MORGAN STANLEY DEAN WITTER AMERICAN VALUE FUND
497, 1998-08-21
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<PAGE>
                                                Filed Pursuant to Rule 497(e)
                                                Registration File No.: 2-66269



   
                         PROSPECTUS
                         MAY 1, 1998,
                         AS REVISED AUGUST 21, 1998


                         Morgan Stanley Dean Witter American Value Fund (the
"Fund") is an open-end diversified management investment company whose
investment objective is long-term capital growth consistent with an effort to
reduce volatility. The Fund invests principally in common stock of companies in
industries which, at the time of the investment, are believed to be
attractively valued given their above average relative earnings growth
potential at that time. (See "Investment Objective and Policies.")
    

                         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 arrange- ments 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. (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 May 1, 1998, 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.


   
                         Morgan Stanley Dean Witter
                         American Value 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/ 9
Investment Objective and Policies/ 10
 Risk Considerations/ 14
Investment Restrictions/ 17
Purchase of Fund Shares/ 18
Shareholder Services/ 29
Redemptions and Repurchases/ 32
Dividends, Distributions and Taxes/ 33
Performance Information/ 34
   
Additional Information/ 35
    





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.





THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURI-TIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPEC-TUS. ANY REPRESENTATION TO THE CONTRARY IS
A CRIMINAL OFFENSE.

                         MORGAN STANLEY DEAN WITTER
                         DISTRIBUTORS INC.,
                         DISTRIBUTOR
<PAGE>

PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------


   
<TABLE>
<S>                <C>
- --------------------------------------------------------------------------------------------------------------------------
The                The Fund, a Massachusetts business trust, is an open-end diversified management investment
Fund               company investing principally in industries which, at the time of investment, are believed to be
                   attractively valued given their above average relative earnings growth potential at that time (see
                   page 9).
- --------------------------------------------------------------------------------------------------------------------------
Shares Offered     Shares of beneficial interest with $0.01 par value (see page 35). The Fund offers four Classes
                   of shares, each with a different combination of sales charges, ongoing fees and other features
                   (see pages 18-28).
- --------------------------------------------------------------------------------------------------------------------------
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 ($25 million for
                   certain qualified plans) or more and to certain other limited categories of investors. For the
                   purpose of meeting the minimum $5 million (or $25 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 Morgan Stanley Dean Witter
                   Advisors Inc. serves as investment manager ("Morgan Stanley Dean Witter Funds") that are
                   sold with a front-end sales charge, and concurrent investments in Class D shares of the Fund
                   and other Morgan Stanley Dean Witter Funds that are multiple class funds, will be aggregated.
                   The minimum subsequent investment is $100 (see page 18).
- -------------------------------------------------------------------------------------------------------------------------
Investment         The investment objective of the Fund is capital growth consistent with an effort to reduce volatility.
Objective
- --------------------------------------------------------------------------------------------------------------------------
Investment         Morgan Stanley Dean Witter Advisors Inc., the Investment Manager of the Fund, and its
Manager            wholly-owned subsidiary, Morgan Stanley Dean Witter Services Company Inc., serve in various
                   investment management, advisory, management and administrative capacities to 102 investment
                   companies and other portfolios with assets of approximately $115.9 billion at July 31, 1998 (see
                   page 9).
- --------------------------------------------------------------------------------------------------------------------------
Management         The Investment Manager receives a monthly fee at an annual rate of 0.625 of 1% of daily net
Fee                assets up to $250 million in net assets; 0.50 of 1% of daily net assets over $250 million but not
                   exceeding $2.5 billion; 0.475 of 1% of daily net assets exceeding $2.5 billion but not exceeding
                   $3.5 billion; 0.45 of 1% of daily net assets exceeding $3.5 billion but not exceeding $4.5 billion;
                   and 0.425 of 1% of the daily net assets exceeding $4.5 billion (see page 9).
- --------------------------------------------------------------------------------------------------------------------------
Distributor and    Morgan Stanley Dean Witter Distributors Inc. is the Distributor of the Fund's shares. The Fund
Distribution Fee   has adopted a distribution plan pursuant to Rule 12b-1 under the Investment Company Act (the
                   "12b-1 Plan") with respect to the distribution fees paid by the Class A, Class B and Class C
                   shares of the Fund to the 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 18 and 27).
- --------------------------------------------------------------------------------------------------------------------------
Alternative        Four classes of shares are offered:
Purchase
Arrangements       o  Class A shares are offered with a front-end sales charge, starting at 5.25% and reduced for
                   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
                   18, 21 and 27).
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

                                       2
<PAGE>


   
<TABLE>
<S>                                                                              <C>
- --------------------------------------------------------------------------------
                   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 aggregate net sales of the Fund's Class B shares since
                   implementation of the 12b-1 Plan on April 30, 1984 or (b) the average daily net assets of Class B
                   attributable to shares issued since implementation of the 12b-1 Plan. All shares of the Fund held prior
                   to July 28, 1997, other than shares which were purchased prior to April 30, 1984 (and, with respect to
                   such shares, certain shares acquired through reinvestment of dividends and capital gains
                   distributions), have been designated Class B shares. Shares which were purchased prior to April 30,
                   1984 (and, with respect to such shares, certain shares acquired through reinvestment of dividends and
                   capital gains distributions) have been designated Class D shares. Shares held before May 1, 1997 that
                   have been designated Class B shares 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 18, 24 and 27).

