust, and is an
                  open-end, diversified management  investment company.  The Fund  invests primarily  in the  common
                  stocks  of U.S. companies that, in the opinion  of the Investment Manager, offer the potential for
                  either superior  earnings  growth and/or  appear  to be  undervalued.  Current income  is  not  an
                  objective of the Fund.
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SHARES OFFERED    Shares of beneficial interest with $.01 par value (see page 17).
- -------------------------------------------------------------------------------------------------------
 
OFFERING          At  net asset value (see page  11). Shares redeemed within six years  of purchase are subject to a
PRICE             contingent deferred sales charge under most circumstances (see page 14).
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MINIMUM           Minimum initial investment, $1,000 ($100 if the account is opened through EasyInvest-SM-); minimum
PURCHASE          subsequent investment, $100 (see page 11).
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INVESTMENT        The investment objective of the Fund is long-term capital appreciation.
OBJECTIVE
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INVESTMENT        Dean Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Fund,  and  its  wholly-owned
MANAGER           subsidiary,  Dean Witter Services Company Inc.,  serve in various investment management, advisory,
                  management and administrative capacities to 101 investment companies and other portfolios with net
                  assets under management of approximately $90 billion at December 31, 1996. (see page 5).
- -------------------------------------------------------------------------------------------------------
 
MANAGEMENT        The Investment Manager receives a monthly fee at the annual rate of 0.75% of the Fund's daily  net
FEE               assets (see page 5).
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DIVIDENDS AND     Dividends  from net  investment income  are paid  at least  annually. Capital  gains, if  any, are
DISTRIBUTIONS     distributed at least  annually or retained  for reinvestment  by the Fund.  Dividends and  capital
                  gains  distributions are automatically reinvested in additional shares at net asset value (without
                  sales charge), unless the shareholder elects to receive cash (see pages 12 and 16).
- -------------------------------------------------------------------------------------------------------
 
DISTRIBUTOR       Dean Witter Distributors Inc. (the "Distributor"). The  Distributor receives from the Fund a  Rule
AND DISTRIBUTION  12b-1  distribution fee accrued  daily and payable  monthly at the  rate of 1.0%  per annum of the
FEE               lesser of (i) the Fund's average  daily aggregate net sales or  (ii) the Fund's average daily  net
                  assets.  This fee compensates the Distributor for  the services provided in distributing shares of
                  the Fund which  includes payment  of sales  commissions to  account executives  and various  other
                  promotional  and  sales  related expenses.  The  Distributor  also receives  the  proceeds  of any
                  contingent deferred sales charges (see page 11).
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REDEMPTION--      Shares are redeemable  by the  shareholder at  net asset value.  An account  may be  involuntarily
CONTINGENT        redeemed  if the  total value  of the account  is less  than $100, or,  if the  account was opened
DEFERRED          through EasyInvest-SM-, if after twelve  months the shareholder has  invested less than $1,000  in
SALES             the  account. Although  no commission  or sales  load is  imposed upon  the purchase  of shares, a
CHARGE            contingent deferred sales charge (which  declines from 5% to 1%)  is imposed on any redemption  of
                  shares  if after such  redemption the aggregate  current value of  an account with  the Fund falls
                  below the aggregate amount of the investor's purchase payments made during the six years preceding
                  the redemption. However,  there is no  charge imposed  on redemption of  shares purchased  through
                  reinvestment of dividends or distributions (see pages 14-16).
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RISKS             The  net asset value of the  Fund's shares will fluctuate with changes  in the market value of its
                  portfolio securities.  The  market value  of  the Fund's  portfolio  securities will  increase  or
                  decrease  due to a variety of economic, market or political factors which cannot be predicted. The
                  Fund is intended for long-term  investors who can accept the  risks involved in seeking  long-term
                  capital  appreciation through the investment  primarily in the securities  of companies that offer
                  the potential for either superior  earnings growth and/or appear  to be undervalued. In  selecting
                  investments  for the Fund, the Investment Manager has  no general criteria as to a company's asset
                  size, earnings or industry type. It should be recognized that investing in such companies involves
                  greater risk than is customarily associated with investing in more established companies. The Fund
                  may invest in the securities of foreign issuers which entails additional risks. The Fund may  also
                  invest  in futures  and options  which may  be considered  speculative in  nature and  may involve
                  greater risks than those customarily assumed by other investment companies which do not invest  in
                  such  instruments.  An investment  in  shares of  the  Fund should  not  be considered  a complete
                  investment program and is not appropriate  for all investors. Investors should carefully  consider
                  their   ability  to  assume  these   risks  and  the  risks   outlined  under  the  heading  "Risk
                  Considerations," (pages 6-10) before making an investment in the Fund.
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</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                          ELSEWHERE IN THIS PROSPECTUS
                AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
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The  following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are for the fiscal
year ended November 30, 1996.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                 <C>
Maximum Sales Charge Imposed on Purchases.........  None
Maximum Sales Charge Imposed on Reinvested
 Dividends........................................  None
Contingent Deferred Sales Charge
  (as a percentage of the lesser of original
   purchase price or redemption proceeds).........  5.0%
</TABLE>
 
  A contingent  deferred sales  charge  is imposed  at the  following  declining
rates:
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE PAYMENT MADE                    PERCENTAGE
- --------------------------------------------------  ----------
<S>                                                 <C>
First.............................................     5.0%
Second............................................     4.0%
Third.............................................     3.0%
Fourth............................................     2.0%
Fifth.............................................     2.0%
Sixth.............................................     1.0%
Seventh and thereafter............................     None
</TABLE>
 
<TABLE>
<S>                                                 <C>
Redemption Fees...................................   None
Exchange Fee......................................   None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF
 AVERAGE NET ASSETS)
Management Fees...................................  0.75%
12b-1 Fees*.......................................  0.96%
Other Expenses....................................  0.29%
Total Fund Operating Expenses.....................  2.00%
</TABLE>
 
- ------------------------
* A  portion of  the 12b-1 fee  equal to 0.25%  of the Fund's  average daily net
  assets is  characterized as  a  service fee  within  the meaning  of  National
  Association  of Securities Dealers, Inc. ("NASD") guidelines (see "Purchase of
  Fund Shares").
 
<TABLE>
<CAPTION>
                                                                                    10
EXAMPLE                                             1 YEAR    3 YEARS   5 YEARS    YEARS
- --------------------------------------------------  -------   -------   -------   -------
<S>                                                 <C>       <C>       <C>       <C>
You would pay the  following expenses on a  $1,000
 investment, assuming (1) 5% annual return and (2)
 redemption at the end of each time period:.......    $70       $93       $128      $233
You  would pay the following  expenses on the same
 investment, assuming no redemption:..............    $20       $63       $108      $233
</TABLE>
 
THE ABOVE EXAMPLE SHOULD  NOT BE CONSIDERED A  REPRESENTATION OF PAST OR  FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs  and  expenses  that  an  investor  in  the  Fund  will  bear  directly or
indirectly. For a  more complete description  of these costs  and expenses,  see
"The  Fund  and  its Management,"  "Plan  of Distribution"  and  "Redemption and
Repurchases."
 
Long-term  shareholders  of  the  Fund  may  pay  more  in  sales  charges   and
distribution  fees than the  economic equivalent of  the maximum front-end sales
charges permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The following  ratios and  per share  data for  a share  of beneficial  interest
outstanding  throughout each period  have been audited  by Price Waterhouse LLP,
independent accountants.  The  per share  data  and  ratios should  be  read  in
conjunction  with the  financial statements,  notes thereto  and the unqualified
report of  independent  accountants which  are  contained in  the  Statement  of
Additional Information. Further information about the performance of the Fund is
contained  in the  Fund's Annual Report  to Shareholders, which  may be obtained
without charge upon request to the Fund.
 
<TABLE>
<CAPTION>
                                                                    FOR THE PERIOD
                                                 FOR THE YEAR      OCTOBER 27, 1995*
                                                     ENDED              THROUGH
                                               NOVEMBER 30, 1996   NOVEMBER 30, 1995
                                               -----------------   -----------------
<S>                                            <C>                 <C>
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of period.......       $ 10.53             $ 10.00
                                                     ------              ------
  Net investment loss........................         (0.15)              (0.01)
  Net realized and unrealized gain...........          2.61                0.54
                                                     ------              ------
  Total from investment operations...........          2.46                0.53
                                                     ------              ------
  Net asset value, end of period.............       $ 12.99             $ 10.53
                                                     ------              ------
                                                     ------              ------
TOTAL INVESTMENT RETURN+.....................         23.36%               5.30%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses...................................          2.00%               2.87%(2)
  Net investment loss........................         (1.72)%             (0.79)%(2)
SUPPLEMENTAL DATA:
  Net assets, end of period, in thousands....      $310,809            $102,009
  Portfolio turnover rate....................           108%                  7%(1)
  Average commission rate paid...............       $0.0570             --
</TABLE>
 
- ------------------------
 * COMMENCEMENT OF OPERATIONS.
 + DOES NOT REFLECT THE DEDUCTION OF  SALES CHARGE. CALCULATED BASED ON THE  NET
   ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
Dean  Witter Capital Appreciation Fund (the "Fund") is an open-end, diversified,
management investment company. The Fund is a trust of the type commonly known as
a "Massachusetts  business  trust" and  was  organized  under the  laws  of  The
Commonwealth of Massachusetts on July 31, 1995.
 
