DEAN WITTER MID CAP GROWTH FUND
497, 1997-07-31
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<PAGE>
                                                Filed Pursuant to Rule 497(c)
                                                Registration File No.: 33-53955
 
PROSPECTUS -- JULY 28, 1997
- ------------------------------------------------------------------------------
 

Dean Witter Mid-Cap Growth Fund (the "Fund") is an open-end, diversified
management investment company whose investment objective is to seek long-term
capital growth. The Fund seeks to meet its investment objective by investing
primarily in equity securities of "mid-cap" companies.

 
The Fund offers four classes of shares (each, a "Class"), each with a different
combination of sales charges, ongoing fees and other features. The different
distribution arrangements permit an investor to choose the method of purchasing
shares that the investor believes is most beneficial given the amount of the
purchase, the length of time the investor expects to hold the shares and other
relevant circumstances. Shares of the Fund held prior to July 28, 1997 have
been designated Class B shares. (See "Purchase of Fund Shares-- Alternative
Purchase Arrangements.")

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 July 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.
 
Dean Witter
Mid-Cap Growth Fund
Two World Trade Center
New York, New York 10048
(212) 392-2550 or 
(800) 869-NEWS (toll-free)

 
TABLE OF CONTENTS

Prospectus Summary/ 2
Summary of Fund Expenses/ 4
Financial Highlights/ 6
The Fund and its Management/ 7
Investment Objective and Policies/ 7
Risk Considerations/ 14
Investment Restrictions/ 15
Purchase of Fund Shares/ 16
Shareholder Services/ 27
Redemptions and Repurchases/ 30
Dividends, Distributions and Taxes/ 31
Performance Information/ 32
Additional Information/ 32
 

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 Mid-Cap Growth Fund Two World Trade Center New York, New York 10048
(212) 392-2550 or (800) 869-NEWS (toll-free)

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 NOR 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>
<CAPTION>
<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 equity
                   securities of "mid-cap" companies.
- -------------------------------------------------------------------------------------------------------------------
Shares Offered     Shares of beneficial interest with $.01 par value (see page 32). The Fund offers four Classes of
                   shares, each with a different combination of sales charges,
                   ongoing fees and other features (see pages 16-26).
- -------------------------------------------------------------------------------------------------------------------
Minimum            The minimum initial investment for each Class is $1,000 ($100 if the account is opened through
Purchase           EasyInvestSM). Class D shares are only available to persons investing $5 million or more and to
                   certain other limited categories of investors. For the purpose of meeting the minimum $5 million
                   investment for Class D shares, and subject to the $1,000 minimum initial investment for each
                   Class of the Fund, an investor's existing holdings of Class A shares and shares of funds for
                   which Dean Witter InterCapital Inc. serves as investment manager ("Dean Witter Funds") that are
                   sold with a front-end sales charge, and concurrent investments in Class D shares of the Fund and
                   other Dean Witter Funds that are multiple class funds, will
                   be aggregated. The minimum subsequent investment is $100
                   (see page 16).
- -------------------------------------------------------------------------------------------------------------------
Investment         The investment objective of the Fund is long-term capital growth.
Objective
- -------------------------------------------------------------------------------------------------------------------
Investment         Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund, and its
Manager            wholly-owned subsidiary, Dean Witter Services Company Inc., serve in various investment
                   management, advisory, management and administrative capacities to 100 investment companies and
                   other portfolios with net assets under management of approximately $96.6 billion at June 30, 1997.
- -------------------------------------------------------------------------------------------------------------------
Management         The Investment Manager receives a monthly fee at the annual rate of 0.75% of the portion of the 
Fee                Fund's average daily net assets not exceeding $500 million and 0.725% of the portion of daily 
                   net assets exceeding $500 million. The fee should not be compared with fees paid by other
                   investment companies without also considering applicable sales loads and distribution fees, 
                   including those noted below (see page 7).
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Distributor        Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution plan
and                pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan") with respect to the
Distribution       distribution fees paid by the Class A, Class B and Class C shares of the Fund to the
Fee                Distributor. The entire 12b-1 fee payable by Class A and a portion of the 12b-1 fee payable by
                   each of Class B and Class C equal to 0.25% of the average daily net assets of the Class are 
                   currently each characterized as a service fee within the meaning of the National Association 
                   of Securities Dealers, Inc. guidelines. The remaining portion of the 12b-1 fee, if any, is
                   characterized as an asset-based sales charge (see pages 16 and 25).
- -------------------------------------------------------------------------------------------------------------------
Alternative        Four classes of shares are offered:
Purchase           o Class A shares are offered with a front-end sales charge, starting at 5.25% and reduced for 
Arrangements       larger purchases. Investments of $1 million or more (and investments by certain other limited
                   categories of investors) are not subject to any sales charge at the time of purchase but a 
                   contingent deferred sales charge ("CDSC") of 1.0% may be imposed on redemptions within
                   one year of purchase. The Fund is authorized to reimburse the Distributor for specific expenses 
                   incurred in promoting the distribution of the Fund's Class A shares and servicing shareholder 
                   accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to
                   payments at an annual rate of 0.25% of average daily net assets of the Class (see pages 16,19 and 25).

                                2

<PAGE>
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                          o Class B shares are offered without a front-end sales charge, but will in       
                          most cases be subject to a CDSC (scaled down from 5.0% to 1.0%) if redeemed
                          within six years after purchase. The CDSC will be imposed on any redemption of
                          shares if after such redemption the aggregate current value of a Class B
                          account with the Fund falls below the aggregate amount of the investor's
                          purchase payments made during the six years preceding the redemption. A
                          different CDSC schedule applies to investments by certain qualified plans.
                          Class B shares are also subject to a 12b-1 fee assessed at the annual rate of
                          1.0% of the lesser of: (a) the average daily net sales of the Fund's Class B
                          shares or (b) the average daily net assets of Class B. All shares of the Fund
                          held prior to July 28, 1997 have been designated Class B shares. Shares held
                          before May 1, 1997 will convert to Class A shares in May, 2007. In all other
                          instances, Class B shares convert to Class A shares approximately ten years
                          after the date of the original purchase (see pages 16, 21 and 25). 

                          o Class C shares are offered without a front-end sales charge, but will in most cases 
                          be subject to a CDSC of 1.0% if redeemed within one year after purchase. The Fund
                          is authorized to reimburse the Distributor for specific expenses incurred in
                          promoting the distribution of the Fund's Class C shares and servicing
                          shareholder accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no
                          event exceed an amount equal to payments at an annual rate of 1.0% of average
                          daily net assets of the Class (see pages 16, 24 and 25). 

                          o Class D shares are offered only to investors meeting an initial investment 
                          minimum of $5 million and to certain other limited categories of investors. 
                          Class D shares are offered without a front-end sales charge or CDSC and are 
                          not subject to any 12b-1 fee (see pages 16, 24 and 25).
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Dividends                 Dividends from net investment income and distributions from net capital gains, if any, are
and Capital               paid at least annually. The Fund may, however, determine to retain all or part of any net 
Gains                     long-term capital gains in any year for reinvestment. Dividends and capital gains distributions 
Distributions             paid on shares of a Class are automatically reinvested in additional shares of the same Class 
                          at net asset value unless the shareholder elects to receive cash. Shares acquired by
                          dividend and distribution reinvestment will not be subject
                          to any sales charge or CDSC (see pages 27 and 31).
- -------------------------------------------------------------------------------------------------------------------
Redemption                Shares are redeemable by the shareholder at net asset value
                          less any applicable CDSC on Class A, Class B or Class C
                          shares. An account may be involuntarily redeemed if the
                          total value of the account is less than $100 or, if the
                          account was opened through EasyInvestSM, if after twelve
                          months the shareholder has invested less than $1,000 in the
                          account (see page 30).
- -------------------------------------------------------------------------------------------------------------------
Risk                      The net asset value of the Fund's shares will fluctuate with changes in the market value of
Considerations            portfolio securities. Investing in medium-sized market capitalization companies may involve
                          greater risk of volatility in the Fund's net asset value than is customarily associated with
                          investing in larger, more established companies. In addition, it should be recognized that the
                          foreign securities and markets in which the Fund may invest up to 35% of its total assets pose
                          different and greater risks than those customarily associated with domestic securities and 
                          their markets (see pages 7-16).
- -------------------------------------------------------------------------------------------------------------------
</TABLE>
 

  The above is qualified in its entirety by the detailed information appearing
  elsewhere in this Prospectus and in the Statement of Additional Information.

                                3
<PAGE>
SUMMARY OF FUND EXPENSES
- -----------------------------------------------------------------------------

 
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 based on the
expenses and fees for the fiscal year ended May 31, 1997.
 