                   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 18, 26 and 27).

                   o Class D shares are offered only to investors meeting an initial investment minimum of $5 million ($25
                   million for certain qualified plans) 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 18, 26 and 27).
- ----------------------------------------------------------------------------------------------------------------------------
Dividends and      It is anticipated that distributions of income and net short-term capital gains, if any, will be made
Capital Gains      semi-annually. Net long-term capital gains, if any, are distributed at least annually. The Fund may,
Distributions      however, determine to retain all or part of any net long-term capital gains in any year for
                   reinvestment. Dividends and capital gains 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 29 and 33).
- -------------------------------------------------------------------------------------------------------------------------------
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 32).
- -------------------------------------------------------------------------------------------------------------------------------
Risks              The net asset value of the Fund's shares will fluctuate with changes in the market value of its
                   portfolio securities. Emphasis on attractive industries may run contrary to general market assessments
                   and may involve risks associated with departure from typical S&P 500 industry weightings. It should be
                   recognized that the Fund's investments in small and medium-capitalization companies involve greater
                   risk than is customarily associated with investing in larger, more established companies. The Fund may
                   invest in the securities of foreign issuers which entails additional risks.The Fund may also invest in
                   futures and options which may be considered speculative in nature and may involve greater risks than
                   those customarily assumed by other investment companies which do not invest in such instruments (see
                   pages 14-16).
- -------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

The above is qualified in its entirety by the detailed information appearing
                          elsewhere in the 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 December 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 ........................................       0.50%           0.50%           0.50%          0.50%
12b-1 Fees (5) (6) .....................................       0.25%           0.83%           1.00%          None
Other Expenses .........................................       0.13%           0.13%           0.13%          0.13%
Total Fund Operating Expenses (7) ......................       0.88%           1.46%           1.63%          0.63%
</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
      July 28, 1997. Accordingly, "Total Fund Operating Expenses," as shown
      above with respect to those Classes, are estimates 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 ......................................................      $61        $79         $ 99        $155
  Class B ......................................................      $65        $76         $100        $175
  Class C ......................................................      $27        $51         $ 89        $193
  Class D ......................................................      $ 6        $20         $ 35        $ 79
You would pay the following expenses on the same $1,000
investment assuming no redemption at the end of the period:
  Class A ......................................................      $61        $79         $ 99        $155
  Class B ......................................................      $15        $46         $ 80        $175
  Class C ......................................................      $17        $51         $ 89        $193
  Class D ......................................................      $ 6        $20         $ 35        $ 79
</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 "Redemptions 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 per share data and ratios for a share of beneficial interest
outstanding throughout each period have been audited by PricewaterhouseCoopers
LLP, independent accountants. The financial highlights should be read in
conjunction with the financial statements and notes thereto and the unqualified
report of the independent accountants which are contained in the Statement of
Additional Information. Further information about the performance of the Fund
is contained in the Fund's Annual Report to Shareholders, which may be obtained
without charge upon request to the Fund.
    



<TABLE>
<CAPTION>
                                            For the Year Ended December 31,
                                 -----------------------------------------------------
                                     1997*++         1996          1995        1994
                                 -------------- -------------- ----------- -----------
<S>                              <C>            <C>            <C>         <C>
CLASS B SHARES
PER SHARE OPERATING
PERFORMANCE:
Net asset value, beginning
 of period .....................    $27.01        $27.16        $21.21       $23.10
                                   -------        -------       -------     --------
Net investment income
 (loss) ........................    (0.10)         (0.08)         0.01         --
Net realized and
 unrealized gain (loss) ........     8.34           2.86          8.87        (1.57)
                                   ---------      ---------     -------     --------
Total from investment
 operations ....................     8.24           2.78           8.88       (1.57)
                                   ---------      ---------     -------     --------
Less dividends and
 distributions from:
 Net investment income                --           (0.01)          --          --
 Net realized gain .............    (5.74)         (2.92)        (2.93)       (0.32)
 Paid-in-capital ...............      --             --            --          --
                                   ---------      ---------     --------    --------
Total dividends and
 distributions .................    (5.74)         (2.93)        (2.93)       (0.32)
                                   ---------      ---------     --------    --------
Net asset value, end of
 period ........................   $29.51         $27.01        $27.16       $21.21
                                   =========      =========     ========    ========
TOTAL INVESTMENT
RETURN+ ........................    31.55%         10.53%        42.20%       (6.75)%
RATIOS TO AVERAGE NET
ASSETS:
Expenses .......................     1.46%          1.53%         1.61%        1.71%
Net investment income
 (loss) ........................    (0.34)%        (0.33)%        0.06%        0.01%
SUPPLEMENTAL DATA:
Net assets, end of period,
 in millions ...................   $4,078         $3,099        $2,389       $1,490
Portfolio turnover rate ........      275%           279%          256%         295%
Average commission rate
 paid ..........................  $0.0563        $0.0590           --          --



<CAPTION>
                                                     For the Year Ended December 31,
                                 -----------------------------------------------------------------------
                                     1993        1992        1991        1990        1989        1988
                                 ----------- ----------- ----------- ----------- ----------- -----------
<S>                              <C>         <C>         <C>         <C>         <C>         <C>
CLASS B SHARES
PER SHARE OPERATING
PERFORMANCE:
Net asset value, beginning
 of period .....................    $20.93     $20.66      $14.39       $14.81     $13.19      $12.21
                                  --------    -------     -------     --------    -------     -------
Net investment income
 (loss) ........................     (0.09)      0.03        0.05         0.24       0.34        0.29
Net realized and
 unrealized gain (loss) ........      3.94       0.71        7.90        (0.38)      2.99        1.03
                                  --------    -------     -------     --------    -------     -------
Total from investment
 operations ....................      3.85       0.74        7.95        (0.14)      3.33        1.32
                                  --------    -------     -------     --------    -------     -------
Less dividends and
 distributions from:
 Net investment income               (0.01)     (0.03)      (0.03)      (0.28)      (0.32)      (0.33)
 Net realized gain .............     (1.67)     (0.44)      (1.65)       --         (1.39)       --
 Paid-in-capital ...............      --         --          --          --          --         (0.01)
                                  --------    --------    --------    --------    --------    --------
Total dividends and
 distributions .................     (1.68)    (0.47)       (1.68)      (0.28)      (1.71)      (0.34)
                                  --------    --------    --------    --------    --------    --------
Net asset value, end of
 period ........................    $23.10    $20.93       $20.66      $14.39      $14.81      $13.19
                                  ========    ========    ========    ========    ========    ========
TOTAL INVESTMENT
RETURN+ ........................     18.70%     3.84%       56.26%      (0.90)%     25.39%      10.84%
RATIOS TO AVERAGE NET
ASSETS:
Expenses .......................      1.61%     1.72%        1.58%       1.70%       1.66%       1.78%
Net investment income
 (loss) ........................     (0.59)%    0.18%        0.29%       1.67%       2.23%       2.15%
SUPPLEMENTAL DATA:
Net assets, end of period,
 in millions ...................    $1,218      $459         $227         $89        $100         $90
Portfolio turnover rate ........       276%      305%         264%       234%         196%        133%
Average commission rate
 paid ..........................      --        --            --         --          --         --
</TABLE>

- ----------
*     Prior to July 28, 1997, the Fund issued one class of shares. All shares
      of the Fund held prior to that date, other than shares which were
      purchased prior to April 30, 1984 (and with respect to such   
      shares, certain shares acquired through reinvestment of
      dividends and capital gains distributions (collectively the "Old
      Shares")), have been designated Class B shares. The Old Shares have
      been designated Class D shares.