    Dean  Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment Manager.  The Investment  Manager, which  was incorporated  in  July,
1992,  is a wholly-owned subsidiary  of Dean Witter, Discover  & Co. ("DWDC"), a
balanced financial services organization providing  a broad range of  nationally
marketed credit and investment products.
 
    InterCapital  and its wholly-owned subsidiary,  Dean Witter Services Company
Inc.,  serve  in  various   investment  management,  advisory,  management   and
administrative capacities to 101 investment companies, 30 of which are listed on
the New York Stock Exchange, with combined assets of approximately $86.9 billion
at  December 31, 1996. The Investment Manager also manages portfolios of pension
plans, other institutions  and individuals which  aggregated approximately  $3.1
billion at such date.
 
    The  Fund  has retained  the  Investment Manager  to  provide administrative
services, manage its business  affairs and manage the  investment of the  Fund's
assets,  including the placing of orders for  the purchase and sale of portfolio
securities. InterCapital  has  retained Dean  Witter  Services Company  Inc.  to
perform the aforementioned administrative services for the Fund.
 
    The  Fund's Trustees  review the various  services provided by  or under the
direction of the Investment Manager to ensure that the Fund's general investment
policies and programs  are being  properly carried out  and that  administrative
services are being provided to the Fund in a satisfactory manner.
 
    As  full compensation for the services  and facilities furnished to the Fund
and for expenses of the  Fund assumed by the  Investment Manager, the Fund  pays
the  Investment Manager  monthly compensation  calculated daily  by applying the
annual rate of 0.75%  to the Fund's  net assets. This fee  is greater than  that
paid  by most other investment companies. For the fiscal year ended November 30,
1996, the Fund accrued total compensation to the Investment Manager amounting to
0.75% of the Fund's average net assets and the Fund's total expenses amounted to
2.00% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment  objective of  the Fund  is long-term  capital appreciation.  The
objective  is a fundamental  policy of the  Fund and may  not be changed without
shareholder approval. There is no assurance that the objective will be achieved.
 
    The Fund  seeks to  achieve  its investment  objective by  investing,  under
normal  circumstances, at least 65% of its  total assets in the common stocks of
U.S. companies  that,  in the  opinion  of  the Investment  Manager,  offer  the
potential for either superior earnings growth and/or appear to be undervalued.
 
    The  Investment Manager  will base  the selection  of stocks  for the Fund's
portfolio on research and analysis, taking into account, among other factors,  a
company's  price/earnings ratio (that is whether the current stock price appears
undervalued in relation  to earnings, projected  cash flow, or  asset value  per
share;  or the price-to-earnings  ratio is attractive  relative to the company's
underlying earnings growth  rate), growth  in sales,  market-to-book ratio,  the
quality of a company's balance sheet, sales-per-share and profitability in order
to  determine whether the  current market valuation is  less than the Investment
Manager's view of a company's intrinsic value. Also, when reviewing  investments
for   selection,   the   Investment   Manager   will   consider   the  following
characteristics of a  company: capable management;  attractive business  niches;
pricing flexibility; sound financial and accounting practices and a demonstrated
ability  or prospects  to consistently  grow revenues,  earnings and  cash flow.
Stocks may  also be  selected on  the basis  of whether  the Investment  Manager
believes that the potential exists for some catalyst (such as increased investor
attention,  asset sales, a new product/innovation, or a change in management) to
cause the  stock's  price to  rise.  Such factors  are  part of  the  Investment
Manager's overall investment selection process.
 
    The Investment Manager has no general criteria as to asset size, earnings or
industry  type which  would make  an investment  unsuitable for  purchase by the
Fund. In  addition,  since the  Investment  Manager is  seeking  investments  in
companies  whose securities may appear to be undervalued, there is no limitation
on the stock price  of any particular  investment. However, as  a result of  the
selection  process, which  focuses on fundamentals  in relation  to prices, such
review of investments  will include  companies with low-priced  stocks. In  this
category  are large companies with low-priced stocks (so called "fallen angels")
which, in
 
                                                                               5
<PAGE>
the opinion of the Investment Manager, may appear to be undervalued because they
are overlooked by many investors; may not be closely followed through investment
research and/or their prices may reflect pessimism about the companies'  (and/or
their  industries') outlook. Such companies, by virtue of their stock price, may
be takeover  candidates.  Low-priced stocks  are  also associated  with  smaller
companies whose securities' value may reflect a discount because of smaller size
and  lack of research coverage, emerging  growth companies and private companies
undergoing their initial public offering. The  Fund will invest in companies  of
all  sizes. For a discussion of the risks of investing in the securities of such
companies, see "Risk Considerations" below.
 
    Consequently, the  Fund  looks for  quality  businesses with  an  investment
outlook based upon a mix of growth potential, financial strength and fundamental
value.  The  focus on  price  and fundamentals  sets  the Fund  apart  from pure
"growth" or pure "value" funds. The  Fund's holdings will be widely  diversified
by  industry and company  and under most  circumstances, at the  time of initial
purchase, the average position will be less than 1.5% of the Fund's net assets.
 
    In addition to U.S. common stock, up  to 35% of the Fund's total assets  may
be  invested  in  debt  or  preferred  equity  securities  convertible  into  or
exchangeable for equity securities, rights and warrants, when considered by  the
Investment Manager to be consistent with the Fund's investment objective. (For a
discussion  of the  risks of  investing in each  of these  securities, see "Risk
Considerations" below.)
 
    The Fund may also invest in other debt securities without regard to  quality
or  rating, if in the opinion of the Investment Manager such securities meet the
investment criteria of  the Fund. The  Fund will not  purchase a  non-investment
grade debt security (or junk bond) if, immediately after such purchase, the Fund
would have more than 5% of its total assets invested in such securities.
 
    The Fund may invest up to 10% of its assets in foreign securities, including
non-dollar   denominated  securities  traded  outside   of  the  U.S.  and  U.S.
dollar-denominated securities such as  ADRs. (For a discussion  of the risks  of
investing in foreign securities, see "Risk Considerations" below.)
 
    There may be periods during which, in the opinion of the Investment Manager,
market  conditions warrant a reduction  of some or all  of the Fund's securities
holdings. During  such  periods, the  Fund  may adopt  a  temporary  "defensive"
posture  in which  greater than  35% of  its total  assets is  invested in money
market instruments or  cash, including  obligations issued or  guaranteed as  to
principal  or  interest  by  the  United  States  Government,  its  agencies  or
instrumentalities, certificates  of  deposit,  bankers'  acceptances  and  other
obligations  of domestic banks  having total assets  of $1 billion  or more, and
short-term commercial  paper of  corporations organized  under the  laws of  any
state or political subdivision of the United States.
 
    The  securities in  which the  Fund invests may  or may  not be  listed on a
national stock exchange, but if they are  not so listed, will generally have  an
established over-the-counter market.
 
RISK CONSIDERATIONS
 
Given  the investment risks described below, an investment in shares of the Fund
should not be considered  a complete investment program  and is not  appropriate
for  all investors. Investors should carefully  consider their ability to assume
these risks before making an investment in the Fund.
 
    The net asset value of the Fund's shares will fluctuate with changes in  the
market  value  of  its portfolio  securities.  The  market value  of  the Fund's
portfolio securities will  increase or decrease  due to a  variety of  economic,
market  or political factors which cannot be predicted. The Fund is intended for
long-term investors  who can  accept  the risks  involved in  seeking  long-term
capital  appreciation  through the  investment  primarily in  the  securities of
companies that offer the  potential for either  superior earnings growth  and/or
appear  to be undervalued. In selecting investments for the Fund, the Investment
Manager has  no general  criteria as  to  a company's  asset size,  earnings  or
industry type. It should be recognized that investing in such companies involves
greater  risk than is customarily associated  with investing in more established
companies.
 