 
<TABLE>
<CAPTION>
                                                      CLASS A      CLASS B      CLASS C      CLASS D
                                                   ------------ ------------ ------------ -----------
<S>                                                <C>          <C>          <C>          <C>
Shareholder Transaction Expenses
- --------------------------------
Maximum Sales Charge Imposed on Purchases (as a
 percentage of offering price) ....................     5.25%(1)     None         None        None
Sales Charge Imposed on Dividend Reinvestments  ...     None         None         None        None
Maximum Contingent Deferred Sales Charge
 (as a percentage of original purchase price or
 redemption proceeds)..............................     None(2)      5.00%(3)     1.00%(4)    None
Redemption Fees....................................     None         None         None        None
Exchange Fee.......................................     None         None         None        None
Annual Fund Operating Expenses (as a percentage of average net assets)
- ----------------------------------------------------------------------
Management Fees ...................................     0.75%        0.75%        0.75%       0.75%
12b-1 Fees (5)(6)..................................     0.25%        1.00%        1.00%       None
Other Expenses ....................................     0.24%        0.24%        0.24%       0.24%
Total Fund Operating Expenses (7)..................     1.24%        1.99%        1.99%       0.99%
</TABLE>
 

 
- ------------
(1)    Reduced for purchases of $25,000 and over (see "Purchase of Fund
       Shares--Initial Sales Charge Alternative--Class A Shares").
(2)    Investments that are not subject to any sales charge at the time of
       purchase are subject to a CDSC of 1.00% that will be imposed on
       redemptions made within one year after purchase, except for certain
       specific circumstances (see "Purchase of Fund Shares--Initial Sales
       Charge Alternative--Class A Shares").
(3)    The CDSC is scaled down to 1.00% during the sixth year, reaching zero
       thereafter.
(4)    Only applicable to redemptions made within one year after purchase (see
       "Purchase of Fund Shares--Level Load Alternative--Class C Shares").
(5)    The 12b-1 fee is accrued daily and payable monthly. The entire 12b-1 fee
       payable by Class A and a portion of the 12b-1 fee payable by each of
       Class B and Class C equal to 0.25% of the average daily net assets of
       the Class are currently each characterized as a service fee within the
       meaning of National Association of Securities Dealers, Inc. ("NASD")
       guidelines and are payments made for personal service and/or maintenance
       of shareholder accounts. The remainder of the 12b-1 fee, if any, is an
       asset-based sales charge, and is a distribution fee paid to the
       Distributor to compensate it for the services provided and the expenses
       borne by the Distributor and others in the distribution of the Fund's
       shares (see "Purchase of Fund Shares--Plan of Distribution").
(6)    Upon conversion of Class B shares to Class A shares, such shares will be
       subject to the lower 12b-1 fee applicable to Class A shares. No sales
       charge is imposed at the time of conversion of Class B shares to Class A
       shares. Class C shares do not have a conversion feature and, therefore,
       are subject to an ongoing 1.00% distribution fee (see "Purchase of Fund
       Shares--Alternative Purchase Arrangements").
(7)    There were no outstanding shares of Class A, Class C or Class D prior to
       the date of this Prospectus. Accordingly, "Total Fund Operating
       Expenses," as shown above with respect to those Classes, are based upon
       the sum of 12b-1 Fees, Management Fees and estimated "Other Expenses."
 

                                4
<PAGE>
- -----------------------------------------------------------------------------

 
<TABLE>
<CAPTION>
 EXAMPLES                                                         1 YEAR   3 YEARS   5 YEARS   10 YEARS
- --------------------------------------------------------------- -------- --------- --------- ----------
<S>                                                             <C>      <C>       <C>       <C>
You would pay the following expenses on a $1,000 investment
assuming (1) a 5% annual return and (2) redemption at the end of each time
period:
  Class A ......................................................   $64       $90      $117       $195
  Class B ......................................................   $70       $92      $127       $232
  Class C.......................................................   $30       $62      $107       $232
  Class D ......................................................   $10       $32      $ 55       $121

You would pay the following expenses on the same $1,000 investment assuming no
redemption at the end of the period:
  Class A ......................................................   $64       $90      $117       $195
  Class B ......................................................   $20       $62      $107       $232
  Class C ......................................................   $20       $62      $107       $232
  Class D ......................................................   $10       $32      $ 55       $121
</TABLE>
 

 
   THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS 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," "Purchase of Fund Shares--Plan of Distribution"
and "Redemption and Repurchases."

   Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.
 

                                5
<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 financial highlights 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. All shares of the Fund held prior to July 28,
1997 have been designated Class B shares.
 

 
<TABLE>
<CAPTION>
                                                                           FOR THE PERIOD
                                           FOR THE YEAR   FOR THE YEAR   SEPTEMBER 29, 1994*
                                              ENDED           ENDED            THROUGH
                                           MAY 31, 1997   MAY 31, 1996      MAY 31, 1995
- ---------------------------------------- -------------- --------------- -------------------
<S>                                      <C>            <C>             <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ....     $15.11         $10.81            $10.00
                                         -------------- --------------- -------------------
Net investment loss......................      (0.13)         (0.10)            (0.01)
Net realized and unrealized gain  .......       0.94           5.60              0.84
                                         -------------- --------------- -------------------
Total from investment operations ........       0.81           5.50              0.83
                                         -------------- --------------- -------------------
Less distributions from net realized
 gain....................................      (1.16)         (1.20)            (0.02)
                                         -------------- --------------- -------------------
Net asset value, end of period...........     $14.76         $15.11            $10.81
                                         ============== =============== ===================
TOTAL INVESTMENT RETURN+.................       6.01%         53.02%             8.26%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses.................................       1.99%          2.05%             2.21%(2)
Net investment loss......................      (1.06)%        (1.05)%           (0.16)%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands      $418,752       $309,272          $115,126
Portfolio turnover rate..................        209%           328%              199%(1)
Average commission rate paid.............    $0.0592         $0.0582               --
</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.
 

                                6
<PAGE>

 
THE FUND AND ITS MANAGEMENT
- -----------------------------------------------------------------------------
 

   Dean Witter Mid-Cap Growth 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 May 25, 1994.

 
   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 Morgan Stanley, Dean Witter,
Discover & Co., a preeminent global financial services firm that maintains
leading market positions in each of its three primary businesses--securities,
asset management and credit services.

   InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to 100 investment companies, thirty of which are
listed on the New York Stock Exchange, with combined assets of approximately
$93.1 billion at June 30, 1997. The Investment Manager also manages portfolios
of pension plans, other institutions and individuals which aggregated
approximately $3.5 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 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
following annual rates to the Fund's net assets: 0.75% of the portion of daily
net assets not exceeding $500 million; and 0.725% of the portion of daily net
assets exceeding $500 million. This fee is higher than the fee paid by most
other investment companies. For the fiscal year ended May 31, 1997, the Fund
accrued total compensation to the Investment Manager amounting to 0.75% of the
Fund's average daily net assets and the Fund's total expenses amounted to 1.99%
of the Fund's average daily net assets.

INVESTMENT OBJECTIVE AND POLICIES
- -----------------------------------------------------------------------------
 

   The investment objective of the Fund is long-term capital growth. The
objective is a fundamental policy of the Fund and may not be changed without a
vote of a majority of the outstanding voting securities of the Fund. There is
no assurance that the objective will be achieved. The following policies may be
changed by the Board of Trustees without shareholder approval.

    
   The Fund seeks to achieve its investment objective by investing, under
normal circumstances, at least 65% of its total assets in a diversified
portfolio of domestic and foreign equity securities of "mid-cap" companies. A
mid-cap company is a company whose market capitalization falls within the range
of $250 million to $5 billion. The Fund may invest up to 35% of its total
assets in (i) U.S. Government Securities, investment grade corporate debt
securities and money market instruments, or (ii) equity securities of companies
with market capitalizations which fall outside of the range of $250 million to
$5 billion at the time of purchase 

                                7
<PAGE>
 
as long as such investments are consistent with the Fund's investment
objective. The Fund may invest up to 35% of its total assets in the equity
securities of non-U.S. companies, including American or other Depository
Receipts, rights, warrants, and the direct purchase of foreign securities.
Equity securities in which the Fund may invest include common stocks and
securities convertible into common stocks. The Fund utilizes an investment
process that places primary emphasis on seeking to identify industries, rather
than individual companies, as prospects for capital appreciation and whereby
the Investment Manager seeks to invest assets of the Fund in industries it
considers to be attractive at the time of purchase and to sell those it
considers overvalued. The Investment Manager will invest principally in those
mid-cap companies that in the opinion of the Investment Manager have
above-average relative growth potential. Mid-cap companies typically have a
better growth potential than their large-cap counterparts because they are
still in the early and more dynamic period of their corporate existences. Often
mid-size companies and the industries in which they are focused are still
evolving as opposed to the more mature industries served by large-cap
companies. Moreover, mid-cap companies are not considered "emerging" stocks,
nor are they as volatile as small-cap firms. This is due to the fact that
mid-cap companies have increased liquidity, attributable to their larger market
capitalization as well as longer and more established track records, and a
stronger market presence and dominance than small-cap firms. Consequently,
because of the better growth inherent in these companies and their industries,
mid-cap companies offer superior return potential to large-cap companies, yet
owing to their relatively larger size and better recognition in the investment
community, they have a reduced risk profile compared to smaller, emerging or
micro-cap companies.
    