++    The per share amounts were computed using an average number of shares
      outstanding during the period.

+     Does not reflect the deduction of sales charge. Calculated based on the
      net asset value as of the last business day of the period.


                                       6
<PAGE>

FINANCIAL HIGHLIGHTS, continued
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                        For the Period
                                                        July 28, 1997*
                                                            Through
                                                      December 31, 1997++
                                                    ----------------------
<S>                                                 <C>
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ..............       $31.87
                                                        ----------
Net investment income .............................         0.05
Net realized and unrealized gain ..................         2.32
                                                        ----------
Total from investment operations ..................         2.37
                                                        ----------
Less distributions from net realized gain .........        (4.65)
                                                        ----------
Net asset value, end of period ....................       $29.59
                                                        ==========
TOTAL INVESTMENT RETURN+ ..........................         7.70%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses ..........................................         0.92%(2)
Net investment income .............................         0.38%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands ...........      $15,844
Portfolio turnover rate ...........................          275%
Average commission rate paid ......................      $0.0563
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ..............       $31.87
                                                        --------------
Net investment loss ...............................        (0.05)
Net realized and unrealized gain ..................         2.32
                                                        --------------
Total from investment operations ..................         2.27
                                                        --------------
Less distributions from net realized gain .........       (4.65)
                                                        --------------
Net asset value, end of period ....................      $29.49
                                                        ==============
TOTAL INVESTMENT RETURN+ ..........................        7.39%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses ..........................................        1.66%(2)
Net investment loss ...............................       (0.36)%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands ...........     $12,204
Portfolio turnover rate ...........................         275%
Average commission rate paid ......................     $0.0563
</TABLE>

- ----------
*     The date shares were first issued.

++    The per share amounts were computed using an average number of shares
      outstanding during the period.

+     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.

                                       7
<PAGE>

FINANCIAL HIGHLIGHTS, continued
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                       For the Period
                                                       July 28, 1997*
                                                           Through
                                                     December 31, 1997++
                                                    --------------------
<S>                                                 <C>
CLASS D SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period ..............      $31.87
                                                         --------
Net investment income .............................        0.07
Net realized and unrealized gain ..................        2.34
                                                         --------
Total from investment operations ..................        2.41
                                                         --------
Less distributions from net realized gain .........      (4.65)
                                                         --------
Net asset value, end of period ....................     $29.63
                                                         ========
TOTAL INVESTMENT RETURN+ ..........................       7.83%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses ..........................................       0.64%(2)
Net investment income .............................       0.50%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands ...........    $49,772
Portfolio turnover rate ...........................        275%
Average commission rate paid ......................    $0.0563
</TABLE>

- ----------
*     The date shares were first issued. Shareholders who held shares of the
      Fund prior to July 28, 1997 (the date the Fund converted
      to a multiple class share structure) should refer to the Financial
      Highlights of Class B to obtain the historical per share data and ratio
      information of their shares.

++    The per share amounts were computed using an average number of shares
      outstanding during the period.

+     Calculated based on the net asset value as of the last business day of
      the period.

(1)   Not annualized.

(2)   Annualized.


                                       8
<PAGE>

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

   
       Morgan Stanley Dean Witter American Value Fund (the "Fund") (formerly
named Dean Witter American Value Fund) is an open-end diversified management
investment company incorporated in Maryland on December 13, 1979. The Fund was
reorganized as a trust of the type commonly known as a "Massachusetts business
trust" on April 30, 1987, at which time its name was changed from Dean Witter
Industry-Valued Securities Inc. to Dean Witter American Value Fund.

       Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" 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 is a
wholly-owned subsidiary of Morgan Stanley Dean Witter & 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.
The Investment Manager, which was incorporated in July, 1992 under the name
Dean Witter InterCapital Inc., changed its name to Morgan Stanley Dean Witter
Advisors Inc. on June 22, 1998.

       MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean
Witter Services Company, Inc. ("MSDW Services"), serve in various investment
management, advisory, management and administrative capacities to a total of
102 investment companies, 28 of which are listed on the New York Stock
Exchange, with combined total assets of approximately $111.6 billion as of July
31, 1998. The Investment Manager also manages portfolios of pension plans,
other institutions and individuals which aggregated approximately $4.3 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. MSDW Advisors has retained MSDW Services to perform the
aforementioned administrative services for the Fund.
    

       The Fund's Board of Trustees reviews the various services provided by or
under the direction of the Investment Manager to ensure that the Fund's general
investment policies and programs are being properly carried out and that
administrative services are being provided 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 net assets of the Fund determined as of the
close of each business day: 0.625% of the portion of daily net assets not
exceeding $250 million; 0.50% of the portion of daily net assets exceeding $250
million but not exceeding $2.5 billion; 0.475% of the portion of daily net
assets exceeding $2.5 billion but not exceeding $3.5 billion; 0.45% of the
portion of daily net assets exceeding $3.5 billion but not exceeding $4.5
billion; and 0.425% of the portion of daily net assets exceeding $4.5 billion.
For the fiscal year ended December 31, 1997, the Fund accrued total
compensation to the Investment Manager amounting to 0.50% of the Fund's average
daily net assets and the total expenses of Class B amounted to 1.46% of the
Fund's average daily net assets of Class B. Shares of Class A, Class C and
Class D were first issued on July 28, 1997. The expenses of the Fund include:
the fee of the Investment Manager; the fee pursuant to the Plan of Distribution
(see "Purchase of Fund Shares"); taxes, transfer agent, custodian and auditing
fees; certain legal fees; and printing and other expenses relating to the
Fund's operations which are not expressly assumed by the Investment Manager
under its Investment Management Agreement with the Fund.