    The Fund may invest in  securities of companies that  are not well known  to
the  investing public or  followed by many securities  analysts, with the result
that  there  may  be  less   publicly  available  information  concerning   such
securities.  Also, these securities may be more volatile in price and have lower
trading volumes. In addition, while companies in which the Fund may invest often
have sales and earnings growth rates  which may exceed those of large  companies
and  may be reflected in more rapid share price appreciation, such companies may
have limited operating histories, product lines, markets or financial  resources
and  they may  be dependent upon  one-person management. These  companies may be
subject to intense  competition from  larger companies. The  securities of  such
companies  may have limited marketability  and may be subject  to more abrupt or
erratic movements in price than securities of larger companies or in the  market
averages  in  general.  In  the  case  of  securities  of  large  companies with
lower-priced stock (the  so-called "fallen  angels"), the  risk associated  with
such investment is that the price may continue to fall.
RIGHTS  AND WARRANTS.   The  Fund may acquire  rights and/or  warrants which are
attached to  other  securities  in its  portfolio,  or  which are  issued  as  a
distribution  by the issuer of  a security held in  its portfolio. Rights and/or
warrants are, in  effect, options to  purchase equity securities  at a  specific
price,   generally   valid   for   a  specific   period   of   time,   and  have
 
6
<PAGE>
no voting  rights, pay  no dividends  and have  no rights  with respect  to  the
corporation issuing them.
 
CONVERTIBLE   SECURITIES.    The  Fund  may   acquire,  through  purchase  or  a
distribution by the issuer of a  security held in its portfolio, a  fixed-income
security  which  is convertible  into common  stock  of the  issuer. Convertible
securities rank senior  to common  stocks in a  corporation's capital  structure
and,  therefore, entail less risk than the corporation's common stock. The value
of a convertible security is a function of its "investment value" (its value  as
if  it did  not have  a conversion privilege),  and its  "conversion value" (the
security's worth if  it were  to be exchanged  for the  underlying security,  at
market value, pursuant to its conversion privilege).
 
    To the extent that a convertible security's investment value is greater than
its  conversion  value,  its  price  will  be  primarily  a  reflection  of such
investment value and its  price will be likely  to increase when interest  rates
fall and decrease when interest rates rise, as with a fixed-income security (the
credit  standing of the issuer and other factors  may also have an effect on the
convertible security's value).  If the conversion  value exceeds the  investment
value,  the price  of the  convertible security  will rise  above its investment
value and, in  addition, will sell  at some premium  over its conversion  value.
(This  premium  represents  the  price  investors are  willing  to  pay  for the
privilege of purchasing a  fixed-income security with  a possibility of  capital
appreciation  due to the conversion  privilege.) At such times  the price of the
convertible security  will tend  to fluctuate  directly with  the price  of  the
underlying equity security. A portion of the convertible securities in which the
Fund  may invest may be unrated or, if  rated, rated below investment grade by a
nationally recognized statistical rating organization.
 
FOREIGN SECURITIES.   The  Fund may  invest up  to 10%  of its  total assets  in
foreign securities. Foreign securities investments may be affected by changes in
currency   rates  or  exchange  control  regulations,  changes  in  governmental
administration or economic or monetary policy (in the United States and  abroad)
or  changed  circumstances  in  dealings between  nations.  Fluctuations  in the
relative rates  of exchange  between the  currencies of  different nations  will
affect  the value  of the  Fund's investments  denominated in  foreign currency.
Changes in foreign  currency exchange  rates relative  to the  U.S. dollar  will
affect  the U.S. dollar value of the  Fund's assets denominated in that currency
and thereby impact upon the Fund's total return on such assets.
 
    Foreign currency  exchange rates  are  determined by  forces of  supply  and
demand  on the foreign exchange markets. These forces are themselves affected by
the  international  balance  of  payments  and  other  economic  and   financial
conditions,  government intervention,  speculation and  other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the  currencies trade. The  foreign currency transactions  of
the  Fund will be conducted on a  spot basis or through forward foreign currency
exchange contracts  (described below).  The  Fund will  incur certain  costs  in
connection with these currency transactions.
 
    Investments  in  foreign securities  will  also occasion  risks  relating to
political  and  economic  developments  abroad,  including  the  possibility  of
expropriations  or confiscatory taxation, limitations on  the use or transfer of
Fund  assets  and  any  effects   of  foreign  social,  economic  or   political
instability. Foreign companies are not subject to the regulatory requirements of
U.S.  companies and, as  such, there may be  less publicly available information
about such companies.  Moreover, foreign  companies are not  subject to  uniform
accounting,   auditing  and  financial   reporting  standards  and  requirements
comparable to those applicable to U.S. companies.
 
    Securities of foreign issuers may be less liquid than comparable  securities
of  U.S.  issuers  and, as  such,  their  price changes  may  be  more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to  less
government   and   exchange  scrutiny   and   regulation  than   their  American
counterparts. Brokerage commissions,  dealer concessions  and other  transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements  of  the  Fund's  trades  effected in  such  markets.  As  such, the
inability to  dispose of  portfolio securities  due to  settlement delays  could
result  in  losses to  the  Fund due  to subsequent  declines  in value  of such
securities and the inability of the Fund to make intended security purchases due
to settlement problems could result in a failure of the Fund to make potentially
advantageous investments.
 
REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which may
be viewed as a type of secured lending by the Fund, and which typically  involve
the  acquisition  by  the Fund  of  debt  securities, from  a  selling financial
institution such as a bank, savings  and loan association or broker-dealer.  The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a  fixed time in the future,  usually not more than seven  days from the date of
purchase. While repurchase agreements involve certain risks not associated  with
direct  investments  in  debt  securities, including  the  risks  of  default or
bankruptcy of the selling financial institution, the Fund follows procedures  to
minimize  such risks. These procedures include effecting repurchase transactions
only with large,  well-capitalized and  well-established financial  institutions
and maintaining adequate collateralization.
 
WHEN-ISSUED  AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From time
to time, in the ordinary course of business, the Fund may purchase securities on
a  when-issued   or   delayed  delivery   basis   or  may   purchase   or   sell
 
                                                                               7
<PAGE>
securities on a forward commitment basis. When such transactions are negotiated,
the  price is fixed at the time of  the commitment, but delivery and payment can
take place a month or more after the date of the commitment. There is no overall
limit on the  percentage of  the Fund's  assets which  may be  committed to  the
purchase  of securities on a when-issued, delayed delivery or forward commitment
basis. An  increase in  the percentage  of the  Fund's assets  committed to  the
purchase  of securities on a when-issued, delayed delivery or forward commitment
basis may increase the volatility of the Fund's net asset value. An increase  in
the percentage of the Fund's assets committed to the purchase of securities on a
when-issued  or delayed delivery basis may increase the volatility of the Fund's
net asset value.
 
WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a "when,
as and if issued" basis  under which the issuance  of the security depends  upon
the  occurrence of a subsequent  event, such as approval  of a merger, corporate
reorganization, leveraged buyout or debt restructuring. If the anticipated event
does not occur and  the securities are  not issued, the Fund  will have lost  an
investment  opportunity.  There is  no overall  limit on  the percentage  of the
Fund's assets which may be committed to  the purchase of securities on a  "when,
as  and if  issued" basis. An  increase in  the percentage of  the Fund's assets
committed to the purchase of securities on a "when, as and if issued" basis  may
increase the volatility of its net asset value.
 
INVESTMENT IN REAL ESTATE INVESTMENT TRUSTS.  The Fund may invest in real estate
investment  trusts,  which pool  investors' funds  for investments  primarily in
commercial real estate properties. Investment  in real estate investment  trusts
may  be the most  practical available means for  the Fund to  invest in the real
estate industry (the Fund is prohibited from investing in real estate directly).
As a shareholder  in a real  estate investment  trust, the Fund  would bear  its
ratable  share of  the real  estate investment  trust's expenses,  including its
advisory and administration fees.  At the same time  the Fund would continue  to
pay  its own investment management fees and other expenses, as a result of which
the Fund and its  shareholders in effect will  be absorbing duplicate levels  of
fees with respect to investments in real estate investment trusts.
 
ZERO  COUPON SECURITIES.  A portion  of the fixed-income securities purchased by
the Fund  may be  zero coupon  securities. Such  securities are  purchased at  a
discount from their face amount, giving the purchaser the right to receive their
full  value at maturity. The interest  earned on such securities is, implicitly,
automatically compounded and paid out at  maturity. While such compounding at  a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest  if  prevailing interest  rates  decline, the  owner  of a  zero coupon
security will be  unable to participate  in higher yields  upon reinvestment  of
interest  received on  interest-paying securities  if prevailing  interest rates
rise.
 
    A zero  coupon security  pays no  interest to  its holder  during its  life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive  current cash available  for distribution to  shareholders. In addition,
zero coupon securities are subject  to substantially greater price  fluctuations
during  periods  of  changing  prevailing  interest  rates  than  are comparable
securities which  pay interest  on  a current  basis.  Current federal  tax  law
requires  that a holder  (such as the Fund)  of a zero  coupon security accrue a
portion of the discount at which the security was purchased as income each  year
even  though the  Fund receives  no interest  payments in  cash on  the security
during the year.
 