   In selecting stocks within the mid-cap universe, the Investment Manager will
use an industry approach that seeks to diversify the assets of the Fund in
approximately 18 to 35 industries. The Fund will hold less than 5% of its net
assets in any one security and will hold less than 10% of its net assets in any
one industry. Companies will be selected based on at least three-year track
records, and purchases will be primarily focused on companies that: (1) have
the potential for above-average relative earnings growth; (2) are focused in
industries that are rapidly expanding or have the potential to see increasing
sales or earnings; (3) historically have had well-defined and recurring
revenues; or (4) are attractive based on an assessment of private market or
franchise values.

   After selection of the Fund's target industries, specific company
investments are selected. In this process, the Investment Manager seeks to
identify companies whose prospects are deemed attractive on the basis of an
evaluation of valuation screens and prospective company fundamentals. From the
total of all companies included in the industry valuation process, the
Investment Manager selects a limited number from each industry as
representative of that industry. Such selections are made on the basis of
various criteria, including size and quality of a company, the visibility of
its earnings and various valuation parameters. Valuation screens may include
dividend discount model values, price-to-book ratios, price-to-cash flow
values, relative and absolute price-to-earnings ratios and ratios of
price-earnings multiples to earnings growth. Price and earnings momentum
ratings derived from external sources are also factored into the stock
selection decision. Those companies which the Investment Manager believes to be
attractive investments are finally selected for inclusion in the Fund. For a
discussion of the risks of mid-cap stocks, see "Risk Considerations" below.

   Asset Allocation. Common stocks, particularly those sought for possible
capital appreciation, have historically experienced a great amount of price
fluctuation. The Investment Manager believes it is desirable to attempt to
reduce the risks of extreme price fluctuations even if such an attempt
results, as it likely will at times, in reducing the probabilities of
obtaining greater capital appreciation. Accordingly, the Investment Manager's
investment process incorporates elements which may reduce, although cer
tainly not eliminate, the volatility of a portfolio. The

                                8
<PAGE>

 
Fund may hold a portion of its portfolio in investment grade fixed-income
securities, including convertible securities, in an effort to moderate extremes
of price fluctuation. The determination of the appropriate asset allocation as
between equity and fixed-income investments will be made by the Investment
Manager in its discretion, based upon its evaluation of economic and market
conditions.

   Money market instruments in which the Fund may invest include securities
issued or guaranteed by the U.S. Government, its agencies and instrumentalities
(Treasury bills, notes and bonds, including zero coupon securities); bank
obligations; Euro-dollar certificates of deposit; obligations of savings
institutions; fully insured certificates of deposit; and commercial paper rated
within the four highest grades by Moody's or S&P or, if not rated, issued by a
company having an outstanding debt issue rated at least AA by S&P or Aa by
Moody's. Such securities may be used to invest uncommitted cash balances.

   There may be periods during which, in the opinion of the Investment Manager,
market conditions warrant reduction of some or all of the Fund's securities
holdings. During such periods, the Fund may adopt a temporary "defensive"
posture in which up to 100% of its total assets is invested in money market
instruments or cash. 
 

PORTFOLIO CHARACTERISTICS

   Fixed-income Securities. Investments in fixed-income securities rated either
BBB by S&P or Baa by Moody's (the lowest credit ratings designated "investment
grade") have speculative characteristics and, therefore, changes in economic
conditions or other circumstances are more likely to weaken their capacity to
make principal and interest payments than would be the case with investments in
securities with higher credit ratings. If a non-convertible fixed-income
security held by the Fund is rated BBB or Baa and is subsequently downgraded by
a rating agency, the Fund will retain such security in its portfolio until the
Investment Manager determines that it is practicable to sell the security
without undue market or tax consequences to the Fund. In the event that such
downgraded securities constitute 5% or more of the Fund's net assets, the
Investment Manager will sell such securities as soon as is practicable, in
sufficient amounts to reduce the total to below 5%.

   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.

   Because of the special nature of the Fund's permitted investments in lower
rated convertible securities, the Investment Manager must take account of
certain special considerations in assessing the risks associated with such
investments. The prices of lower rated securities have been found to be less
sensitive to changes in prevailing interest rates than higher rated
investments, but are likely to

                                9
<PAGE>

be more sensitive to adverse economic changes or individual corporate
developments. During an economic downturn or substantial period of rising
interest rates, highly leveraged issuers may experience financial stress which
would adversely affect their ability to service their principal and interest
payment obligations, to meet their projected business goals or to obtain
additional financing. If the issuer of a lower rated convertible security owned
by the Fund defaults, the Fund may incur additional expenses to seek recovery.
In addition, periods of economic uncertainty and change can be expected to
result in an increased volatility of market prices of lower rated securities
and a corresponding volatility in the net asset value of a share of the Fund.

   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
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. 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.

   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. 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.

   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.

   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 Adviser, 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 cur-

                               10
<PAGE>

rent policy may not exceed 15% 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. The Fund also may purchase and sell (write) call and put options on
debt and equity securities which are listed on Exchanges or are written in
over-the-counter transactions ("OTC Options"). Listed options, which are
currently listed on several different Exchanges, are issued by the Options
Clearing Corporation ("OCC"). Ownership of a listed call option gives the Fund
the right to buy from the OCC the underlying security covered by the option at
the stated exercise price (the price per unit of the underlying security) by
filing an exercise notice prior to the expiration date of the option. The
writer (seller) of the option would then have the obligation to sell to the OCC
the underlying security at that exercise price prior to the expiration date of
the option, regardless of its then current market price. Ownership of a listed
put option would give the Fund the right to sell the underlying security to the
OCC at the stated exercise price. The Fund will not write covered options on
portfolio securities exceeding in the aggregate 25% of the value of its total
assets.

   OTC Options. OTC options are purchased from or sold (written) to dealers or
financial institutions which have entered into direct agreements with the Fund.
With OTC options, such variables as expiration date, exercise price and premium
will be agreed upon between the Fund and the transacting dealer, without the
intermediation of a third party such as the OCC. The Fund will engage in OTC
option transactions only with primary U.S. Government securities dealers
recognized by the Federal Reserve Bank of New York.

   Covered Call Writing. The Fund is permitted to write covered call options on
portfolio securities in order to aid it in achieving its investment objective.
As a writer of a call option, the Fund has the obligation, upon notice of
exercise of the option, to deliver the security underlying the option (certain
listed call options written by the Fund will be exercisable by the purchaser
only on a specific date). See "Options and Futures Transactions--Covered Call
Writing" in the Statement of Additional Information.

   Covered Put Writing. As a writer of covered put options, the Fund incurs an
obligation to buy the security underlying the option from the purchaser of the
put at the option's exercise price at any time during the option period. The
Fund will write put options for two purposes: (1) to receive the premiums paid
by purchasers; and (2) when the Investment Manager wishes to purchase the
security underlying the option at a price lower than its current market price,
in which case it will write the covered put at an exercise price reflecting the
lower purchase price sought. See "Options and Futures Transactions--Covered Put
Writing" in the Statement of Additional Information.

   Purchasing Call and Put Options. The Fund may invest up to 5% of its total
assets in the purchase of put and call options on securities and stock indexes.
The Fund may purchase put options on securities which it holds (or has the
right to acquire) in its portfolio only to protect itself against a decline in
the value of the security. The Fund may also purchase put options 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.

 
   Stock Index Options. The Fund may purchase and write options on stock
indexes only for hedging purposes. Options on stock indexes are similar to
options on stock except that, rather than the right to take or make delivery of
stock at a specified price, an option on a stock index gives the holder the
right to receive, upon exercise of the option, an amount of cash if the closing
level of the stock index upon which the option is based is greater than, in the
case of a call, or less than, in the case of a put, the exercise price of the
option. See "Stock Index Options" and "Risks of Options on Indexes" in the
Statement of Additional Information.
 

                               11
<PAGE>

   Futures Contracts. The Fund may purchase and sell interest rate and stock
index futures contracts ("futures contracts") that are traded on U.S. commodity
exchanges on such underlying securities as U.S. Treasury bonds, notes, and
bills and GNMA Certificates ("interest rate" futures) and such indexes as the
S&P 500 Index and the New York Stock Exchange Composite Index ("stock index"
futures) and the Moody's Investment-Grade Corporate Bond Index ("bond index"
futures). 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 will purchase or sell interest rate futures contracts and bond
index futures contracts for the purpose of hedging its fixed-income portfolio
(or anticipated portfolio) securities against changes in prevailing interest
rates. The Fund will purchase or sell stock index futures contracts for the
purpose of hedging its equity portfolio (or anticipated portfolio) securities
against changes in their prices. See "Options and Futures Transactions--Futures
Contracts" in the Statement of Additional Information.

   The Fund also may purchase and write call and put options on futures
contracts and enter into closing transactions with respect to such options to
terminate an existing position.