                                       9
<PAGE>

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

The investment objective of the Fund is long-term capital growth consistent
with an effort to reduce volatility. There is no assurance that the Fund's
objective will be achieved. The investment objective may not be changed without
the approval of the shareholders of the Fund. The investment policies discussed
below may be changed without shareholder approval.

       The Fund seeks to achieve its investment objective by investing in a
diversified portfolio of securities consisting principally of 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. The Investment Manager seeks to invest the assets of the
Fund in those industries that, at the time of investment, are attractively
valued given their above average relative earnings growth potential at that
time. Therefore, the Fund is typically over-weighted in those sectors deemed to
be attractive given their potential for above average earnings growth.

       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.

       The Investment Manager seeks to identify what stage of the business
cycle the economy is in and which industry groups have historically
outperformed the overall market during that stage of the cycle, i.e.,
typically, groups that tend to have the highest relative earnings growth at
that point in the cycle. The Investment Manager also analyzes secular trends
such as demographics, international trade, etc., that could cause the current
cycle to differ from prior cycles and attempts to weight the portfolio
appropriately, given those factors.

       Following selection of the Fund's specific investments, the Investment
Manager will attempt to allocate the assets of the Fund so as to reduce the
volatility of its portfolio. In doing so, the Fund may hold a portion of its
portfolio in fixed-income securities (including zero coupon securities) in an
effort to moderate extremes of price fluctuations. The Fund may invest up to
35% of its portfolio in common stocks of non-U.S. companies, including American
Depository Receipts (which are custody receipts with respect to foreign
securities), in companies in industries which have not been determined to be
attractively valued or moderately attractively valued by the Investment
Manager, and in convertible debt securities and warrants, convertible preferred
securities, U.S. Government securities (securities issued or guaranteed as to
principal and interest by the United States or its agencies and
instrumentalities) and investment grade corporate debt securities when, in the
opinion of the Investment Manager, the projected total return on such
securities is equal to or greater than the expected total return on common
stocks, or when such holdings might be expected to reduce the volatility of the
portfolio, and in money market instruments under any one or more of the
following circumstances: (i) pending investment of proceeds of the sale of Fund
shares or of portfolio securities; (ii) pending settlement of purchases of
portfolio securities; or (iii) to maintain liquidity for the purpose of meeting
anticipated redemptions. Greater than 35% of the Fund's total assets may be
invested in money market instruments to maintain, temporarily, a "defensive"
posture when, in the opinion of the Investment Manager, it is advisable to do
so because of economic or market conditions.

       Because prices of stocks fluctuate from day to day, the value of an
investment in the Fund will vary based upon the Fund's investment performance.
The Fund is intended for long-term investors who can accept the risks involved
in seeking long-term growth of capital through investment in the securities of
large, medium and small-capitalization companies. Emphasis on attractive
industries may run contrary to general market assessments and may involve risks
associated with departure from typical S&P 500 industry weightings. It should
be recog-


                                       10
<PAGE>

nized that investing in small and medium-capitalization companies involves
greater risk than is customarily associated with investing in more established
companies.

       Convertible Securities. A convertible security is a bond, debenture,
note, preferred stock or other security that may be converted into or exchanged
for a prescribed amount of common stock of the same or a different issuer
within a particular period of time at a specified price or formula. 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). For a discussion of the
risks of investing in convertible securities, see "Risk Considerations" below.

       The Fund may purchase securities on a when- issued or delayed delivery
basis, may purchase or sell securities on a forward commitment basis and may
purchase securities on a "when, as and if issued" basis as discussed under
"Risk Considerations" below.


OPTIONS AND FUTURES TRANSACTIONS

       The Fund 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 and OTC call options written by the Fund will be exercisable by
the purchaser only on a specific date).

       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.

       Purchasing Call and Put Options. The Fund may invest up to 10% of its
total assets in the purchase of put and call options on securities and stock
indexes, with a maximum of 5% of the Fund's total assets invested in stock
index options. The Fund may purchase put options on securities which it holds
(or has the right to acquire) in its portfolio


                                       11
<PAGE>

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 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 "Risks of Options on Indexes" in the Statement of Additional Information.

       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 securities (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
securities (or anticipated portfolio securities) against changes in their
prices.

       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.

       Risks of 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 con-


                                       12
<PAGE>

tinue 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.

       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.

       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.

       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.

       Rule 144A under the Securities Act permits the Fund to sell restricted
securities to qualified institutional buyers without limitation. The Investment
Manager, pursuant to procedures adopted by the Trustees of the Fund, will make
a determination as to the liquidity of each restricted security purchased by
the Fund. If a restricted security is determined to be "liquid," such security
will not be included within the category "illiquid securities," which under
current policy may not exceed 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.

       Foreign Securities. The Fund may invest up to 35% of the value of its
total assets, at the time of purchase, in securities issued by foreign issuers.
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. For a discussion
of the risks of investing in foreign securities, see "Risk Considerations"
below.


                                       13
<PAGE>

SPECIFIC INVESTMENT POLICIES

       The Fund has adopted the following specific policies which are not
fundamental investment policies and may be changed by the Board of Trustees.

       1. At least 65% of the Fund's total assets will be invested in common
stocks of U.S. companies which, at the time of purchase, were in undervalued or
moderately valued industries as determined by the Investment Manager, except as
stated in Paragraph (3) below.

