TCW/DW LATIN AMERICAN GROWTH FUND
497, 1998-04-15
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<PAGE>
   [LOGO]
                      LATIN AMERICAN
                      GROWTH FUND
 
                      PROSPECTUS
                      MARCH 31, 1998
 
TCW/DW Latin American Growth Fund (the "Fund") is an open-end, non-diversified
management investment company, whose investment objective is long-term capital
appreciation. The Fund seeks to achieve its investment objective by investing
primarily in equity securities of Latin American issuers. THE FUND MAY INVEST UP
TO 35% OF ITS TOTAL ASSETS IN HIGH RISK DEBT SECURITIES WHICH ARE UNRATED OR
RATED BELOW INVESTMENT GRADE. INVESTMENTS IN LATIN AMERICA INVOLVE CERTAIN
SPECIAL RISK FACTORS AND THEREFORE MAY NOT BE SUITABLE FOR ALL INVESTORS.
 
The Fund offers four classes of shares (each, a "Class"), each with a different
combination of sales charges, ongoing fees and other features. The different
distribution arrangements permit an investor to choose the method of purchasing
shares that the investor believes is most beneficial given the amount of the
purchase, the length of time the investor expects to hold the shares and other
relevant circumstances. 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 March 31, 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.
 
TABLE OF CONTENTS
Prospectus Summary 2
Summary of Fund Expenses 5
Financial Highlights 6
The Fund and its Management 9
Investment Objective and Policies 9
Risk Considerations 11
Investment Restrictions 16
Purchase of Fund Shares 16
Shareholder Services 24
Repurchases and Redemptions 26
Dividends, Distributions and Taxes 27
Performance Information 28
Additional Information 28
 
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.
 
         TCW/DW LATIN AMERICAN
           GROWTH FUND
         Two World Trade Center
         New York, New York 10048
         (212) 392-2550 or
         (800) 869-NEWS (toll-free)
 
         Dean Witter Distributors Inc.
         Distributor
 
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
     AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
  PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION
                     TO THE CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                   <C>
THE                   The Fund is organized as a trust, commonly known as a Massachusetts business trust,
FUND                  and is an open- end, non-diversified management investment company investing primarily
                      in equity securities of Latin American issuers.
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SHARES                Shares of beneficial interest with $0.01 par value (see page 28). The Fund offers four
OFFERED               Classes of shares, each with a different combination of sales charges, ongoing fees
                      and other features (see pages 16-23). The Fund may in the future suspend the offering
                      of its shares from time to time as may be consistent with prudent portfolio
                      management.
- ---------------------------------------------------------------------------------------------------------
MINIMUM               The minimum initial investment for each Class is $1,000 ($100 if the account is opened
PURCHASE              through EasyInvest-SM-). 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 concurrent investments in Class D shares of the Fund and other multiple
                      class funds for which Dean Witter Services Company Inc. serves as manager and TCW
                      Funds Management, Inc. serves as investment adviser will be aggregated. The minimum
                      subsequent investment is $100 (see page 16).
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INVESTMENT            The investment objective of the Fund is long-term capital appreciation.
OBJECTIVE
- ---------------------------------------------------------------------------------------------------------
MANAGER               Dean Witter Services Company Inc. (the "Manager"), a wholly-owned subsidiary of Dean
                      Witter InterCapital Inc. ("InterCapital"), is the Fund's Manager. The Manager also
                      serves as Manager to ten other TCW/DW Funds. The Manager and InterCapital serve in
                      various investment management, advisory, management and administrative capacities to a
                      total of 101 investment companies and other portfolios with assets of approximately
                      $110 billion at February 28, 1998.
- ---------------------------------------------------------------------------------------------------------
ADVISER               TCW Funds Management, Inc. (the "Adviser") is the Fund's investment adviser. In
                      addition to the Fund, the Adviser serves as investment adviser to ten other TCW/DW
                      Funds. As of February 28, 1998, the Adviser and its affiliates had over $50 billion
                      under management or committed to management in various fiduciary or advisory
                      capacities, primarily from institutional investors.
- ---------------------------------------------------------------------------------------------------------
MANAGEMENT            The Manager receives a monthly fee at the annual rate of 0.75% of daily net assets,
AND ADVISORY          scaled down to 0.72% on assets over $500 million. The Adviser receives a monthly fee
FEES                  at an annual rate of 0.50% of daily net assets, scaled down to 0.48% on assets over
                      $500 million (see page 9).
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DISTRIBUTOR AND       Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a distribution
DISTRIBUTION FEE      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 16 and 23).
</TABLE>
 