 
   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 designed to minimize those risks. These procedures include effecting
repurchase transactions only with large, well-capitalized and well-established
financial institutions whose financial condition will be continually monitored
by the Investment Manager subject to procedures established by the Board of
Trustees of the Fund. In addition, as described above, the value of the
collateral underlying the repurchase agreement will be at least equal to the
repurchase price, including any accrued interest earned on the repurchase
agreement. In the event of a default or bankruptcy by a selling financial
institution, the Fund will seek to liquidate such collateral. However, the
exercising of the Fund's right to liquidate such collateral could involve
certain costs or delays and, to the extent that proceeds from any sale upon a
default of the obligation to repurchase were less than the repurchase price,
the Fund could suffer a loss. It is the current policy of the Fund not to
invest in repurchase agreements that do not mature within seven days if any
such investment, together with any other illiquid assets held by the Fund,
amounts to more than 15% of its net assets.
 

   Foreign Securities. The Fund may invest up to 35% of the value of its total
assets, at the time of purchase, in equity securities, rights and warrants
issued by foreign issuers. Such investments may also be in the form of American
Depository Receipts (ADRs), European Depository Receipts (EDRs) or other
similar securities of foreign issuers. These securities may not necessarily be
denominated in the same currency as the securities into which they may be
converted. ADRs are receipts typically issued by a United States bank or trust
company evidencing ownership of the underlying securities. EDRs are European
receipts evidencing a similar arrangement. Generally, ADRs, in registered form,
are designed for use in the United States securities markets and EDRs, in
bearer form, are designed for use in European securities markets. The Fund's
investments in unlisted foreign securities are subject to the Fund's overall
policy limiting its investment in illiquid securities to 15% or less of its net
assets. For a discussion of the risks of foreign securities, see "Risk
Considerations" below.

                               12
<PAGE>

   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.

   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. Real estate investment trusts are not diversified and are subject to
the risk of financing projects. They are also subject to heavy cash flow
dependency, defaults by borrowers or tenants, self-liquidation, and the
possibility of failing to qualify for tax-free status under the Internal
Revenue Code and failing to maintain exemption from the Investment Company Act
of 1940, as amended.

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, including Dean Witter
Reynolds Inc. ("DWR") and other broker-dealer affiliates of InterCapital, the
views of others regarding economic developments and interest rate trends, and
the Investment Manager's own analysis of factors it deems relevant. No
particular emphasis is given to investments in securities for the purpose of
earning current income. The Fund's portfolio is managed within InterCapital's
Growth Group, which manages 31 funds and fund portfolios with approximately
$13.5 billion in assets as of June 30, 1997. Kirk Balzer, Vice President of
InterCapital, a member of InterCapital's Growth Group, has been a primary
portfolio manager of the Fund since April 1996 and has been the sole primary
portfolio manager of the Fund since December 1996. Prior to joining
InterCapital in April 1996, Mr. Balzer was a portfolio manager at Chancellor
Capital Management (July 1994-March 1996) and GT Capital Management (June
1992-July 1994).
 

   The Fund intends to buy and hold securities for capital appreciation.
Although the Fund does not intend to engage in substantial short-term trading
as a means of achieving its investment objective, it may sell portfolio
securities without regard to the length of time they have been held, in
accordance with the investment policies described earlier. Portfolio changes
will be effected whenever the Fund's

                               13

<PAGE>

Investment Manager believes they will benefit the performance of the portfolio.
As a result the Fund does expect to engage in a substantial number of portfolio
transactions. It is anticipated that, under normal market conditions, the
Fund's portfolio turnover rate will not exceed 350% in any one year. The Fund
will incur brokerage costs commensurate with its portfolio turnover rate; thus
a higher level (over 100%) of portfolio transactions will increase the Fund's
overall brokerage expenses. 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.

 
   Pursuant to an order of the Securities and Exchange Commission the Fund may
effect principal transactions in certain money market instruments with DWR. In
addition, the Fund may incur brokerage commissions on transactions conducted
through DWR and other brokers and dealers that are affiliates of InterCapital.
 

RISK CONSIDERATIONS
- -----------------------------------------------------------------------------

   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
growth of capital through investment primarily in the securities of
medium-sized growth companies. It should be recognized that investing in such
companies involves greater risk than is customarily associated with investing
in more established companies.

   Mid-Cap Stocks. Investing in medium-sized market capitalization companies
may involve greater risk of volatility of the Fund's net asset value than is
customarily associated with investing in larger, more established companies.
Often mid-size companies and the industries in which they are focused are still
evolving and while this may offer better growth potential than larger,
established companies, it also may make them more sensitive to changing market
conditions. Because prices of stocks, including mid-cap stocks, fluctuate from
day to day, the value of an investment in the Fund will vary based upon the
Fund's investment performance.

   Foreign Securities. The Fund may invest up to 35% of its total assets in
equity securities of non-U.S. companies, including American or other Depository
Receipts, rights, warrants and the direct purchase of foreign securities. While
investments in foreign securities are intended to reduce risk by providing
further diversification, such investments involve risks relating to local
foreign political or economic developments, potential nationalization,
withholding taxes on dividend or interest payments, and limitations on the use
or transfer of Fund assets and any effects of foreign social, economic or
political instability. 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. Costs
may be incurred in connection with conversions between various currencies held
by the Fund. Foreign companies may have less public or less reliable
information available about them and may be subject to less governmental
regulation than U.S. companies. Securities of foreign companies may be less
liquid and more volatile than securities of 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

                               14
<PAGE>

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. To the extent the Fund purchases Eurodollar certificates of
deposit issued by foreign branches of domestic United States banks,
consideration will be given to their domestic marketability, the lower reserve
requirements normally mandated for overseas banking operations, the possible
impact of interruptions in the flow of international currency transactions and
future international political and economic developments which might adversely
affect the payment of principal or interest.

   Options and Futures Transactions. 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. Also, exchanges may limit
the amount by which the price of many futures contracts may move on any day. If
the price moves equal the daily limit on successive days, then it may prove
impossible to liquidate a futures position until the daily limit moves have
ceased.

   The extent to which the Fund may enter into transactions involving options
and futures contracts may be limited by the Internal Revenue Code's
requirements for qualification as a regulated investment company and the
Fund's intention to qualify as such. See "Dividends, Distributions and
Taxes."

   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 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, causing
bond prices to rise, the Fund would incur a loss on the sale. Another risk
which may arise in employing futures contracts to protect against the price
volatility of portfolio securities is that the prices of securities and indexes
subject to futures contracts (and thereby the futures contract prices) may
correlate imperfectly with the behavior of the cash prices of the Fund's
portfolio securities. See the Statement of Additional Information for a further
discussion of risks.

   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.

   For additional risk disclosure, please refer to the "Portfolio
Characteristics" section of the Prospectus and to the "Investment Practices and
Policies" section of 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

                               15
<PAGE>

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. Purchase more than 10% of all outstanding voting securities or any
class of securities of any one issuer.

   3. 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 or its agencies or
instrumentalities.

   4. 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 of
the United States Government, its agencies or instrumentalities.

   See the Statement of Additional Information for additional investment
restrictions.

 
   Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objective and policies as the Fund.

PURCHASE OF FUND SHARES
- -----------------------------------------------------------------------------

GENERAL

   The Fund offers each class of 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 Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge that declines to zero for larger
purchases; however, Class A shares sold without an initial sales charge are
subject to a contingent deferred sales charge ("CDSC") of 1.0% if redeemed
within one year of purchase, except for certain specific circumstances. Class B
shares are sold without an initial sales charge but are subject to a CDSC
(scaled down from 5.0% to 1.0%) payable upon most redemptions within six years
after purchase. (Class B shares purchased by certain qualified
employer-sponsored benefit plans are subject to a CDSC scaled down from 2.0% to
1.0% if redeemed within three years after purchase.) Class C shares are sold
without an initial sales charge but are subject to a CDSC of 1.0% on most
redemptions made within one year after purchase. Class D shares are sold
without an initial sales charge or CDSC and are available only to investors
meeting an initial investment minimum of $5 million, and to certain other
limited categories of investors. At the discretion of the Board of Trustees of
the Fund, Class A shares may be sold to categories of investors in addition to
those set forth in this prospectus at net asset value without a front-end sales
charge, and Class D shares may be sold to certain other categories of
investors, in each case as may be described in the then current prospectus of
the Fund. See "Alternative Purchase Arrange ments--Selecting a Particular
Class" for a discussion of factors to consider in selecting which Class of
shares to purchase.

   The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are 
 

                               16
<PAGE>

 
only available to persons investing $5 million or more and to certain other
limited categories of investors. For the purpose of meeting the minimum $5
million initial investment for Class D shares, and subject to the $1,000
minimum initial investment for each Class of the Fund, an investor's existing
holdings of Class A shares of the Fund and other Dean Witter Funds that are
multiple class funds ("Dean Witter Multi-Class Funds") and shares of Dean
Witter Funds sold with a front-end sales charge ("FSC Funds") and concurrent
investments in Class D shares of the Fund and other Dean Witter Multi-Class
Funds will be aggregated. Subsequent purchases of $100 or more may be made by
sending a check, payable to Dean Witter Mid-Cap Growth 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. When purchasing shares of the Fund, investors must specify
whether the purchase is for Class A, Class B, Class C or Class D shares. If no
Class is specified, the Transfer Agent will not process the transaction until
the proper Class is identified. The minimum initial purchase in the case of
investments through EasyInvestSM, 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.

   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. Sales personnel of a Selected Broker-Dealer are compensated for
selling shares of the Fund by the Distributor or any of its affiliates 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.