       2. Up to 35% of the value of the Fund's total assets may be invested in:
(a) common stocks of non-U.S. companies, or companies in non-classified
industries, including American Depository Receipts (which are custody receipts
with respect to foreign securities) (the Fund's investments in unlisted foreign
securities are deemed to be illiquid securities, which under the Fund's current
investment policies may not in the aggregate amount to more than 15% of the
Fund's net assets); (b) convertible debt securities (bonds, debentures,
corporate notes, preferred stock and other securities) which are convertible
into common stock; (c) U.S. Government securities and investment grade
corporate debt securities when, in the opinion of the Investment Manager, the
projected total return on such securities is equal to or greater than the
expected total return on equity securities, or when such holdings might be
expected to reduce the volatility of the portfolio; and (d) money market
instruments under any one or more of the following circumstances: (i) pending
investment of proceeds of sale of shares of the Fund or of portfolio
securities; (ii) pending settlement of purchases of portfolio securities; or
(iii) to maintain liquidity for the purpose of meeting anticipated redemptions.
 

       3. Notwithstanding any of the foregoing limitations, the Fund may invest
more than 35% of the Fund's total assets in money market instruments to
maintain, temporarily, a "defensive" posture when, in the opinion of the
Investment Manager, it is advisable to do so because of economic or market
conditions, including, for example, times during which the Investment Manager
believes the risk, or volatility, relative to expected returns of the
securities it monitors, is excessive.

       The foregoing limitations apply at the time of acquisition based on the
last determined market value of the Fund's assets, and any subsequent change in
any applicable percentage resulting from market fluctuations or other changes
in total assets will not require elimination of any security from the
portfolio.


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 small and
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.

       Foreign Securities. Foreign securities investments may be affected by
changes in currency rates or exchange control regulations, changes in
governmental administration or economic or monetary policy (in the United
States and abroad) or changed circumstances in dealings between nations.
Fluctuations in the relative rates of exchange between the currencies of
different nations will affect the value of the Fund's investments denominated
in foreign currency. Changes in foreign currency exchange rates relative to the
U.S. dollar will affect the U.S. dollar value of the Fund's assets denominated
in that currency and thereby impact upon the Fund's total return on such
assets. When purchasing foreign securities, the Fund will generally enter into
foreign currency exchange transactions or forward foreign exchange contracts to
facilitate settlement. The Fund will utilize forward foreign exchange contracts
in these instances as an attempt to limit the effect of changes in the
relationship between the U.S. dollar and the foreign currency during the period
between the trade date and settlement date for the transaction.


                                       14
<PAGE>

       Foreign currency exchange rates are determined by forces of supply and
demand on the foreign exchange markets. These forces are themselves affected by
the international balance of payments and other economic and financial
conditions, government intervention, speculation and other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of
the exchanges on which the currencies trade. The Fund will incur costs in
connection with conversions between various currencies.


       Investments in foreign securities will also occasion risks relating to
political and economic developments abroad, including the possibility of
expropriations or confiscatory taxation, limitations on the use or transfer of
Fund assets and any effects of foreign social, economic or political
instability. Foreign companies are not subject to the regulatory requirements
of U.S. companies and, as such, there may be less publicly available
information about such companies. Moreover, foreign companies are not subject
to uniform accounting, auditing and financial reporting standards and
requirements comparable to those applicable to U.S. companies. Finally, in the
event of a default of any foreign debt obligations, it may be more difficult
for the Fund to obtain or enforce a judgment against the issuers of such
securities.


       Securities of foreign issuers may be less liquid than comparable
securities of U.S. issuers and, as such, their price changes may be more
volatile. Furthermore, foreign exchanges and broker-dealers are generally
subject to less government and exchange scrutiny and regulation than their
American counterparts. Brokerage commissions, dealer concessions and other
transaction costs may be higher on foreign markets than in the U.S. In
addition, differences in clearance and settlement procedures on foreign markets
may occasion delays in settlements of the Fund's trades effected in such
markets. As such, the inability to dispose of portfolio securities due to
settlement delays could result in losses to the Fund due to subsequent declines
in value of such securities and the inability of the Fund to make intended
security purchases due to settlement problems could result in a failure of the
Fund to make potentially advantageous investments. Investments in certain
issuers may be speculative due to certain political risks and may be subject to
substantial price fluctuations.


       Convertible Securities. 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, the convertible
security 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.


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


                                       15
<PAGE>

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.


       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. There is no overall limit on the percentage of the Fund's assets
which may be committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis. An increase in the percentage of the
Fund's assets committed to the purchase of securities on a when-issued, delayed
delivery or forward commitment basis may increase the volatility of the Fund's
net asset value.


       When, As and If Issued Securities. The Fund may purchase securities on a
"when, as and if issued" basis under which the issuance of the security depends
upon the occurrence of a subsequent event, such as approval of a merger,
corporate reorganization, leveraged buyout or debt restructuring. If the
anticipated event does not occur and the securities are not issued, the Fund
will have lost an investment opportunity. There is no overall limit on the
percentage of the Fund's assets which may be committed to the purchase of
securities on a "when, as and if issued" basis. An increase in the percentage
of the Fund's assets committed to the purchase of securities on a "when, as and
if issued" basis may increase the volatility of the Fund's net asset value.

       Year 2000. The investment management services provided to the Fund by
the Investment Manager and the services provided to shareholders by the
Distributor and the Transfer Agent depend on the smooth functioning of their
computer systems. Many computer software systems in use today cannot recognize
the year 2000, but revert to 1900 or some other date, due to the manner in
which dates were encoded and calculated. That failure could have a negative
impact on the handling of securities trades, pricing and account services. The
Investment Manager, the Distributor and the Transfer Agent have been actively
working on necessary changes to their own computer systems to prepare for the
year 2000 and expect that their systems will be adapted before that date, but
there can be no assurance that they will be successful, or that interaction
with other non-complying computer systems will not impair their services at
that time.


       In addition, it is possible that the markets for securities in which the
Fund invests may be detrimentally affected by computer failures throughout the
financial services industry beginning January 1, 2000. Improperly functioning
trading systems may result in settlement problems and liquidity issues. In
addition, corporate and governmental data processing errors may result in
production problems for individual companies and overall economic
uncertainties. Earnings of individual issuers will be affected by remediation
costs, which may be substantial and may be reported inconsistently in U.S. and
foreign financial statements. Accordingly, the Fund's investments may be
adversely affected.