PRIVATE PLACEMENTS.   The  Fund may  invest  up to  5% of  its total  assets  in
securities  which are  subject to restrictions  on resale because  they have not
been registered under the  Securities Act of 1933,  as amended (the  "Securities
Act"),  or which are otherwise not  readily marketable. (Securities eligible for
resale pursuant to  Rule 144A  under the Securities  Act, and  determined to  be
liquid  pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.)  These securities are generally  referred
to  as private placements or restricted securities. Limitations on the resale of
such securities  may have  an adverse  effect on  their marketability,  and  may
prevent  the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of  registering such securities for resale and  the
risk of substantial delays in effecting such registration.
 
    The  Securities  and Exchange  Commission has  adopted  Rule 144A  under the
Securities Act,  which  permits  the  Fund  to  sell  restricted  securities  to
qualified  institutional  buyers  without  limitation.  The  Investment Manager,
pursuant to  procedures  adopted  by the  Trustees  of  the Fund,  will  make  a
determination  as to the liquidity of  each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid," such security  will
not  be included within the category  "illiquid securities," which under current
policy may not exceed 10% of the  Fund's net assets. However, investing in  Rule
144A  securities  could  have  the  effect  of  increasing  the  level  of  Fund
illiquidity to the extent the Fund, at a particular point in time, may be unable
to find qualified institutional buyers interested in purchasing such securities.
 
OPTIONS AND FUTURE TRANSACTIONS.   The Fund may  purchase and sell (write)  call
and  put options  on portfolio securities  which are denominated  in either U.S.
dollars or foreign  currencies and on  the U.S. dollar  and foreign  currencies,
which  are or may in the future be listed on several U.S. and foreign securities
exchanges or are written in  over-the-counter transactions ("OTC options").  OTC
options   are  purchased  from  or  sold   (written)  to  dealers  or  financial
institutions which have entered into direct agreements with the Fund.
 
    The Fund is permitted to write covered call options on portfolio  securities
and the U.S. dollar and foreign
curren-
 
<PAGE>
cies,  without limit, in  order to hedge against  the decline in  the value of a
security or currency in which such security is denominated and to close out long
call option positions. The Fund may  write covered put options, under which  the
Fund  incurs  an obligation  to buy  the security  (or currency)  underlying the
option from the purchaser of the put at the option's exercise price at any  time
during the option period, at the purchaser's election.
 
    The  Fund  may purchase  listed  and OTC  call  and put  options  in amounts
equalling up to 5% of  its total assets. The Fund  may purchase call options  to
close out a covered call position or to protect against an increase in the price
of  a security it  anticipates purchasing or, in  the case of  call options on a
foreign currency,  to hedge  against  an adverse  exchange  rate change  of  the
currency  in  which  the  security  it  anticipates  purchasing  is  denominated
vis-a-vis the currency in which the exercise price is denominated. The Fund  may
purchase  put options on securities  which it holds in  its portfolio to protect
itself against a decline in the value  of the security and to close out  written
put  positions in a manner similar to call option closing purchase transactions.
There are  no other  limits  on the  Fund's ability  to  purchase call  and  put
options.
 
    The  Fund may purchase and sell futures contracts that are currently traded,
or may in  the future  be traded,  on U.S.  and foreign  commodity exchanges  on
underlying  portfolio securities, on any  currency ("currency" futures), on U.S.
and foreign  fixed-income  securities  ("interest rate"  futures)  and  on  such
indexes  of U.S. or  foreign equity or  fixed-income securities as  may exist or
come into being ("index" futures). The  Fund may purchase or sell interest  rate
futures  contracts for the  purpose of hedging some  or all of  the value of its
portfolio securities (or  anticipated portfolio securities)  against changes  in
prevailing interest rates. The Fund may purchase or sell index futures contracts
for  the  purpose  of hedging  some  or  all of  its  portfolio  (or anticipated
portfolio) securities against changes in their prices (or the currency in  which
they  are  denominated). As  a futures  contract purchaser,  the Fund  incurs an
obligation to take delivery of a  specified amount of the obligation  underlying
the  contract at  a specified  time in the  future for  a specified  price. As a
seller of  a futures  contract, the  Fund incurs  an obligation  to deliver  the
specified  amount of the underlying obligation at a specified time in return for
an agreed upon price.
 
    The Fund  also  may purchase  and  write call  and  put options  on  futures
contracts  which are traded  on an exchange and  enter into closing transactions
with respect to such options to terminate an existing position.
 
    New futures  contracts, options  and other  financial products  and  various
combinations  thereof continue to be developed. The  Fund may invest in any such
futures, options or products as may be developed, to the extent consistent  with
its investment objective and applicable regulatory requirements.
 
    The Fund may close out its position as writer of an option, or as a buyer or
seller  of a  futures contract,  only if  a liquid  secondary market  exists for
options or futures contracts of that series.  There is no assurance that such  a
market  will exist, particularly in the case of OTC options, as such options may
generally only be  closed out by  entering into a  closing purchase  transaction
with  the purchasing dealer. Also,  exchanges may limit the  amount by which the
price of many futures contracts may move on any day. If the price moves equal to
the daily limit on successive days, then it may prove impossible to liquidate  a
futures position until the daily limit moves have ceased.
 
    While the futures contracts and options transactions to be engaged in by the
Fund  for  the  purpose  of  hedging the  Fund's  portfolio  securities  are not
speculative in nature, there are risks inherent in the use of such  instruments.
One  such risk is that the Investment  Manager or Sub-Advisor could be incorrect
in its expectations as to  the direction or extent  of various interest rate  or
price  movements or  the time  span within which  the movements  take place. For
example, if  the Fund  sold futures  contracts  for the  sale of  securities  in
anticipation of an increase in interest rates, and then interest rates went down
instead,  causing bond prices  to rise, the  Fund would lose  money on the sale.
Another risk which will arise in employing futures contracts to protect  against
the  price volatility of portfolio securities  is that the prices of securities,
currencies and indexes  subject to  futures contracts (and  thereby the  futures
contract  prices) may correlate imperfectly with the behavior of the U.S. dollar
cash prices of the Fund's portfolio securities and their denominated currencies.
See the Statement of Additional Information for a further discussion of risks.
 
INVESTMENT IN OTHER INVESTMENT  VEHICLES.  Under the  Investment Company Act  of
1940, as amended, the Fund generally may invest up to 10% of its total assets in
the  aggregate in shares of other investment companies and up to 5% of its total
assets in any one investment company. The Fund  may not own more than 3% of  the
outstanding  voting  stock  of  any investment  company.  Investment  in foreign
investment companies may be the sole or  most practical means by which the  Fund
may  participate in certain  foreign securities markets,  and investment in real
estate investment trusts may be the most practical available means for the  Fund
to  invest in the real estate industry (the Fund is prohibited from investing in
real estate directly). As a shareholder in an investment company or real  estate
investment  trust,  the  Fund would  bear  its  ratable share  of  that entity's
expenses, including its advisory and administration  fees. At the same time  the
Fund  would  continue  to  pay  its own  investment  management  fees  and other
expenses, as a result of which the  Fund and its shareholders in effect will  be
absorbing  duplicate  levels  of  fees  with  respect  to  investments  in other
investment companies and in real estate investment trusts.
 
                                                                               9
<PAGE>
LENDING  OF  PORTFOLIO  SECURITIES.    Consistent  with  applicable   regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other  financial institutions, provided that such loans are callable at any time
by the Fund (subject to certain notice provisions described in the Statement  of
Additional  Information), and are at  all times secured by  cash or money market
instruments, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to  at least the market value, determined  daily,
of  the loaned securities. As with any  extensions of credit, there are risks of
delay in recovery and in some cases even loss of rights in the collateral should
the borrower of  the securities  fail financially. However,  loans of  portfolio
securities  will only be  made to firms  deemed by the  Investment Manager to be
creditworthy and when the income which  can be earned from such loans  justifies
the attendant risks.
 
    For  additional risk disclosure,  please refer to  the "Investment Objective
and Policies" section  of the Prospectus  and to the  "Investment Practices  and
Policies" section of the Statement of Additional Information.
 
PORTFOLIO MANAGEMENT
 
The  Fund's portfolio is actively managed by  its Investment Manager with a view
to achieving the Fund's investment objective. In determining which securities to
purchase for the Fund  or hold in the  Fund's portfolio, the Investment  Manager
will  rely on information from various sources, including research, analysis and
appraisals of brokers and dealers, the views of Trustees of the Fund and  others
regarding  economic developments  and interest  rate trends,  and the Investment
Manager's own analysis of  factors they deem relevant.  The Fund's portfolio  is
managed  within InterCapital's  Growth Group,  which manages  27 funds  and fund
portfolios, with approximately $12.1 billion in assets as of December 31,  1996.
Ronald   Worobel,  Senior  Vice  President  of  InterCapital  and  a  member  of
InterCapital's Growth Group, is  the primary portfolio manager  of the Fund  and
has  been  a portfolio  manager at  InterCapital  since June,  1992. He  was the
Managing  Director  at  MacKay  Schields   Financial  Corp.  before  coming   to
InterCapital.
 