ALTERNATIVE PURCHASE ARRANGEMENTS

   The Fund offers several Classes of shares to investors designed to provide
them with the flexibility of selecting an investment best suited to their
needs. The general public is offered three Classes of shares: Class A shares,
Class B shares and Class C shares, which differ principally in terms of sales
charges and rate of expenses to which they are subject. A fourth Class of
shares, Class D shares, is offered only to limited categories of investors (see
"No Load Alternative--Class D Shares" below).

   Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder service
fees, Class B and Class C shares bear the expenses of the ongoing distribution
fees and Class A, Class B and Class C shares which are redeemed subject to a
CDSC bear the expense of the additional incremental distribution costs
resulting from the CDSC applicable to shares of those Classes. The ongoing
distribution fees that are imposed on Class A, Class B and Class C shares will
be imposed directly against those Classes and not against all assets of the
Fund and, accordingly, such charges against 
 

                               17

<PAGE>

 
one Class will not affect the net asset value of any other Class or have any
impact on investors choosing another sales charge option. See "Plan of
Distribution" and "Redemptions and Repurchases."

   Set forth below is a summary of the differences between the Classes and the
factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.

   Class A Shares. Class A shares are sold at net asset value plus an initial
sales charge of up to 5.25%. The initial sales charge is reduced for certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."

   Class B Shares. Class B shares are offered at net asset value with no
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%)
if redeemed within six years of purchase. (Class B shares purchased by certain
qualified employer-sponsored benefit plans are subject to a CDSC scaled down
from 2.0% to 1.0% if redeemed within three years after purchase.) This CDSC may
be waived for certain redemptions. Class B shares are also subject to an annual
12b-1 fee of 1.0% of the lesser of: (a) the average daily aggregate gross sales
of the Fund's Class B 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 Class B shares redeemed since the
Fund's inception upon which a CDSC has been imposed or waived, or (b) the
average daily net assets of Class B. The Class B shares' distribution fee will
cause that Class to have higher expenses and pay lower dividends than Class A
or Class D shares.

   After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative--Class B Shares."

   Class C Shares. Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class
to have higher expenses and pay lower dividends than Class A or Class D shares.
See "Level Load Alternative--Class C Shares."

   Class D Shares. Class D shares are available only to limited categories of
investors (see "No Load Alternative--Class D Shares" below). Class D shares
are sold at net asset value with no initial sales charge or CDSC. They are
not subject to any 12b-1 fees. See "No Load Alternative--Class D Shares."

   Selecting a Particular Class. In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:

   The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire pur- 
 

                               18
<PAGE>

 
chase price is immediately invested in the Fund. Any investment return on these
additional investment amounts may partially or wholly offset the higher annual
expenses of these Classes. Because the Fund's future return cannot be
predicted, however, there can be no assurance that this would be the case.

   Finally, investors should consider the effect of the CDSC period and any
conversion rights of the Classes in the context of their own investment time
frame. For example, although Class C shares are subject to a significantly
lower CDSC upon redemptions, they do not, unlike Class B shares, convert into
Class A shares after approximately ten years, and, therefore, are subject to an
ongoing 12b-1 fee of 1.0% (rather than the 0.25% fee applicable to Class A
shares) for an indefinite period of time. Thus, Class B shares may be more
attractive than Class C shares to investors with longer term investment
outlooks. Other investors, however, may elect to purchase Class C shares if,
for example, they determine that they do not wish to be subject to a front-end
sales charge and they are uncertain as to the length of time they intend to
hold their shares.

   For the purpose of meeting the $5 million minimum investment amount for
Class D shares, holdings of Class A shares in all Dean Witter Multi-Class
Funds, shares of FSC Funds and shares of Dean Witter Funds for which such
shares have been exchanged will be included together with the current
investment amount.

   Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that the purpose of a CDSC is the same as
that of the initial sales charge in that the sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.

   Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:
 

 
<TABLE>
<CAPTION>
                                                      CONVERSION
   CLASS         SALES CHARGE          12B-1 FEE         FEATURE
- -------------------------------------------------------------------------------
<S>       <C>                       <C>           <C>
     A        maximum 5.25%              0.25%          No
              initial sales charge
              reduced for
              purchases of
              $25,000 and over;
              shares sold without
              an initial sales
              charge generally
              subject to a 1.0%
              CDSC during first
              year.                                             
- -------------------------------------------------------------------------------
     B        Maximum 5.0%               1.0%           B shares convert
              DCSC during the first                     to A shares
              year decreasing                           automatically
              to 0 after six years                      after
                                                        approximately
                                                        ten years
- -------------------------------------------------------------------------------
     C        1.0% CDSC during            1.0%           No
              first year                                       
- -------------------------------------------------------------------------------
     D         None                      None            No
- -------------------------------------------------------------------------------
</TABLE>
 

 
   See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.

INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES

   Class A shares are sold at net asset value plus an initial sales charge. In
some cases, reduced sales charges may be available, as described below.
Investments of $1 million or more (and investments by certain other limited
categories of investors) are not subject to any sales charges at the time of
purchase but are subject to a CDSC of 1.0% on redemptions made within one year
after purchase (calculated from the last day of the month in which the shares
were purchased), except for certain specific circumstances. The CDSC will be
assessed on an amount equal to the lesser of the current market value or the
cost of the shares being redeemed. The CDSC will not be imposed (i) in the 
 

                               19

<PAGE>

 
circumstances set forth below in the section "Contingent Deferred Sales Charge
Alternative--Class B Shares--CDSC Waivers," except that the references to six
years in the first paragraph of that section shall mean one year in the case of
Class A shares, and (ii) in the circumstances identified in the section
"Additional Net Asset Value Purchase Options" below. Class A shares are also
subject to an annual 12b-1 fee of up to 0.25% of the average daily net assets
of the Class.

   The offering price of Class A shares will be the net asset value per share
next determined following receipt of an order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a percentage of the offering
price) on a single transaction as shown in the following table:
 

 
<TABLE>
<CAPTION>
                               SALES CHARGE
                     -------------------------------
                       PERCENTAGE OF    APPROXIMATE
  AMOUNT OF SINGLE    PUBLIC OFFERING  PERCENTAGE OF
     TRANSACTION           PRICE      AMOUNT INVESTED
- -------------------- --------------- ---------------
<S>                  <C>             <C>
Less than $25,000  ..      5.25%           5.54%
$25,000 but less
  than $50,000 ......      4.75%           4.99%
$50,000 but less
  than $100,000 .....      4.00%           4.17%
$100,000 but less
  than $250,000 .....      3.00%           3.09%
$250,000 but less
  than $1 million  ..      2.00%           2.04%
$1 million and over         0                 0
</TABLE>
 

 
   Upon notice to all Selected Broker-Dealers, the Distributor may reallow up
to the full applicable sales charge as shown in the above schedule during
periods specified in such notice. During periods when 90% or more of the sales
charge is reallowed, such Selected Broker-Dealers may be deemed to be
underwriters as that term is defined in the Securities Act of 1933.

   The above schedule of sales charges is applicable to purchases in a single
transaction by, among others: (a) an individual; (b) an individual, his or her
spouse and their children under the age of 21 purchasing shares for his, her or
their own accounts; (c) a trustee or other fiduciary purchasing shares for a
single trust estate or a single fiduciary account; (d) a pension,
profit-sharing or other employee benefit plan qualified or non-qualified under
Section 401 of the Internal Revenue Code; (e) tax-exempt organizations
enumerated in Section 501(c)(3) or (13) of the Internal Revenue Code; (f)
employee benefit plans qualified under Section 401 of the Internal Revenue Code
of a single employer or of employers who are "affiliated persons" of each other
within the meaning of Section 2(a)(3)(c) of the Act; and for investments in
Individual Retirement Accounts of employees of a single employer through
Systematic Payroll Deduction plans; or (g) any other organized group of
persons, whether incorporated or not, provided the organization has been in
existence for at least six months and has some purpose other than the purchase
of redeemable securities of a registered investment company at a discount.

   Combined Purchase Privilege. Investors may have the benefit of reduced sales
charges in accordance with the above schedule by combining purchases of Class A
shares of the Fund in single transactions with the purchase of Class A shares
of other Dean Witter Multi-Class Funds and shares of FSC Funds. The sales
charge payable on the purchase of the Class A shares of the Fund, the Class A
shares of the other Dean Witter Multi-Class Funds and the shares of the FSC
Funds will be at their respective rates applicable to the total amount of the
combined concurrent purchases of such shares.

   Right of Accumulation. The above persons and entities may benefit from a
reduction of the sales charges in accordance with the above schedule if the
cumulative net asset value of Class A shares purchased in a single transaction,
together with shares of the Fund and other Dean Witter Funds previously
purchased at a price including a front-end sales charge (including shares of
the Fund and other Dean Witter Funds acquired in exchange for those shares, and
including in each case shares acquired through reinvestment of dividends and
distributions), which are held at the time of such transaction, amounts to
$25,000 or more. If such investor has a cumulative net asset value of shares of
FSC Funds and Class A and Class D shares equal to at least $5 million, such
investor is eligible to purchase Class D shares subject to the $1,000 minimum
initial investment requirement of that Class of the Fund. See "No Load
Alternative--Class D Shares" below. 
 