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                                       2
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<TABLE>
<S>                   <C>
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ALTERNATIVE           Four classes of shares are offered:
PURCHASE              - Class A shares are offered with a front-end sales charge, starting at 5.25% and
ARRANGEMENTS          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 16, 19 and
                      23).
                      - Class B shares are offered without a front-end sales charge, but will in most cases
                      be subject to a CDSC (scaled down from 5.0% to 1.0%) if redeemed within six years
                      after purchase. The CDSC will be imposed on any redemption of shares if after such
                      redemption the aggregate current value of a Class B account with the Fund falls below
                      the aggregate amount of the investor's purchase payments made during the six years
                      preceding the redemption. A different CDSC schedule applies to investments by certain
                      qualified plans. Class B shares are also subject to a 12b-1 fee assessed at the annual
                      rate of 1.0% of the lesser of: (a) the average daily net sales of the Fund's Class B
                      shares or (b) the average daily net assets of Class B. All shares of the Fund held
                      prior to July 28, 1997 have been designated Class B shares. Shares held before May 1,
                      1997 will convert to Class A shares in May, 2007. In all other instances, Class B
                      shares convert to Class A shares approximately ten years after the date of the
                      original purchase (see pages 16, 20 and 23).
                      - Class C shares are offered without a front-end sales charge, but will in most cases
                      be subject to a CDSC of 1.0% if redeemed within one year after purchase. The Fund is
                      authorized to reimburse the Distributor for specific expenses incurred in promoting
                      the distribution of the Fund's Class C shares and servicing shareholder accounts
                      pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount
                      equal to payments at an annual rate of 1.0% of average daily net assets of the Class
                      (see pages 16, 22 and 23).
                      - 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 16, 22 and 23).
- ---------------------------------------------------------------------------------------------------------
DIVIDENDS             Dividends from net investment income and distributions from net capital gains, if any,
AND CAPITAL           are paid at least once each year. The Fund may, however, determine to retain all or
GAINS                 part of any net long-term capital gains in any year for reinvestment. Dividends and
DISTRIBUTIONS         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 24 and 27).
- ---------------------------------------------------------------------------------------------------------
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
                      EasyInvest-SM-, if after twelve months the shareholder has invested less than $1,000
                      in the account (see page 26).
</TABLE>
 