    Personnel  of the Investment Manager have  substantial experience in the use
of the  investment techniques  described above  under the  heading "Options  and
Futures  Transactions,"  which techniques  require  skills different  from those
needed to select the portfolio securities underlying various options and futures
contracts.
 
    Orders for  transactions  in portfolio  securities  and commodities  may  be
placed  for  the Fund  with  a number  of  brokers and  dealers,  including DWR.
Pursuant to an  order of the  Securities and Exchange  Commission, the Fund  may
effect  principal  transactions in  certain money  market instruments  with Dean
Witter Reynolds  Inc.  ("DWR"),  a broker-dealer  affiliate  of  the  Investment
Manager.  In addition, the Fund may  incur brokerage commissions on transactions
conducted through DWR.
 
    Although the Fund does  not intend to engage  in short-term trading, it  may
sell  portfolio securities without regard  to the length of  time they have been
held when such sale will, in  the opinion of the Investment Manager,  contribute
to  the  Fund's investment  objective.  It is  not  anticipated that  the Fund's
portfolio turnover rate will exceed 300% in any one year.
 
    The Fund will incur brokerage costs commensurate with its portfolio turnover
rate. Short term gains and losses  may result from such portfolio  transactions.
See   "Dividends,  Distributions  and  Taxes"  for   a  discussion  of  the  tax
implications of the Fund's  trading policy. A more  extensive discussion of  the
Fund's  portfolio brokerage policies is set forth in the Statement of Additional
Information.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below  are among the restrictions which  have
been  adopted by the Fund as  fundamental policies. Under the Investment Company
Act of 1940, as  amended (the "Act"),  a fundamental policy  may not be  changed
without the vote of a majority of the outstanding voting securities of the Fund,
as  defined  in the  Act. For  purposes  of the  following limitations:  (i) all
percentage limitations apply immediately after a purchase or initial investment,
and (ii)  any subsequent  change  in any  applicable percentage  resulting  from
market  fluctuations or other  changes in total  or net assets  does not require
elimination of any security from the portfolio.
 
    The Fund may not:
 
        1. Invest  more  than  5% of  the  value  of its  total  assets  in  the
    securities  of any one issuer (other  than obligations issued, or guaranteed
    by, the United States Government, its agencies or instrumentalities).
 
        2. Invest 25% or more of the value of its total assets in securities  of
    issuers  in any one industry. This restriction does not apply to obligations
    issued or  guaranteed  by the  United  States Government,  its  agencies  or
    instrumentalities.
 
        3. Invest more than 5% of the value of its total assets in securities of
    issuers  having a  record, together  with predecessors,  of less  than three
    years of  continuous operation.  This  restriction shall  not apply  to  any
    obligation  issued  or  guaranteed  by  the  United  States  Government, its
    agencies or instrumentalities.
 
        4. The Fund may not, as to  75% of its total assets, purchase more  than
    10% of the voting securities of any issuer.
 
10
<PAGE>
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The  Fund  offers its  shares  for sale  to the  public  on a  continuous basis.
Pursuant  to  a  Distribution  Agreement  between  the  Fund  and  Dean   Witter
Distributors  Inc. (the "Distributor"), an  affiliate of the Investment Manager,
shares of the Fund  are distributed by  the Distributor and  offered by DWR  and
other  dealers  who  have  entered  into  selected  dealer  agreements  with the
Distributor ("Selected Broker-Dealers"). The  principal executive office of  the
Distributor is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Minimum subsequent purchases of $100
or  more  may  be  made by  sending  a  check, payable  to  Dean  Witter Capital
Appreciation Fund, directly to Dean Witter Trust Company (the "Transfer  Agent")
at P.O. Box 1040, Jersey City, NJ 07303 or by contacting an account executive of
DWR or other Selected Broker-Dealer. The minimum initial purchase in the case of
investments through EasyInvest-SM-, an automatic purchase plan (see "Shareholder
Services"),  is $100, provided  that the schedule  of automatic investments will
result in investments totalling at least $1,000 within the first twelve  months.
In  the  case  of investments  pursuant  to Systematic  Payroll  Deduction Plans
(including Individual Retirement Plans), the Fund, in its discretion, may accept
investments without  regard to  any  minimum amounts  which would  otherwise  be
required  if the  Fund has  reason to  believe that  additional investments will
increase the investment  in all accounts  under such Plans  to at least  $1,000.
Certificates for shares purchased will not be issued unless a request is made by
the shareholder in writing to the Transfer Agent. The offering price will be the
net  asset value per  share next determined  following receipt of  an order (see
"Determination of Net Asset Value").
 
    Shares of  the Fund  are sold  through  the Distributor  on a  normal  three
business day settlement basis; that is, payment is due on the third business day
(settlement  date) after the order is placed with the Distributor. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date,  they
will  benefit  from the  temporary use  of the  funds if  payment is  made prior
thereto. As noted above, orders placed directly with the Transfer Agent must  be
accompanied  by payment. Investors will be  entitled to receive income dividends
and capital  gains distributions  if their  order is  received by  the close  of
business   on  the  day  prior  to  the  record  date  for  such  dividends  and
distributions. While  no  sales  charge  is  imposed  at  the  time  shares  are
purchased,  a contingent  deferred sales  charge may be  imposed at  the time of
redemption (see "Redemptions and Repurchases"). Sales personnel are  compensated
for  selling shares  of the Fund  at the time  of their sale  by the Distributor
and/or the  Selected Broker-Dealer.  In addition,  some sales  personnel of  the
Selected  Broker-Dealer will receive  various types of  non-cash compensation as
special sales incentives, including trips, educational and/or business  seminars
and  merchandise. The Fund and  the Distributor reserve the  right to reject any
purchase orders.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
(the "Plan"), under which the Fund pays the Distributor a fee, which is  accrued
daily  and payable monthly, at an annual rate  of 1.0% of the lesser of: (a) the
average daily aggregate gross sales of the Fund's shares since the inception  of
the   Fund  (not   including  reinvestments   of  dividends   or  capital  gains
distributions), less the average daily aggregate  net asset value of the  Fund's
shares  redeemed since  the Fund's  inception upon  which a  contingent deferred
sales charge has been  imposed or waived;  or (b) the  Fund's average daily  net
assets. This fee is treated by the Fund as an expense in the year it is accrued.
 
    Amounts  paid  under  the Plan  are  paid  to the  Distributor  for services
provided  and  the  expenses  borne  by  the  Distributor  and  others  in   the
distribution  of the  Fund's shares,  including the  payment of  commissions for
sales of the  Fund's shares and  incentive compensation to  and expenses of  DWR
account executives and others who engage in or support distribution of shares or
who  service shareholder  accounts, including  overhead and  telephone expenses;
printing and distribution of  prospectuses and reports  used in connection  with
the  offering  of the  Fund's  shares to  other  than current  shareholders; and
preparation, printing  and  distribution  of sales  literature  and  advertising
materials.  In addition, the  Distributor may utilize fees  paid pursuant to the
Plan to compensate DWR and  other Selected Broker-Dealers for their  opportunity
costs  in advancing such amounts,  which compensation would be  in the form of a
carrying charge on any unreimbursed expenses.
 
    For the fiscal year ended November 30, 1996, the Fund accrued payments under
the Plan amounting to $2,065,176, which amount  is equal to 0.96% of the  Fund's
average  daily net assets  for the fiscal  year. The payments  accrued under the
Plan were calculated pursuant  to clause (a) of  the compensation formula  under
the  Plan. Of  the amount accrued  under the  Plan, 0.25% of  the Fund's average
daily net assets is characterized  as a service fee  within the meaning of  NASD
guidelines.  The service fee is  a payment made for  personal service and/or the
maintenance of shareholder accounts.
 
    At any given time, the expenses in distributing shares of the Fund may be in
excess of the total of (i) the payments  made by the Fund pursuant to the  Plan,
and  (ii) the  proceeds of contingent  deferred sales charges  paid by investors
upon the  redemption of  shares  (see "Redemptions  and  Repurchases--Contingent
Deferred  Sales Charge"). For example, if $1 million in expenses in distributing
shares of
 
                                                                              11
<PAGE>
the Fund had been incurred  and $750,000 had been  received as described in  (i)
and (ii) above, the excess expense would amount to $250,000. The Distributor has
advised  the Fund that the excess  distribution expenses (including the carrying
charge described above)  totalled $11,218,433  at November 30,  1996, which  was
equal to 3.61% of the Fund's net assets on such date.
 