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., Morgan Stanley & Co. Incorporated and other broker--
    


                                       16
<PAGE>

   
dealers that are affiliates of the Investment Manager, and 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 MSDW Advisors' Sector Rotation Group, which manages
5 equity funds and fund portfolios with approximately $6.9 billion in assets as
of July 31, 1998. Anita H. Kolleeny, Senior Vice President of MSDW Advisors and
head of MSDW Advisors' Sector Rotation Group, has been the primary portfolio
manager of the Fund for over five years and is assisted by Michelle Kaufman,
Vice President of MSDW Advisors. Ms. Kolleeny has been a portfolio manager at
MSDW Advisors for over five years. Ms. Kaufman is a member of MSDW Advisors'
Sector Rotation Group and, prior to joining MSDW Advisors in September 1993,
was a securities analyst with Woodward and Associates (March-August, 1993) and
JRO and Associates (December, 1992).
    


       Although the Fund does not 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. It is anticipated that, under normal
circumstances, the Fund's portfolio turnover rate will not exceed 400% in any
one year. The Fund will incur brokerage costs commensurate with its portfolio
turnover rate. Short term gains and losses may result from such portfolio
transactions. See "Dividends, Distributions and Taxes" for a discussion of the
tax implications of the Fund's trading policy. A more extensive discussion of
the Fund's portfolio brokerage policies is set forth in the Statement of
Additional Information.


   
       Orders for transactions in portfolio securities and commodities are
placed for the Fund with a number of brokers and dealers, including Dean Witter
Reynolds Inc., Morgan Stanley & Co. Incorporated and other brokers and dealers
that are affiliates of the Investment Manager. The Fund may incur brokerage
commissions on transactions conducted through such affiliates. Pursuant to an
order of the Securities and Exchange Commission the Fund may effect principal
transactions in certain money market instruments with Dean Witter Reynolds Inc.
 
    

INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------

       The investment restrictions listed below are among the restrictions
which have been adopted by the Fund as fundamental policies. Under the
Investment Company Act of 1940, as amended (the "Act"), a fundamental policy
may not be changed without the vote of a majority of the outstanding voting
securities of the Fund, as defined in the Act. For purposes of the following
limitations: (i) all percentage limitations apply immediately after a purchase
or initial investment; and (ii) any subsequent change in any applicable
percentage resulting from market fluctuations or other changes in total or net
assets does not require elimination of any security from the portfolio.


       The Fund may not:

       1. Invest more than 5% of the value of its total assets in the
securities of any one issuer (other than obligations issued, or guaranteed by,
the United States Government, its agencies or instrumentalities).


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


       3. Invest more than 25% 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 or to cash equivalents.



                                       17
<PAGE>

       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.

       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
Morgan Stanley Dean Witter Distributors Inc. ("MSDW Distributors" or the
"Distributor"), an affiliate of the Investment Manager, shares of the Fund are
distributed by the Distributor and offered by Dean Witter Reynolds Inc.
("DWR"), a selected dealer and subsidiary of Morgan Stanley Dean Witter & Co.,
and other brokers and dealers which have entered into agreements with the
Distributor ("Selected Broker-Dealers"). It is anticipated that DWR will
undergo a change of corporate name which is expected to incorporate the brand
name of "Morgan Stanley Dean Witter," pending approval of various regulatory
authorities. 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 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 ($25 million for certain qualified plans), 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 Arrangements-- 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 only available to persons investing $5 million ($25
million for certain qualified plans) or more and to certain other limited
categories of investors. For the purpose of meeting the minimum $5 million (or
$25 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 Morgan Stanley Dean Witter
Funds that are multiple class funds ("Morgan Stanley Dean Witter Multi-Class
Funds") and shares of Morgan Stanley Dean Witter Funds sold with a front-end
sales charge ("FSC Funds") and concurrent investments in Class D shares of the
Fund and other Morgan Stanley Dean Witter Multi-Class Funds will be aggregated.
Subsequent purchases of $100 or more may be
    


                                       18
<PAGE>

   
made by sending a check, payable to Morgan Stanley Dean Witter American Value
Fund, directly to Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent" or
"MSDW Trust") at P.O. Box 1040, Jersey City, NJ 07303 or by contacting a Morgan
Stanley Dean Witter Financial Advisor or other Selected Broker-Dealer
representative 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 $1,000 within the
first twelve months. The minimum initial purchase in the case of an "Education
IRA" is $500, if the Distributor has reason to believe that additional
investments will increase the investment in the account to $1,000 within three
years. In the case of investments pursuant to (i) Systematic Payroll Deduction
Plans (including Individual Retirement Plans), (ii) the MSDW Advisors mutual
fund asset allocation program and (iii) fee-based programs approved by the
Distributor, pursuant to which participants pay an asset based fee for services
in the nature of investment advisory, administrative and/or brokerage services,
the Fund, in its discretion, may accept investments without regard to any
minimum amounts which would otherwise be required, provided, in the case of
Systematic Payroll Deduction Plans, that the Distributor 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 requested 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 distributions. Sales
personnel of a Selected Broker-Dealer are compensated for selling shares of the
Fund at the time of their sale 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


                                       19
<PAGE>

against those Classes and not against all assets of the Fund and, accordingly,
such charges against 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 the 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 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 12b-1 Plan on April 30, 1984 (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
inception of the 12b-1 Plan upon which a CDSC has been imposed or waived, or
(b) the average daily net assets of Class B attributable to shares issued, net
of related shares redeemed, since inception of the 12b-1 Plan. 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


                                       20
<PAGE>

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 purchase 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 (or $25 million) minimum
investment amount for Class D shares, holdings of Class A shares in all Morgan
Stanley Dean Witter Multi-Class Funds, shares of FSC Funds and shares of Morgan
Stanley 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
           CDSC 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 re-


                                       21
<PAGE>

deemed. The CDSC will not be imposed (i) in the 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 Morgan Stanley 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 Morgan Stanley 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 Morgan Stanley Dean Witter Funds
previously purchased at a price including a front-end sales charge (including
shares of the Fund and other Morgan Stanley 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
 
    


                                       22
<PAGE>

net asset value of shares of FSC Funds and Class A and Class D shares that,
together with the current investment amount, is equal to at least $5 million
($25 million for certain qualified plans), 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.