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                                       3
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<S>                   <C>
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RISK                  The net asset value of the Fund's shares will fluctuate with changes in the market
CONSIDERATIONS        value of the Fund's portfolio securities. It should be recognized that the foreign
                      securities and markets in which the Fund invests pose different and greater risks than
                      those customarily associated with domestic securities and their markets, including (i)
                      the risks generally associated with international investments, such as fluctuations in
                      foreign currency exchange rates, (ii) the risks of investing in countries with
                      smaller, less developed capital markets, such as limited liquidity, price volatility,
                      custodial settlement issues and restrictions on foreign investment, and (iii) the
                      risks associated with Latin American economies, including high levels of inflation,
                      large amounts of debt and political and social uncertainties, such as the risk of
                      expropriation, nationalization or confiscation of the Fund's assets or the imposition
                      of restrictions on foreign investment or the repatriation of capital invested. In
                      addition, Latin American securities markets are subject to non-uniform corporate
                      disclosure standards and governmental regulation which may lead to less publicly
                      available and less reliable information concerning Latin American issuers than is
                      generally the case for U.S. issuers (see page 11). The Fund may invest in securities
                      issued by foreign investment companies, which may result in additional costs to the
                      Fund. The Fund is a non-diversified investment company and, as such, is not subject to
                      the diversification requirements of the Investment Company Act of 1940. As a result, a
                      relatively high percentage of the Fund's assets may be invested in a limited number of
                      issuers. However, the Fund intends to continue to qualify as a regulated investment
                      company under the federal income tax laws and, as such, is subject to the
                      diversification requirements of the Internal Revenue Code (see page 14). The Fund may
                      invest in lower rated or unrated sovereign debt of Latin American countries or debt
                      securities of Latin American issuers, which involves a high degree of risk (see page
                      11). The Fund also may engage in options and futures transactions and may purchase
                      securities on a when-issued, delayed delivery or "when, as and if issued" basis, which
                      may involve certain additional risks (see pages 13-15).
</TABLE>
 
- --------------------------------------------------------------------------------
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
              ELSEWHERE IN THIS PROSPECTUS AND IN THE STATEMENT OF
                            ADDITIONAL INFORMATION.
 
                                       4
<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
expenses and fees for the fiscal year ended January 31, 1998.
 
<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 and Advisory Fees....................................................   1.25%       1.25%     1.25%       1.25%
12b-1 Fees (5) (6)..............................................................   0.25%       1.00%     1.00%       None
Other Expenses..................................................................   0.56%       0.56%     0.56%       0.56%
Total Fund Operating Expenses (7)...............................................   2.06%       2.81%     2.81%       1.81%
</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."
 
<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...............................................................   $      72    $     114    $     158    $     279
    Class B...............................................................   $      78    $     117    $     169    $     314
    Class C...............................................................   $      38    $      87    $     148    $     314
    Class D...............................................................   $      18    $      57    $      98    $     213
 
You would pay the following expenses on the same $1,000 investment
 assuming no redemption at the end of the period:
    Class A...............................................................   $      72    $     114    $     158    $     279
    Class B...............................................................   $      28    $      87    $     149    $     314
    Class C...............................................................   $      28    $      87    $     148    $     314
    Class D...............................................................   $      18    $      57    $      98    $     213
</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 "Repurchases and Redemptions."
 
    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
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    The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by Price Waterhouse LLP,
independent accountants. The financial highlights should be read in conjunction
with the financial statements, notes thereto, and the unqualified report of
independent accountants which are contained in the Statement of Additional
Information. Further information about the performance of the Fund is contained
in the Fund's Annual Report to Shareholders, which may be obtained without
charge upon request to the Fund.
 
<TABLE>
<CAPTION>
                                                                                                 FOR THE PERIOD
                                                                                                  DECEMBER 30,
                                                                                                     1992*
                                                FOR THE YEAR ENDED JANUARY 31,                      THROUGH
                                --------------------------------------------------------------    JANUARY 31,
CLASS B SHARES                   1998**++       1997         1996         1995         1994          1993++
                                ----------   ----------   ----------   ----------   ----------   --------------
<S>                             <C>          <C>          <C>          <C>          <C>          <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, beginning of
 period.......................   $   11.47    $    9.48    $    9.35    $   16.05    $    9.56        $  10.00
                                ----------   ----------   ----------   ----------   ----------          ------
Net investment loss...........       (0.09)       (0.04)       (0.06)       (0.17)       (0.04)          (0.01)
Net realized and unrealized
 gain (loss)..................        0.71         2.03         0.19        (6.21)        6.68           (0.43)
                                ----------   ----------   ----------   ----------   ----------          ------
Total from investment
 operations...................        0.62         1.99         0.13        (6.38)        6.64           (0.44)
                                ----------   ----------   ----------   ----------   ----------          ------
Less distributions from net
 realized gain................          --           --           --        (0.32)       (0.15)             --
                                ----------   ----------   ----------   ----------   ----------          ------
Net asset value, end of
 period.......................   $   12.09    $   11.47    $    9.48    $    9.35    $   16.05        $   9.56
                                ----------   ----------   ----------   ----------   ----------          ------
                                ----------   ----------   ----------   ----------   ----------          ------
TOTAL INVESTMENT RETURN+......       5.41%       20.99%        1.39%     (40.12)%       69.49%         (4.30)%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses......................       2.81%        2.78%        2.98%        2.87%        2.89%           3.08%(2)
Net investment loss...........     (0.64)%      (0.29)%      (0.61)%      (1.46)%      (0.90)%         (1.08)%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in
 thousands....................    $272,710     $270,843     $261,066     $294,774     $325,956         $69,611
Portfolio turnover rate.......         30%          29%          64%         145%         111%              1%(1)
Average commission rate
 paid.........................     $0.0006      $0.0002           --           --           --              --
</TABLE>
 