    Because  there  is no  requirement under  the Plan  that the  Distributor be
reimbursed for all  distribution expenses or  any requirement that  the Plan  be
continued  from year to year, such excess  amount, if any, does not constitute a
liability of the Fund. Although there is no legal obligation for the Fund to pay
expenses incurred in excess of payments made to the Distributor under the  Plan,
and  the proceeds  of contingent deferred  sales charges paid  by investors upon
redemption of shares, if for any reason the Plan is terminated the Trustees will
consider at that time the manner in which to treat such expenses. Any cumulative
expenses incurred, but not yet recovered through distribution fees or contingent
deferred sales charges, may or may not be recovered through future  distribution
fees or contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund is determined once daily at 4:00 p.m.,
New York time, on each day that the New York Stock Exchange is open (or, on days
when  the New  York Stock Exchange  closes prior  to 4:00 p.m.,  at such earlier
time), by  taking the  value of  all assets  of the  Fund, subtracting  all  its
liabilities,  dividing by the number of  shares outstanding and adjusting to the
nearest cent. The  net asset  value per  share will  not be  determined on  Good
Friday and on such other federal and non-federal holidays as are observed by the
New York Stock Exchange.
 
    In  the calculation of the  Fund's net asset value:  (1) an equity portfolio
security listed or traded on  the New York or  American Stock Exchange or  other
domestic  or foreign stock exchange  is valued at its  latest sale price on that
exchange, prior to the time assets are valued; if there were no sales that  day,
the  security is valued  at the latest bid  price (in cases  where a security is
traded on  more  than one  exchange,  the security  is  valued on  the  exchange
designated  as  the  primary  market  pursuant  to  procedures  adopted  by  the
Trustees); and (2)  all other  portfolio securities  for which  over-the-counter
market quotations are readily available are valued at the latest bid price. When
market quotations are not readily available, including circumstances under which
it  is determined  by the Investment  Manager that  sale and bid  prices are not
reflective of  a security's  market value,  portfolio securities  are valued  at
their fair value as determined in good faith under procedures established by and
under  the general supervision of the Board of Trustees. For valuation purposes,
quotations of foreign  portfolio securities,  other assets  and liabilities  and
forward  contracts stated  in foreign currency  are translated  into U.S. dollar
equivalents at the prevailing market  rates prior to the  close of the New  York
Stock  Exchange. Dividends receivable are accrued  as of the ex-dividend date or
as of the time that the relevant ex-dividend date and amounts become known.
 
    Short-term debt securities with remaining  maturities of sixty days or  less
at  the  time of  purchase are  valued  at amortized  cost, unless  the Trustees
determine such does  not reflect  the securities'  market value,  in which  case
these  securities  will be  valued  at their  fair  value as  determined  by the
Trustees.
 
    Certain of  the Fund's  portfolio securities  may be  valued by  an  outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a  matrix  system incorporating  security quality,  maturity  and coupon  as the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is the  fair  valuation of  the  portfolio  securities valued  by  such  pricing
service.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC  INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.   All income dividends and
capital gains distributions are automatically paid in full and fractional shares
of the Fund (or, if specified by the shareholder, any other open-end  investment
company  for which InterCapital serves as investment manager (collectively, with
the Fund, the "Dean Witter Funds")),  unless the shareholder requests that  they
be  paid in  cash. Shares  as acquired are  not subject  to the  imposition of a
contingent deferred sales  charge upon  their redemption  (see "Redemptions  and
Repurchases").
 
INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives  a cash payment  representing a dividend  or capital gains distribution
may invest such dividend or distribution at  the net asset value per share  next
determined  after receipt by the  Transfer Agent, by returning  the check or the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so acquired are  not subject to  the imposition of  a contingent deferred  sales
charge upon their redemption (see "Redemptions and Repurchases").
 
EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan  which  provides for  any  amount from  $100  to $5,000  to  be transferred
automatically from a checking or savings account, on a semi-monthly, monthly  or
quarterly basis, to the Transfer Agent for investment in shares of the Fund (see
"Purchase  of  Fund  Shares"  and "Redemptions  and  Repurchases  -- Involuntary
Redemption").
 
12
<PAGE>
SYSTEMATIC WITHDRAWAL  PLAN.   A  systematic  withdrawal plan  (the  "Withdrawal
Plan")  is available  for shareholders  who own or  purchase shares  of the Fund
having a minimum value of $10,000 based  upon the then current net asset  value.
The  Withdrawal Plan provides  for monthly or  quarterly (March, June, September
and December) checks in any  dollar amount, not less than  $25, or in any  whole
percentage  of  the  account balance,  on  an annualized  basis.  Any applicable
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (See "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). Therefore, any shareholder participating  in the Withdrawal Plan  will
have  sufficient shares redeemed  from his or  her account so  that the proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Withdrawal Plan payments should  not be considered  as dividends, yields  or
income.  If periodic withdrawal plan payments continuously exceed net investment
income and  net capital  gains, the  shareholder's original  investment will  be
correspondingly reduced and ultimately exhausted.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX-SHELTERED RETIREMENT  PLANS.   Retirement  plans are  available for  use  by
corporations,  the self-employed,  Individual Retirement  Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of  such
plans should be on advice of legal counsel or tax adviser.
 
    For  further information  regarding plan administration,  custodial fees and
other details,  investors should  contact  their DWR  or other  Selected  Dealer
account executive or the Transfer Agent.
 
EXCHANGE PRIVILEGE
 
The  Fund makes available  to its shareholders  an "Exchange Privilege" allowing
the exchange of shares of  the Fund for shares of  other Dean Witter Funds  sold
with  a contingent deferred sales charge ("CDSC  funds"), and for shares of Dean
Witter Short-Term U.S. Treasury  Trust, Dean Witter  Short-Term Bond Fund,  Dean
Witter  Limited Term  Municipal Trust,  Dean Witter  Balanced Growth  Fund, Dean
Witter Balanced Income Fund, Dean  Witter Intermediate Term U.S. Treasury  Trust
and  five Dean Witter Funds  which are money market  funds (the foregoing eleven
non-CDSC funds  are  hereinafter  collectively  referred  to  as  the  "Exchange
Funds"). Exchanges may be made after the shares of the Fund acquired by purchase
(not by exchange or dividend reinvestment) have been held for thirty days. There
is  no waiting period for  exchanges of shares acquired  by exchange or dividend
reinvestment.
 
    An exchange to another CDSC fund or to any Exchange Fund that is not a money
market fund is on the basis of the next calculated net asset value per share  of
each  fund after the  exchange order is  received. When exchanging  into a money
market fund from the Fund,  shares of the Fund are  redeemed out of the Fund  at
their  next calculated net  asset value and  the proceeds of  the redemption are
used to  purchase  shares of  the  money market  fund  at the  net  asset  value
determined  the following business day. Subsequent  exchanges between any of the
money market funds and any of the CDSC funds can be effected on the same  basis.
No  contingent deferred  sales charge  ("CDSC") is  imposed at  the time  of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different CDSC schedule  than that  of this  Fund will  be subject  to the  CDSC
schedule  of this  Fund, even if  such shares are  subsequently re-exchanged for
shares of the  CDSC fund  originally purchased. During  the period  of time  the
shareholder  remains in the Exchange  Fund (calculated from the  last day of the
month in which the Exchange Fund shares were acquired), the holding period  (for
the  purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently  reexchanged  for  shares  of  a  CDSC  fund,  the  holding  period
previously  frozen when the first  exchange was made resumes  on the last day of
the month in which shares of a CDSC fund are reacquired. Thus, the CDSC is based
upon the time (calculated as described above) the shareholder was invested in  a
CDSC fund (see "Redemptions and Repurchases--Contingent Deferred Sales Charge").
However,  in  the  case  of  shares exchanged  into  an  Exchange  Fund,  upon a
redemption of shares which  results in a  CDSC being imposed,  a credit (not  to
exceed  the amount of the CDSC) will be given in an amount equal to the Exchange
Fund  12b-1  distribution  fees  incurred  on  or  after  that  date  which  are
attributable  to  those  shares.  (Exchange  Fund  12b-1  distribution  fees are
described in the prospectuses for those funds.)
 