                               20
<PAGE>

 
   The Distributor must be notified by DWR or a Selected Broker-Dealer or the
shareholder at the time a purchase order is placed that the purchase qualifies
for the reduced charge under the Right of Accumulation. Similar notification
must be made in writing by the dealer or shareholder when such an order is
placed by mail. The reduced sales charge will not be granted if: (a) such
notification is not furnished at the time of the order; or (b) a review of the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm
the investor's represented holdings.

   Letter of Intent. The foregoing schedule of reduced sales charges will also
be available to investors who enter into a written Letter of Intent providing
for the purchase, within a thirteen-month period, of Class A shares of the Fund
from DWR or other Selected Broker-Dealers. The cost of Class A shares of the
Fund or shares of other Dean Witter Funds which were previously purchased at a
price including a front-end sales charge during the 90-day period prior to the
date of receipt by the Distributor of the Letter of Intent, or of Class A
shares of the Fund or shares of other Dean Witter Funds acquired in exchange
for shares of such funds purchased during such period at a price including a
front-end sales charge, which are still owned by the shareholder, may also be
included in determining the applicable reduction.

   Additional Net Asset Value Purchase Options. In addition to investments of
$1 million or more, Class A shares also may be purchased at net asset value by
the following:

   (1) trusts for which Dean Witter Trust Company ("DWTC") or Dean Witter Trust
FSB ("DWTFSB") (each of which is an affiliate of the Investment Manager)
provides discretionary trustee services;

   (2) persons participating in a fee-based program approved by the
Distributor, pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory or administrative services (such
investments are subject to all of the terms and conditions of such programs,
which may include termination fees and restrictions on transferability of Fund
shares);

   (3) retirement plans qualified under Section 401(k) of the Internal Revenue
Code ("401(k) plans") and other employer-sponsored plans qualified under
Section 401(a) of the Internal Revenue Code with at least 200 eligible
employees and for which DWTC or DWTFSB serves as Trustee or the 401(k) Support
Services Group of DWR serves as recordkeeper;

   (4) 401(k) plans and other employer-sponsored plans qualified under Section
401(a) of the Internal Revenue Code for which DWTC or DWTFSB serves as Trustee
or the 401(k) Support Services Group of DWR serves as recordkeeper whose Class
B shares have converted to Class A shares, regardless of the plan's asset size
or number of eligible employees;

   (5) investors who are clients of a Dean Witter account executive who joined
Dean Witter from another investment firm within six months prior to the date of
purchase of Fund shares by such investors, if the shares are being purchased
with the proceeds from a redemption of shares of an open-end proprietary mutual
fund of the account executive's previous firm which imposed either a front-end
or deferred sales charge, provided such purchase was made within sixty days
after the redemption and the proceeds of the redemption had been maintained in
the interim in cash or a money market fund; and

   (6) other categories of investors, at the discretion of the Board, as
disclosed in the then current prospectus of the Fund.

   No CDSC will be imposed on redemptions of shares purchased pursuant to
paragraphs (1), (2) or (5), above.

   For further information concerning purchases of the Fund's shares, contact
DWR or another Se-lected Broker-Dealer or consult the Statement of Additional
Information.

CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES

   Class B shares are sold at net asset value next determined without an
initial sales charge so that 
 

                               21
<PAGE>

 
the full amount of an investor's purchase payment may be immediately invested
in the Fund. A CDSC, however, will be imposed on most Class B shares redeemed
within six years after purchase. The CDSC will be imposed on any redemption of
shares if after such redemption the aggregate current value of a Class B
account with the Fund falls below the aggregate amount of the investor's
purchase payments for Class B shares made during the six years (or, in the case
of shares held by certain employer-sponsored benefit plans, three years)
preceding the redemption. In addition, Class B shares are subject to an annual
12b-1 fee of 1.0% of the lesser of: (a) the average daily aggregate gross sales
of the Fund's Class B 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 Class B shares redeemed since the
Fund's inception upon which a CDSC has been imposed or waived, or (b) the
average daily net assets of Class B.

   Except as noted below, Class B 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 CDSC upon
redemption. Shares redeemed earlier than six years after purchase may, however,
be subject to a 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
percentage will depend upon how long the shares have been held, as set forth in
the following table:
 

 
<TABLE>
<CAPTION>
         YEAR SINCE
          PURCHASE            CDSC AS A PERCENTAGE
        PAYMENT MADE           OF 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>
 

 
   In the case of Class B shares of the Fund held by 401 (k) plans or other
employer-sponsored plans qualified under Section 401(a) of the Internal Revenue
Code for which DWTC or DWTFSB serves as Trustee or the 401(k) Support Services
Group of DWR serves as recordkeeper and whose accounts are opened on or after
July 28, 1997, shares held for three years or more after purchase (calculated
as described in the paragraph above) will not be subject to any CDSC upon
redemption. However, shares redeemed earlier than three years after purchase
may be subject to a CDSC (calculated as described in the paragraph above), the
percentage of which will depend on how long the shares have been held, as set
forth in the following table: 
 

 
<TABLE>
<CAPTION>
         YEAR SINCE
          PURCHASE            CDSC AS A PERCENTAGE
        PAYMENT MADE           OF AMOUNT REDEEMED
- -------------------------- ------------------------
<S>                        <C>
First .....................           2.0%
Second ....................           2.0%
Third .....................           1.0%
Fourth and thereafter  ....           None
</TABLE>
 

 
   CDSC Waivers. A CDSC will not be imposed on: (i) any amount which represents
an increase in value of shares purchased within the six years (or, in the case
of shares held by certain employer-sponsored benefit plans, three years)
preceding the redemption; (ii) the current net asset value of shares purchased
more than six years (or, in the case of shares held by certain
employer-sponsored benefit plans, three 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 FSC
Funds 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, the CDSC, if otherwise applicable, will be waived in the case
of:
 

                               22
<PAGE>

 
   (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
401(k) plan or other employer-sponsored plan qualified under Section 401(a) 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 DWTC or DWTFSB serves as
Trustee or the 401(k) Support Services Group of DWR serves as recordkeeper
("Eligible Plan"), provided that either: (A) the plan continues to be an
Eligible 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.

   Conversion to Class A Shares. All shares of the Fund held prior to July 28,
1997 have been designated Class B shares. Shares held before May 1, 1997 will
convert to Class A shares in May, 2007. In all other instances Class B shares
will convert automatically to Class A shares, based on the relative net asset
values of the shares of the two Classes on the conversion date, which will be
approximately ten (10) years after the date of the original purchase. The ten
year period is calculated from the last day of the month in which the shares
were purchased or, in the case of Class B shares acquired through an exchange
or a series of exchanges, from the last day of the month in which the original
Class B shares were purchased, provided that shares originally purchased before
May 1, 1997 will convert to Class A shares in May, 2007. The conversion of
shares purchased on or after May 1, 1997 will take place in the month following
the tenth anniversary of the purchase. There will also be converted at that
time such proportion of Class B shares acquired through automatic reinvestment
of dividends and distributions owned by the shareholder as the total number of
his or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a 401(k) plan or other employer-sponsored plan
qualified under Section 401(a) of the Internal Revenue Code and for which DWTC
or DWTFSB serves as Trustee or the 401(k) Support Services Group of DWR serves
as recordkeeper, the plan is treated as a single investor and all Class B
shares will convert to Class A shares on the conversion date of the first
shares of a Dean Witter Multi-Class Fund purchased by that plan. In the case of
Class B shares previously exchanged for shares of an "Exchange Fund" (see
"Shareholder Services--Exchange Privilege"), the period of time the shares were
held in the Exchange Fund (calculated from the last day of the month in which
the Exchange Fund shares were acquired) is excluded
 
                               23
<PAGE>
 
from the holding period for conversion. If those shares are subsequently
re-exchanged for Class B shares of a Dean Witter Multi-Class Fund, the holding
period resumes on the last day of the month in which Class B shares are
reacquired.

   If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that
are not received by the Transfer Agent at least one week prior to any
conversion date will be converted into Class A shares on the next scheduled
conversion date after such certificates are received.

   Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion
will have a basis equal to the shareholder's basis in the converted Class B
shares immediately prior to the conversion, and (iii) Class A shares received
on conversion will have a holding period that includes the holding period of
the converted Class B shares. The conversion feature may be suspended if the
ruling or opinion is no longer available. In such event, Class B shares would
continue to be subject to Class B 12b-1 fees.

   Class B shares purchased before July 28, 1997 by trusts for which DWTC or
DWTFSB provides discretionary trustee services will convert to Class A shares
on or about August 29, 1997. The CDSC will not be applicable to such shares.