       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 Morgan Stanley 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 Morgan Stanley
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 MSDW Trust (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, administrative and/or brokerage services
(such investments are subject to all of the terms and conditions of such
programs, which may include termination fees, mandatory redemption upon
termination and such other circumstances as specified in the programs'
agreements, and restrictions on transferability of Fund shares);

       (3) employer-sponsored 401(k) and other plans qualified under Section
401(a) of the Internal Revenue Code ("Qualified Retirement Plans") with at
least 200 eligible employees and for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement;

       (4) Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement 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 Morgan Stanley Dean Witter Financial
Advisor who joined Morgan Stanley 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 Financial
Advisor'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.


                                       23
<PAGE>

       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 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 Qualified Retirement
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 implementation of
the 12b-1 Plan on April 30, 1984 (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 implementation of the 12b-1
Plan upon which a CDSC has been imposed or waived, or (b) the average daily net
assets of Class B attributable to shares issued, net of related shares
redeemed, since implementation of the 12b-1 Plan.


       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 purchased on or after July 28,
1997 by Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement, 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 Qualified Retirement 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 Qualified
Retirement 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 Morgan Stanley Dean Witter Funds acquired in
    


                                       24
<PAGE>

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:

       (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
Qualified Retirement Plan which offers investment companies managed by the
Investment Manager or its subsidiary, MSDW Services, as self-directed
investment alternatives and for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement ("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, other than shares which were purchased prior to April 30, 1984 (and,
with respect to such shares, including such proportion of shares acquired
through reinvestment of dividends and capital gains distributions as the total
number of shares acquired prior to such date bears to the total number of Fund
shares purchased and owned by the shareholder (collectively, the "Old Shares"),
have been designated Class B shares. Shares held before May 1, 1997 that have
been designated Class B shares 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 Qualified
Retirement Plan for


                                       25
<PAGE>

   
which MSDW Trust serves as Trustee or DWR's Retirement Plan Services serves as
recordkeeper pursuant to a written Recordkeeping Services Agreement, 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 Morgan Stanley 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 from the holding period for conversion.
If those shares are subsequently re-exchanged for Class B shares of a Morgan
Stanley 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.

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 ($25 million for
Qualified Retirement Plans for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement) and the following categories of investors:
(i) investors participating in the MSDW Advisors 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, administrative and/or brokerage services (subject to all
of the terms and conditions of such programs, referred to in (i) and (ii)
above, which may include termination fees, mandatory redemption upon
termination and such other circumstances as specified in the programs'
agreements, 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
    


                                       26
<PAGE>

   
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. The Old Shares have been designated Class D shares.
Investors who require a $5 million (or $25 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
Morgan Stanley 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 (or $25 million) minimum investment amount,
holdings of Class A shares in all Morgan Stanley Dean Witter Multi-Class Funds,
shares of FSC Funds and shares of Morgan Stanley 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
implementation of the 12b-1 Plan on April 30, 1984 (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 that Plan's
implementation upon which a CDSC has been imposed or waived, or (b) the average
daily net assets of Class B attributable to shares issued, net of related
shares redeemed, since implementation of the Fund's 12b-1 Plan. 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 Morgan Stanley Dean
Witter Financial Advisors 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 December 31, 1997, Class B shares of the Fund
accrued payments under the Plan amounting to $30,004,099, which amount is equal
to 0.83% of the average daily net assets of Class B for the fiscal year. These
payments were calculated pursuant to clause (a) of the compensation formula
under the Plan. All shares


                                       27
<PAGE>

held prior to July 28, 1997 (other than the Old Shares) have been designated
Class B shares. For the fiscal period July 28 through December 31, 1997, Class
A and Class C shares of the Fund accrued payments under the Plan amounting to
$7,380 and $26,712, respectively, which amounts on an annualized basis are
equal to 0.25% and 1.00% of the average daily net assets of Class A and Class
C, respectively, for such period.

       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 $72,540,376 at December 31, 1997, which was equal to 1.78% of the net
assets of Class B on such date. Because there is no requirement under the Plan
that the Distributor be reimbursed for all distribution expenses or any
requirement that the Plan be continued from year to year, such excess amount
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 in any subsequent year, except that expenses representing a gross sales
commission credited to Morgan Stanley Dean Witter Financial Advisors and other
Selected Broker-Dealer Representatives at the time of sale may be reimbursed in
the subsequent calendar year. The Distributor has advised the Fund that
unreimbursed expenses representing a gross sales commission credited to Morgan
Stanley Dean Witter Financial Advisor and other Selected Broker-Dealer
representatives at the time of sale totalled $92,652 in the case of Class C at
December 31, 1997, which amount was equal to 0.76% of the net assets of Class C
on such date, and that there were no such expenses that may be reimbursed in
the subsequent year in the case of Class A on such date. 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 stock exchange is valued at its latest sale price on that exchange,
prior to the time when 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
 


                                       28
<PAGE>

the primary market pursuant to procedures adopted by the Trustees); and (2) all
other portfolio securities for which over-the-counter market quotations are
readily available are valued at the latest bid price. When market quotations
are not readily available, including circumstances under which it is determined
by the Investment Manager that sale 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. For valuation purposes, quotations of
foreign portfolio securities, other assets and liabilities and forward
contracts stated in foreign currency are translated into U.S. dollar
equivalents at the prevailing market rates prior to the close of the New York
Stock Exchange. Dividends receivable are accrued as of the ex-dividend date or
as of the time that the relevant ex-dividend date and amounts become known.

       Short-term debt securities with remaining maturities of sixty days or
less at the time of purchase are valued at amortized cost, unless the Trustees
determine such does not reflect the securities' market value, in which case
these securities will be valued at their fair value as determined by the
Trustees.


       Certain 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 Morgan Stanley 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 CDSC (see "Redemptions and Repurchases").