    In addition, shares of the  Fund may be acquired  in exchange for shares  of
Dean  Witter Funds sold  with a front-end sales  charge ("front-end sales charge
funds"), but shares  of the  Fund, however acquired,  may not  be exchanged  for
shares  of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired in
exchange for shares of a front-end sales charge fund (or in exchange for  shares
of  other Dean Witter  Funds for which  shares of a  front-end sales charge fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    Purchases and  exchanges should  be  made for  investment purposes  only.  A
pattern  of frequent  exchanges may  be deemed by  the Investment  Manager to be
abusive and contrary to the best interests of the Fund's other shareholders and,
at the Investment Manager's discretion, may be limited by the Fund's refusal  to
accept  additional purchases  and/or exchanges  from the  investor. Although the
Fund does not have any specific definition of what
 
                                                                              13
<PAGE>
constitutes a  pattern of  frequent exchanges,  and will  consider all  relevant
factors in determining whether a particular situation is abusive and contrary to
the  best interests of the Fund and  its other shareholders, investors should be
aware that  the Fund  and each  of  the other  Dean Witter  Funds may  in  their
discretion  limit  or  otherwise  restrict the  number  of  times  this Exchange
Privilege may be exercised by any investor. Any such restriction will be made by
the Fund on a prospective basis only,  upon notice of the shareholder not  later
than  ten  days following  such shareholder's  most  recent exchange.  Also, the
Exchange Privilege may be terminated or revised  at any time by the Fund  and/or
any  of such Dean Witter Funds for which shares of the Fund have been exchanged,
upon  such  notice  as  may  be  required  by  applicable  regulatory  agencies.
Shareholders  maintaining margin accounts  with DWR or  another Selected Broker-
Dealer are  referred  to  their  account  executive  regarding  restrictions  on
exchange of shares of the Fund pledged in the margin account.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and  shareholders should obtain  a copy and  examine it  carefully
before  investing. Exchanges are  subject to the  minimum investment requirement
and any other conditions imposed  by each fund. In  the case of any  shareholder
holding  a share certificate or certificates, no exchanges may be made until all
applicable share  certificates have  been  received by  the Transfer  Agent  and
deposited  in the Shareholder's account. An exchange will be treated for federal
income tax purposes the same as a  repurchase or redemption of shares, on  which
the  shareholder may  realize a  capital gain or  loss. However,  the ability to
deduct capital losses on an exchange may be limited in situations where there is
an exchange of  shares within ninety  days after the  shares are purchased.  The
Exchange  Privilege is only available in states where an exchange may legally be
made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account  numbers  are part  of  the account  information,  shareholders  may
initiate  an exchange of shares of the Fund for shares of any of the Dean Witter
Funds (for which the Exchange Privilege is available) pursuant to this  Exchange
Privilege   by  contacting  their  account   executive  (no  Exchange  Privilege
Authorization Form is required). Other shareholders (and those shareholders  who
are  clients  of DWR  or another  Selected  Broker-Dealer but  who wish  to make
exchanges directly by writing or  telephoning the Transfer Agent) must  complete
and  forward to  the Transfer  Agent an  Exchange Privilege  Authorization Form,
copies of  which  may  be obtained  from  the  Transfer Agent,  to  initiate  an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The  Fund  will  employ  reasonable  procedures  to  confirm  that  exchange
instructions communicated over  the telephone are  genuine. Such procedures  may
include requiring various forms of personal identification such as name, mailing
address,  social security  or other tax  identification number and  DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may  also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent  between 9:00 a.m. and 4:00  p.m., New York time, on  any day the New York
Stock Exchange is  open. Any shareholder  wishing to make  an exchange, who  has
previously  filed an Exchange Privilege Authorization  Form and who is unable to
reach the Fund by  telephone, should contact  his or her  DWR or other  Selected
Broker-Dealer  account  executive, if  appropriate, or  make a  written exchange
request. Shareholders are  advised that  during periods of  drastic economic  or
market  changes, it  is possible that  the telephone exchange  procedures may be
difficult to implement, although this has not been the experience with the  Dean
Witter Funds in the past.
 
    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
REDEMPTION.   Shares of the Fund can be redeemed for cash at any time at the net
asset value per share next determined; however, such redemption proceeds may  be
reduced  by the amount of any  applicable contingent deferred sales charges (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  share
certificate,  a written request for redemption sent to the Fund's Transfer Agent
at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held  by
the  shareholder(s), the shares may be redeemed by surrendering the certificates
with a written  request for  redemption, along with  any additional  information
required by the Transfer Agent.
 
CONTINGENT  DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased)  will not be subject  to any charge upon  redemption.
Shares redeemed sooner than six years after purchase may, however, be subject to
a  charge upon  redemption. This charge  is called a  "contingent deferred sales
charge" ("CDSC"), which  will be  a percentage of  the dollar  amount of  shares
redeemed  and will be assessed  on an amount equal to  the lesser of the current
market value  or  the cost  of  the shares  being  redeemed. The  size  of  this
 
14
<PAGE>
percentage  will depend upon how long the shares have been held, as set forth in
the table below:
 
<TABLE>
<CAPTION>
                                               CONTINGENT
                                                DEFERRED
               YEAR SINCE                     SALES CHARGE
                PURCHASE                   AS A PERCENTAGE OF
              PAYMENT MADE                  AMOUNT REDEEMED
- -----------------------------------------  ------------------
<S>                                        <C>
First....................................         5.0%
Second...................................         4.0%
Third....................................         3.0%
Fourth...................................         2.0%
Fifth....................................         2.0%
Sixth....................................         1.0%
Seventh and thereafter...................         None
</TABLE>
 
    A CDSC will not be imposed on:  (i) any amount which represents an  increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six years prior to the
redemption;  and (iii) the  current net asset value  of shares purchased through
reinvestment of dividends  or distributions and/or  shares acquired in  exchange
for  shares of Dean Witter Funds sold with  a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether a CDSC is applicable it will  be assumed that amounts described in  (i),
(ii)  and (iii) above (in  that order) are redeemed  first. In addition, no CDSC
will be imposed on redemptions of shares which are attributable to  reinvestment
of  dividends or distributions from, or the proceeds of, certain Unit Investment
Trusts.
 
    In addition, the CDSC, if otherwise  applicable, will be waived in the  case
of:
 
    (1)  redemptions of shares  held at the  time a shareholder  dies or becomes
disabled, only  if the  shares are:  (A) registered  either in  the name  of  an
individual  shareholder (not a trust),  or in the names  of such shareholder and
his or her spouse as joint tenants with right of survivorship; or (B) held in  a
qualified  corporate  or  self-employed retirement  plan,  Individual Retirement
Account ("IRA") or  Custodial Account  under Section 403(b)(7)  of the  Internal
Revenue  Code ("403(b)  Custodial Account"),  provided in  either case  that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)  redemptions   in  connection   with  the   following  retirement   plan
distributions: (A) lump-sum or other distributions from a qualified corporate or
self-employed  retirement plan following  retirement (or, in the  case of a "key
employee" of  a "top  heavy" plan,  following  attainment of  age 59  1/2);  (B)
distributions  from an IRA  or 403(b) Custodial  Account following attainment of
age 59 1/2; or (C) a tax-free return of an excess contribution to an IRA; and
 
    (3) all redemptions of  shares held for  the benefit of  a participant in  a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal   Revenue  Code  which  offers  investment  companies  managed  by  the
Investment Manager  or its  subsidiary, Dean  Witter Services  Company Inc.,  as
self-directed investment alternatives and for which Dean Witter Trust Company or
Dean  Witter Trust FSB, each of which is an affiliate of the Investment Manager,
serves as Trustee ("Eligible 401(k) Plan"),  provided that either: (A) the  plan
continues  to  be an  Eligible  401(k) Plan  after  the redemption;  or  (B) the
redemption is in connection with the complete termination of the plan  involving
the distribution of all plan assets to participants.
 
    With  reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section  72(m)(7)
of  the  Internal Revenue  Code, which  relates  to the  inability to  engage in
gainful employment. With reference  to (2) above,  the term "distribution"  does
not  encompass a direct transfer of  IRA, 403(b) Custodial Account or retirement
plan assets to  a successor custodian  or trustee. All  waivers will be  granted
only  following receipt by the Distributor  of confirmation of the shareholder's
entitlement.
 
REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to  repurchase
shares  represented by a  share certificate which  is delivered to  any of their
offices. Shares held in a shareholder's account without a share certificate  may
also be repurchased by DWR and other Selected Broker-Dealers upon the telephonic
or telegraphic request of the shareholder. The repurchase price is the net asset
value  next computed (see "Purchase of Fund Shares") after such repurchase order
is received by DWR  or other Selected Broker-Dealer,  reduced by any  applicable
CDSC.
 
    The  CDSC, if  any, will  be the only  fee imposed  by either  the Fund, the
Distributor or DWR or other Selected  Broker-Dealer. The offer by DWR and  other
Selected  Broker-Dealers to repurchase shares may be suspended without notice by
the Distributor at any time. In that event, shareholders may redeem their shares
through the Fund's Transfer Agent as set forth above under "Redemption."
 
PAYMENT FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented  for
repurchase  or redemption will be made by  check within seven days after receipt
by the Transfer Agent of the  certificate and/or written request in good  order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances;  E.G., when normal  trading is not  taking place on  the New York
Stock Exchange. If  the shares to  be redeemed have  recently been purchased  by
check,  payment of the redemption  proceeds may be delayed  for the minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders  maintaining  margin   accounts  with  DWR   or  another   Selected
Broker-Dealer  are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or repurchased and has not
 
                                                                              15
<PAGE>
previously  exercised this reinstatement privilege may, within thirty days after
the date of the redemption  or repurchase, reinstate any  portion or all of  the
proceeds  of such redemption  or repurchase in  shares of the  Fund at their net
asset value next  determined after  a reinstatement request,  together with  the
proceeds,  is received by the  Transfer Agent and receive  a pro-rata credit for
any CDSC paid in connection with such redemption or repurchase.
 