LEVEL LOAD ALTERNATIVE--CLASS C SHARES

   Class C shares are sold at net asset value next determined without an
initial sales charge but are subject to a CDSC of 1.0% on most redemptions made
within one year after purchase (calculated from the last day of the month in
which the shares were purchased). The CDSC will be assessed on an amount equal
to the lesser of the current market value or the cost of the shares being
redeemed. The CDSC will not be imposed in the circumstances set forth above in
the section "Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC
Waivers," except that the references to six years in the first paragraph of
that section shall mean one year in the case of Class C shares. Class C shares
are subject to an annual 12b-1 fee of up to 1.0% of the average daily net
assets of the Class. Unlike Class B shares, Class C shares have no conversion
feature and, accordingly, an investor that purchases Class C shares will be
subject to 12b-1 fees applicable to Class C shares for an indefinite period
subject to annual approval by the Fund's Board of Trustees and regulatory
limitations.

NO LOAD ALTERNATIVE--CLASS D SHARES

   Class D shares are offered without any sales charge on purchase or
redemption and without any 12b-1 fee. Class D shares are offered only to
investors meeting an initial investment minimum of $5 million and the following
categories of investors: (i) investors participating in the InterCapital mutual
fund asset allocation program pursuant to which such persons pay an asset based
fee; (ii) persons participating in a fee-based program approved by the
Distributor, pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory or administrative services (subject to all
of the terms and conditions of such programs, which may include termination
fees and restrictions on transferability of Fund shares); (iii) 401(k) plans
established by DWR and SPS Transaction Services, Inc. (an affiliate of DWR) for
their employees; (iv) certain Unit Investment Trusts sponsored by DWR; (v)
certain other open-end investment companies whose shares are distributed by the
Distributor; and (vi) other categories of investors, at the discretion of the
Board, as disclosed in the then current prospectus of the Fund. Investors who
require a $5 million minimum initial investment to qualify to purchase Class D
shares may satisfy that requirement by investing that amount in a single
transaction in Class D shares of the Fund and other Dean Witter Multi-Class
Funds, subject to the $1,000 minimum initial investment required for that Class
of the Fund. In addition, for the purpose of meeting the $5 million minimum
investment amount, holdings of
 

                               24
<PAGE>

 
Class A shares in all Dean Witter Multi-Class Funds, shares of FSC Funds and
shares of Dean Witter Funds for which such shares have been exchanged will be
included together with the current investment amount. If a shareholder redeems
Class A shares and purchases Class D shares, such redemption may be a taxable
event.

PLAN OF DISTRIBUTION

   The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act with respect to the distribution of Class A, Class B and Class C shares of
the Fund. In the case of Class A and Class C shares, the Plan provides that the
Fund will reimburse the Distributor and others for the expenses of certain
activities and services incurred by them specifically on behalf of those
shares. Reimbursements for these expenses will be made in monthly payments by
the Fund to the Distributor, which will in no event exceed amounts equal to
payments at the annual rates of 0.25% and 1.0% of the average daily net assets
of Class A and Class C, respectively. In the case of Class B shares, the Plan
provides that the Fund will pay the Distributor a fee, which is accrued daily
and paid monthly, at the annual rate of 1.0% of the lesser of: (a) the average
daily aggregate gross sales of the Fund's Class B 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
Class B shares redeemed since the Fund's inception upon which a CDSC has been
imposed or waived, or (b) the average daily net assets of Class B. The fee is
treated by the Fund as an expense in the year it is accrued. In the case of
Class A shares, the entire amount of the fee currently represents a service fee
within the meaning of the NASD guidelines. In the case of Class B and Class C
shares, a portion of the fee payable pursuant to the Plan, equal to 0.25% of
the average daily net assets of each of these Classes, is currently
characterized as a service fee. A service fee is a payment made for personal
service and/or the maintenance of shareholder accounts.

   Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of DWR's 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 in the
case of Class B shares 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 May 31, 1997, the Fund accrued payments under the
Plan amounting to $3,526,078, which amount is equal to 1.0% of the Fund's
average daily net assets for the fiscal year. The payments accrued under the
Plan were calculated pursuant to clause (b) of the compensation formula under
the Plan. All shares held prior to July 28, 1997 have been designated Class B
shares.

   In the case of Class B shares, at any given time, the expenses in
distributing Class B 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
CDSCs paid by investors upon the redemption of Class B shares. For example, if
$1 million in expenses in distributing Class B shares of 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 such excess amounts, including the carrying charge described above,
totalled $12,182,108 at May 31, 1997, which was equal to 2.91% of the net
assets of the Fund on such date. Because there is no requirement under the Plan
that the Distributor be reimbursed for all distribution expenses or any
require-
 

                               25
<PAGE>

 
ment that the Plan be continued from year to year, such excess amount 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 CDSCs 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 CDSCs, may or may
not be recovered through future distribution fees or CDSCs.

   In the case of Class A and Class C shares, expenses incurred pursuant to the
Plan in any calendar year in excess of 0.25% or 1.0% of the average daily net
assets of Class A or Class C, respectively, will not be reimbursed by the Fund
through payments in any subsequent year, except that expenses representing a
gross sales commission credited to account executives at the time of sale may
be reimbursed in the subsequent calendar year. No interest or other financing
charges will be incurred on any Class A or Class C distribution expenses
incurred by the Distributor under the Plan or on any unreimbursed expenses due
to the Distributor pursuant to the Plan.
 

DETERMINATION OF NET ASSET VALUE

 
   The net asset value per share is determined once daily at 4:00 p.m., New
York time (or, on days when the New York Stock Exchange closes prior to 4:00
p.m., at such earlier time), by taking the net assets of the Fund, dividing by
the number of shares outstanding and adjusting to the nearest cent. The assets
belonging to the Class A, Class B, Class C and Class D shares will be invested
together in a single portfolio. The net asset value of each Class, however,
will be determined separately by subtracting each Class's accrued expenses and
liabilities. 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); (2) an option is valued at the mean between the latest bid and asked
prices; (3) a futures contract is valued at the latest sales price on the
commodities exchange on which it trades unless the Board determines that such
price does not reflect its market value, in which case it will be valued at its
fair value as determined by the Board of Trustees; (4) all other portfolio
securities for which over-the-counter market quotations are readily available
are valued at the latest bid price; (5) when market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that sale or 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 Fund's Trustees (valuation of debt securities for which market
quotations are not readily available may be based upon current market prices of
securities which are comparable in coupon, rating and maturity or an
appropriate matrix utilizing similar factors); (6) the value of short-term debt
securities which mature at a date less than sixty days subsequent to valuation
date will be determined on an amortized cost or amortized value basis; and (7)
the value of other assets will be determined in good faith at fair value under
procedures established by and under the general supervision of the Fund's
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. Interest income is accrued daily
except when collection is uncertain.
 

                               26
<PAGE>

   Certain securities in the Fund's portfolio 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 applicable Class of the Fund (or, if specified by the
shareholder, in shares of any other open-end Dean Witter Fund), unless the
shareholder requests that they be paid in cash. Shares so acquired are acquired
at net asset value and are not subject to the imposition of a front-end sales
charge or a CDSC (see "Redemptions and Repurchases").

   Investment of Dividends or Distributions Received in Cash. Any shareholder
who receives a cash payment representing a dividend or capital gains
distribution may invest such dividend or distribution in shares of the
applicable Class at the net asset value 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 acquired at
net asset value and are not subject to the imposition of a front-end sales
charge or a CDSC (see "Redemptions and Repurchases").

   EasyInvest (Service Mark). 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 or following
redemption of shares of a Dean Witter money market fund, 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").

   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 amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable CDSC
will be imposed on shares redeemed under the Withdrawal Plan (see "Purchase of
Fund Shares"). 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 CDSC) 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. Each withdrawal constitutes a redemption of shares and
any gain or loss realized must be recognized for federal income tax purposes.
 

   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
Broker-Dealer account executive or the Transfer Agent.

                               27
<PAGE>

 
EXCHANGE PRIVILEGE

   Shares of each Class may be exchanged for shares of the same Class of any
other Dean Witter Multi-Class Fund without the imposition of any exchange fee.
Shares may also be exchanged for shares of the following funds: Dean Witter
Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal Trust, Dean
Witter Short-Term Bond Fund, Dean Witter Intermediate Term U.S. Treasury Trust
and five Dean Witter funds which are money market funds (the "Exchange Funds").
Class A shares may also be exchanged for shares of Dean Witter Multi-State
Municipal Series Trust and Dean Witter Hawaii Municipal Trust, which are Dean
Witter Funds sold with a front-end sales charge ("FSC Funds"). Class B shares
may also be exchanged for shares of Dean Witter Global Short-Term Income Fund
Inc., Dean Witter High Income Securities and Dean Witter National Municipal
Trust, which are Dean Witter Funds offered with a CDSC ("CDSC 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 Dean Witter Multi-Class Fund, any FSC Fund, any CDSC
Fund or 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 their net asset value determined the following day.
Subsequent exchanges between any of the money market funds and any of the Dean
Witter Multi-Class Funds, FSC Funds or CDSC Funds or any Exchange Fund that is
not a money market fund can be effected on the same basis.