       EasyInvest.SM Shareholders may subscribe to EasyInvest, an automatic
purchase plan which provides for any amount from $100 to $5,000 to be
transferred automatically from a checking or savings account, or following
redemption of shares of a Morgan Stanley 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").
    

       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").

       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


                                       29
<PAGE>

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 Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative 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 advisor.

       For further information regarding plan administration, custodial fees
and other details, investors should contact their Morgan Stanley Dean Witter
Financial Advisor or other Selected Broker-Dealer representative or the
Transfer Agent.
    


EXCHANGE PRIVILEGE

   
       Shares of each Class may be exchanged for shares of the same Class of
any other Morgan Stanley Dean Witter Multi-Class Fund without the imposition of
any exchange fee. Shares may also be exchanged for shares of the following
funds: Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust, Morgan
Stanley Dean Witter Limited Term Municipal Trust, Morgan Stanley Dean Witter
Short-Term Bond Fund and five Morgan Stanley Dean Witter funds which are money
market funds (the "Exchange Funds"). Class A shares may also be exchanged for
shares of Morgan Stanley Dean Witter Multi-State Municipal Series Trust and
Morgan Stanley Dean Witter Hawaii Municipal Trust, which are Morgan Stanley
Dean Witter Funds sold with a front-end sales charge ("FSC Funds"). Class B
shares may also be exchanged for shares of Morgan Stanley Dean Witter Global
Short-Term Income Fund Inc. ("Global Short-Term"), which is a Morgan Stanley
Dean Witter Fund offered with a CDSC. 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 Morgan Stanley Dean Witter Multi-Class Fund, any
FSC Fund, Global Short-Term 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 business day. Subsequent exchanges between any of the money
market funds and any of the Morgan Stanley Dean Witter Multi-Class Funds, FSC
Funds, Global Short-Term 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 Morgan Stanley Dean
Witter Multi-Class Fund or shares of Global Short-Term, the holding period
previously frozen when the first exchange was made resumes on the last day of
the month in which shares of a Morgan Stanley Dean Witter Multi-Class Fund or
shares of Global Short-Term are reacquired. Thus, the CDSC is based upon the
time
    


                                       30
<PAGE>

   
(calculated as described above) the shareholder was invested in shares of a
Morgan Stanley Dean Witter Multi-Class Fund or in shares of Global Short-Term
(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. 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 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 shares of Global Short-Term or Class B shares of
another Morgan Stanley Dean Witter Multi-Class 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 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 Morgan Stanley 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 Morgan Stanley
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 Dealer are referred to
their Morgan Stanley Dean Witter Financial Advisor or other Selected
Broker-Dealer representative 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 a 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 Morgan
Stanley Dean Witter Funds (for which the Exchange Privilege is available)
pursuant to this Exchange Privilege by contacting their Morgan Stanley Dean
Witter Financial Advisor or other Selected Broker-Dealer representative (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
    


                                       31
<PAGE>

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 Morgan Stanley
Dean Witter Financial Advisor or other Selected Broker-Dealer representative,
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 Morgan Stanley Dean Witter Funds in the past.


       For further information regarding the Exchange Privilege, shareholders
should contact their Morgan Stanley Dean Witter Financial Advisor or other
Selected Broker-Dealer representative or the Transfer Agent.
    

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 or the Distributor. 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. If the


                                       32
<PAGE>

   
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 Morgan Stanley Dean Witter Financial Advisor or other Selected
Broker-Dealer representative 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, on sixty days'
notice, to redeem, at net asset value, the shares of any shareholder (other
than shares held in an Individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100, or such lesser amount as may
be fixed by the Board of Trustees or, in the case of an account opened through
EasyInvestSM, if after twelve months the shareholder has invested less than
$1,000 in the account. However, before the Fund redeems such shares and sends
the proceeds to the shareholder, it will notify the shareholder that the value
of the shares is less than the applicable amount and allow him or her sixty
days to make an additional investment in an amount which will increase the
value of his or her account to at least the applicable amount before the
redemption is processed. No CDSC will be imposed on any involuntary redemption.
 

DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------

       Dividends and Distributions. The Fund declares dividends separately for
each Class of shares and intends to pay semi-annual dividends and to distribute
substantially all of the Fund's net investment income and net short-term and
long-term capital gains, if there are any. The Fund intends to distribute
dividends from net long-term capital gains, if any, at least once each year.
The Fund may, however, determine to retain all or part of any long-term capital
gains in any year for reinvestment.

       All dividends and any capital gains distributions will be paid in
additional 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 re-


                                       33
<PAGE>

ceive 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.

       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 will not be taxable to shareholders.


       After the end of the year, shareholders will be sent full information on
their dividends and capital gains distributions for tax purposes. Shareholders
will also be notified of their proportionate share of long-term capital gains
distributions that are eligible for a reduced rate of tax under the Taxpayer
Relief Act of 1997. 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 advisors 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. 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 will 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 500 Stock Index and the Dow Jones Industrial
Average).



                                       34
<PAGE>

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 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 MSDW Advisors, MSDW
Services and MSDW Distributors 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 Morgan Stanley Dean Witter Fund is engaged at the same time in
a purchase or sale of the same security. The Code of Ethics bans the purchase
of securities in an initial public offering, and also prohibits engaging in
futures and options transactions and profiting on short-term trading (that is,
a purchase within sixty days of a sale or a sale within sixty days of a
purchase) of a security. In addition, investment personnel may not purchase or
sell a security for their personal account within thirty days before or after
any transaction in any Morgan Stanley 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.


                                       35
<PAGE>

   
Morgan Stanley Dean Witter                             MORGAN STANLEY
American Value Fund                                    DEAN WITTER
Two World Trade Center                                 AMERICAN
New York, New York 10048                               VALUE FUND
    
TRUSTEES

Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
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

Anita H. Kolleeny
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

Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311

INDEPENDENT ACCOUNTANTS
   
PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036
                                              PROSPECTUS--MAY 1, 1998,
INVESTMENT MANAGER                            AS REVISED AUGUST 21, 1998 
                                           
Morgan Stanley Dean Witter Advisors Inc.
    


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