INVOLUNTARY REDEMPTION.  The Fund reserves  the right to redeem, on sixty  days'
notice  and at net asset value, the shares of any shareholder (other than shares
held in  an Individual  Retirement Account  or Custodial  Account under  Section
403(b)(7)  of the Internal Revenue Code) whose  shares due to redemptions by the
shareholder have a value of less than $100 or such lesser amount as may be fixed
by the Trustees or, in the case of an account opened through EasyInvest-SM-,  if
after  twelve  months  the shareholder  has  invested  less than  $1,000  in the
account. However, before the Fund redeems such shares and sends the proceeds  to
the  shareholder, it will notify the shareholder that the value of the shares is
less than the  applicable amount  and allow  him or her  sixty days  to make  an
additional  investment in an amount which will  increase the value of his or her
account to at least the applicable amount before the redemption is processed. No
CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS AND  DISTRIBUTIONS.    The  Fund  intends  to  pay  dividends  and  to
distribute substantially all of its net investment income and distribute capital
gains,  if  any, once  each year.  The  Fund may,  however, determine  either to
distribute or to retain all or part  of any long-term capital gains in any  year
for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
Fund  shares  and automatically  credited to  the shareholder's  account without
issuance of a share certificate unless the shareholder requests in writing  that
all   dividends  and/or  distributions  be   paid  in  cash.  (See  "Shareholder
Services--Automatic Investment of Dividends and Distributions".)
 
TAXES.  Because the Fund intends to distribute all of its net investment  income
and  net short-term  capital gains  to shareholders  and otherwise  qualify as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the Fund will be required to pay any Federal income tax  on
any  such  income and  capital  gains. Shareholders  will  normally have  to pay
Federal income taxes, and any state and local income taxes, on the dividends and
distributions they receive from the Fund.
 
    Distributions of net investment income and net short-term capital gains  are
taxable to the shareholder as ordinary dividend income regardless of whether the
shareholder  receives such distributions  in additional shares  or in cash. Some
part of  such  dividends and  distributions  may  be eligible  for  the  Federal
dividends received deduction available to the Fund's corporate shareholders.
 
    Distributions  of  net  long-term  capital gains,  if  any,  are  taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital  gains distributions are not eligible  for
the dividends received deduction.
 
    The  Fund may at times  make payments from sources  other than income or net
capital gains. Payments from such sources will, in effect, represent a return of
a portion of each shareholder's investment. All, or a portion, of such  payments
will not be taxable to shareholders.
 
    After  the  end  of  the  calendar  year,  shareholders  will  be  sent full
information on their dividends and capital gains distributions for tax purposes.
To avoid  being subject  to a  31%  Federal backup  withholding tax  on  taxable
dividends,  capital  gains distributions  and  the proceeds  of  redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy.
 
    Dividends, interest  and  gains  received  by the  Fund  may  give  rise  to
withholding  and other taxes  imposed by foreign countries.  If it qualifies for
and makes the appropriate election with  the Internal Revenue Service, the  Fund
will  report annually to its shareholders the  amount per share of such taxes to
enable shareholders to  claim United  States foreign tax  credits or  deductions
with  respect to such taxes. In the absence  of such an election, the Fund would
deduct foreign tax in computing the amount of its distributable income.
 
    Shareholders should consult their  tax advisers as  to the applicability  of
the foregoing to their current situation.
 
16
<PAGE>
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From  time to time the  Fund may quote its  "total return" in advertisements and
sales literature. The total return of  the Fund is based on historical  earnings
and is not intended to indicate future performance.
 
    The  "average annual total return" of the Fund refers to a figure reflecting
the average annualized  percentage increase  (or decrease)  in the  value of  an
initial  investment in  the Fund  of $1,000  over periods  of one,  five and ten
years, or over the life of the Fund, if less than any of the foregoing.  Average
annual  total return reflects all income earned by the Fund, any appreciation or
depreciation of the  Fund's assets, all  expenses incurred by  the Fund and  all
sales  charges incurred by shareholders, for the stated periods. It also assumes
reinvestment of all dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the  Fund may advertise its total return  over
different  periods of time  by means of aggregate,  average, and year-by-year or
other types of total return figures. The  Fund may also advertise the growth  of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
Such  calculations  may  or may  not  reflect  the deduction  of  the contingent
deferred sales charge which, if reflected, would reduce the performance  quoted.
The  Fund  from time  to time  may  also advertise  its performance  relative to
certain performance rankings and  indexes compiled by independent  organizations
such  as mutual fund  performance rankings of  Lipper Analytical Services, Inc.,
the S&P Stock Index and the Dow Jones Industrial Average.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING RIGHTS.  All shares of beneficial  interest of the Fund are of $0.01  par
value  and are equal as to earnings,  assets and voting privileges. There are no
conversion, pre-emptive  or  other  subscription  rights.  In  the  event  of  a
liquidation,  each share of beneficial  interest of the Fund  is entitled to its
portion of all the Fund's  assets after all debts  and expenses have been  paid.
The shares do not have cumulative voting rights.
 
    The  Fund is not  required to hold  Annual Meetings of  Shareholders and, in
ordinary circumstances, the  Fund does  not intend  to hold  such meetings.  The
Trustees  may call  Special Meetings of  Shareholders for  action by shareholder
vote as may be required  by the Act or the  Declaration of Trust. Under  certain
circumstances  the Trustees may be  removed by action of  the Trustees or by the
shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be  held personally  liable as  partners for  obligations of  the
Fund.  However,  the  Declaration of  Trust  contains an  express  disclaimer of
shareholder liability for acts  or obligations of the  Fund, requires that  Fund
obligations  include  such  disclaimer,  and  provides  for  indemnification and
reimbursement of expenses out  of the Fund's property  for any shareholder  held
personally  liable  for  the  obligations  of the  Fund.  Thus,  the  risk  of a
shareholder incurring  financial loss  on account  of shareholder  liability  is
limited  to circumstances in which  the Fund itself would  be unable to meet its
obligations. Given the above limitations on shareholder personal liability,  and
the  nature of the Fund's assets and operations, in the opinion of Massachusetts
counsel to the Fund, the risk to shareholders of personal liability is remote.
 
CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean  Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted  by those companies. The  Code of Ethics is  intended to ensure that the
interests of shareholders  and other clients  are placed ahead  of any  personal
interest,  that no undue personal benefit is obtained from a person's employment
activities and that actual and potential  conflicts of interest are avoided.  To
achieve  these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an  advance clearance process to monitor that  no
Dean  Witter Fund is engaged at the same time  in a purchase or sale of the same
security. The  Code of  Ethics bans  the purchase  of securities  in an  initial
public offering, and also prohibits engaging in futures and options transactions
and  profiting on short-term trading (that is, a purchase within sixty days of a
sale or a  sale within sixty  days of a  purchase) of a  security. In  addition,
investment  personnel may  not purchase  or sell  a security  for their personal
account within thirty days  before or after any  transaction in any Dean  Witter
Fund  managed  by them.  Any violations  of the  Code of  Ethics are  subject to
sanctions,  including  reprimand,  demotion  or  suspension  or  termination  of
employment.  The Code  of Ethics comports  with regulatory  requirements and the
recommendations in the 1994 report by the Investment Company Institute  Advisory
Group on Personal Investing.
 
SHAREHOLDER  INQUIRIES.  All inquiries regarding  the Fund should be directed to
the Fund at the  telephone numbers or  address set forth on  the front cover  of
this Prospectus.
 
                                                                              17
<PAGE>
 
DEAN WITTER
CAPITAL APPRECIATION FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Ronald J. Worobel
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center,
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.
<PAGE>
                      (This page intentionally left blank)
<PAGE>

                        DEAN WITTER CAPITAL APPRECIATION FUND
                                Two World Trade Center
                              New York, New York  10048
                                   (212)  392-1600


                                                      February 4, 1997



Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549



Re: Dean Witter Capital Appreciation Fund
    File No.  33-61511
    --------------------------------------


Dear Sir or Madam:

    We are electronically transmitting via EDGAR, pursuant to Rule 497(e) under
the Securities Act of 1933, a copy of an additional form of Prospectus of the
Registrant dated January 28, 1997.


                                                      Very truly yours,
                                                      /s/ Frank J. Bruttomesso
                                                      -------------------------
                                                      Frank J. Bruttomesso
                                                      Assistant Secretary



Enclosures
cc: Randolph Koch
    Sheldon Curtis



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