   No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an 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 re-exchanged for shares of a Dean Witter
Multi-Class Fund or 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 Dean Witter Multi-Class Fund or shares of a CDSC Fund are
reacquired. Thus, the CDSC is based upon the time (calculated as described
above) the shareholder was invested in shares of a Dean Witter Multi-Class Fund
or in shares of a CDSC Fund (see "Purchase of Fund Shares"). In the case of
exchanges of Class A shares which are subject to a CDSC, the holding period
also includes the time (calculated as described above) the shareholder was
invested in shares of a FSC Fund. However, in the case of shares exchanged into
an Exchange Fund on or after April 23, 1990, 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, if any, 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.) Class B shares of the Fund acquired in exchange
for Class B shares of another Dean Witter Multi-Class Fund or shares of a CDSC
Fund having a different CDSC schedule than that of this Fund will be subject to
the higher CDSC schedule, even if such shares are subsequently re-exchanged for
shares of the fund with the lower CDSC schedule.

   Additional Information Regarding Exchanges. 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 
 

                               28
<PAGE>

does not have any specific definition of what 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 to 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
of each Class of shares 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 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 case with the Dean
Witter Funds in the past.

   For further information regarding the Exchange Privilege, shareholders
should contact their account executive or the Transfer Agent.

                               29
<PAGE>
REDEMPTIONS AND REPURCHASES
- -----------------------------------------------------------------------------

 
   Redemption. Shares of each Class of the Fund can be redeemed for cash at any
time at the net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see
"Purchase of Fund Shares"). 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, the shares may be redeemed by
surrendering the certificates with a written request for redemption, along with
any additional documentation required by the Transfer Agent.
 

   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 request of the shareholder. The repurchase price is the net
asset value per share next determined (see "Purchase of Fund Shares") after
such purchase 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 upon repurchase by the Fund,
the Distributor or DWR. The offer by DWR and other Selected Broker-Dealers to
repurchase shares may be suspended without notice by them 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
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 previously exercised this reinstatement
privilege may, within 35 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 in the same Class from which such shares were redeemed or
repurchased, 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, upon sixty days'
notice, to redeem, at their 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 Board of Trustees, or, in the case of an
account opened through EasyInvest (Service Mark), 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 the shareholder sixty days to make an additional investment in
an amount 
 

                               30
<PAGE>

which will increase the value of the 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 declares dividends separately for each
Class of shares and intends to distribute substantially all of its net
investment income and net realized short-term and long-term capital gains, if
any, at least once each year. The Fund may, however, determine either to
distribute or to retain all or part of any net long-term capital gains in any
year for reinvestment.

   All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's
account without issuance of a share certificate unless the shareholder requests
in writing that all dividends be paid in cash. Shares acquired by dividend and
distribution reinvestments will not be subject to any front-end sales charge or
CDSC. Class B shares acquired through dividend and distribution reinvestments
will become eligible for conversion to Class A shares on a pro rata basis.
Distributions paid on Class A and Class D shares will be higher than for Class
B and Class C shares because distribution fees paid by Class B and Class C
shares are higher. (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 remain
qualified 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. Shareholders who are required to pay taxes on their income
will normally have to pay federal income taxes, and any state income taxes, on
the dividends and distributions they receive from the Fund. Such dividends and
distributions, to the extent that they are derived from net investment income
or 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. Any dividends declared in the
last quarter of any calendar year which are paid in the following year prior to
February 1 will be deemed, for tax purposes, to have been received by the
shareholder in the prior year.

   One of the requirements for the Fund to remain qualified as a regulated
investment company is that less than 30% of the Fund's gross income be derived
from gains from the sale or other disposition of securities held for less than
three months. Accordingly, the Fund may be restricted in the writing of options
on securities held for less than three months, in the writing of options which
expire in less than three months, and in effecting closing transactions with
respect to call or put options which have been written or purchased less than
three months prior to such transactions. The Fund may also be restricted in its
ability to engage in transactions involving futures contracts. 
 

   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 would, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments would 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, including information as to the portion taxable as ordinary income,
the portion taxable as long-term capital gains, and the amount of dividends
eligible for the
 

                               31
<PAGE>

Federal dividends received deduction available to corporations. 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.

   Shareholders should consult their tax advisers as to the applicability of
the foregoing to their current situation.

PERFORMANCE INFORMATION
- -----------------------------------------------------------------------------

 
   From time to time the Fund may quote its "total return" in advertisements
and sales literature. These figures are computed separately for Class A, Class
B, Class C and Class D shares. 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 a Class of 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 applicable
Class and all sales charges which would be 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 for
each Class over different periods of time by means of aggregate, average,
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge which, if reflected, would
reduce the performance quoted. The Fund may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in each Class of
shares of the Fund. 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 Mid-Cap Index, NASDAQ Composite, Russell Mid
Cap Index, S&P 500 Index and the Wilshire Mid Cap Index.

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 except
that each Class will have exclusive voting privileges with respect to matters
relating to distribution expenses borne solely by such Class or any other
matter in which the interests of one Class differ from the interests of any
other Class. In addition, Class B shareholders will have the right to vote on
any proposed material increase in Class A's expenses, if such proposal is
submitted separately to Class A shareholders. Also, as discussed herein, Class
A, Class B and Class C bear the expenses related to the distribution of their
respective shares. 
 

   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
limited circumstances, be held personally liable as partners for the
obligations of the Fund. However, the Declaration of

                               32
<PAGE>

Trust contains an express disclaimer of shareholder liability for acts or
obligations of the Fund, requires that notice of such Fund obligations include
such disclaimer, and provides for indemnification 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, the possibility of the Fund being unable to meet its obligations is
remote and thus, in the opinion of Massachusetts counsel to the Fund, the risk
to Fund 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 pur
chase) 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.

 
   Master/Feeder Conversion. The Fund reserves the right to seek to achieve its
investment objective by investing all of its investable assets in a
diversified, open-end management investment company having the same investment
objective and policies and substantially the same investment restrictions as
those applicable to the Fund. 
 

   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.

                               33
<PAGE>

                       THE DEAN WITTER FAMILY OF FUNDS

MONEY MARKET FUNDS
Dean Witter Liquid Asset Fund Inc.
Dean Witter Tax-Free Daily Income Trust
Dean Witter U.S. Government Money Market Trust
Dean Witter California Tax-Free Daily Income Trust
Dean Witter New York Municipal Money Market Trust

EQUITY FUNDS
Dean Witter American Value Fund
Dean Witter Natural Resource Development
 Securities Inc.
Dean Witter Dividend Growth Securities Inc. 
Dean Witter Developing Growth Securities Trust 
Dean Witter World Wide Investment Trust 
Dean Witter Value-Added Market Series 
Dean Witter Utilities Fund 
Dean Witter Capital Growth Securities 
Dean Witter European Growth Fund Inc. 
Dean Witter Pacific Growth Fund Inc. 
Dean Witter Precious Metals and Minerals Trust 
Dean Witter Health Sciences Trust 
Dean Witter Global Dividend Growth Securities 
Dean Witter Global Utilities Fund 
Dean Witter International SmallCap Fund 
Dean Witter Mid-Cap Growth Fund 
Dean Witter Balanced Growth Fund 
Dean Witter Capital Appreciation Fund 
Dean Witter Information Fund 
Dean Witter Japan Fund 
Dean Witter Income Builder Fund 
Dean Witter Special Value Fund 
Dean Witter Financial Services Trust 
Dean Witter Market Leader Trust 

ASSET ALLOCATION FUNDS 
Dean Witter Strategist Fund 
Dean Witter Global Asset Allocation Fund 

ACTIVE ASSETS ACCOUNT PROGRAM 
Active Assets Money Trust 
Active Assets Tax-Free Trust 
Active Assets California Tax-Free Trust 
Active Assets Government Securities Trust

FIXED-INCOME FUNDS 
Dean Witter High Yield Securities Inc. 
Dean Witter Tax-Exempt Securities Trust 
Dean Witter U.S. Government Securities Trust 
Dean Witter Federal Securities Trust 
Dean Witter Convertible Securities Trust 
Dean Witter California Tax-Free Income Fund 
Dean Witter New York Tax-Free Income Fund 
Dean Witter World Wide Income Trust 
Dean Witter Intermediate Income Securities 
Dean Witter Global Short-Term Income Fund Inc. 
Dean Witter Multi-State Municipal Series Trust 
Dean Witter Short-Term U.S. Treasury Trust
Dean Witter Diversified Income Trust 
Dean Witter Limited Term Municipal Trust
Dean Witter Short-Term Bond Fund 
Dean Witter National Municipal Trust 
Dean Witter High Income Securities 
Dean Witter Balanced Income Fund 
Dean Witter Hawaii Municipal Trust 
Dean Witter Intermediate Term U.S. Treasury Trust 

DEAN WITTER RETIREMENT SERIES 
Liquid Asset Series 
U.S. Government Money Market Series 
U.S. Government Securities Series 
Intermediate Income Securities Series
American Value Series 
Capital Growth Series 
Dividend Growth Series 
Stategist Series 
Utilities Series 
Value-Added Market Series 
Global Equity Series

<PAGE>
 

Dean Witter
Mid-Cap Growth 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

Barry Fink
Vice President, Secretary and
General Counsel

Kirk Balzer
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.

DEAN WITTER
MID-CAP
GROWTH FUND

PROSPECTUS--JULY 28, 1997




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