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 *  COMMENCEMENT OF OPERATIONS.
**  PRIOR TO JULY 28, 1997, THE FUND ISSUED ONE CLASS OF SHARES. ALL SHARES OF
    THE FUND HELD PRIOR TO THAT DATE HAVE BEEN DESIGNATED CLASS B 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.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
                                       6
<PAGE>
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<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          JANUARY 31,
                                                                             1998++
                                                                        ----------------
<S>                                                                     <C>
CLASS A SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 15.22
                                                                             ------
Net investment loss...................................................        (0.07)
Net realized and unrealized loss......................................        (3.01)
                                                                             ------
Total from investment operations......................................        (3.08)
                                                                             ------
Net asset value, end of period........................................      $ 12.14
                                                                             ------
                                                                             ------
 
TOTAL INVESTMENT RETURN+..............................................       (20.24)%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         2.15% (2)
Net investment loss...................................................        (1.04)%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................         $110
Portfolio turnover rate...............................................           30%
Average commission rate paid..........................................      $0.0006
 
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 15.22
                                                                             ------
Net investment loss...................................................        (0.12)
Net realized and unrealized loss......................................        (3.00)
                                                                             ------
Total from investment operations......................................        (3.12)
                                                                             ------
Net asset value, end of period........................................      $ 12.10
                                                                             ------
                                                                             ------
 
TOTAL INVESTMENT RETURN+..............................................       (20.50)%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         2.91% (2)
Net investment loss...................................................        (1.76)%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................         $792
Portfolio turnover rate...............................................           30%
Average commission rate paid..........................................      $0.0006
</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>
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<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          JANUARY 31,
                                                                             1998++
                                                                        ----------------
<S>                                                                     <C>
CLASS D SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 15.22
                                                                             ------
Net investment loss...................................................        (0.04)
Net realized and unrealized loss......................................        (3.02)
                                                                             ------
Total from investment operations......................................        (3.06)
                                                                             ------
Net asset value, end of period........................................      $ 12.16
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................       (20.11)%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         1.86% (2)
Net investment loss...................................................        (0.52)%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...............................           $8
Portfolio turnover rate...............................................           30%
Average commission rate paid..........................................      $0.0006
</TABLE>
 
- ------------
 *  THE DATE SHARES WERE FIRST ISSUED.
++  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
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TCW/DW Latin American Growth Fund (the "Fund") is an open-end, non-diversified
management investment company. The Fund is a trust of the type commonly known as
a "Massachusetts business trust" and was organized under the laws of
Massachusetts on February 25, 1992.
 
    Dean Witter Services Company Inc. (the "Manager"), whose address is Two
World Trade Center, New York, New York 10048, is the Fund's Manager. The Manager
is a wholly-owned subsidiary of Dean Witter InterCapital Inc. ("InterCapital").
InterCapital 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 Manager acts as manager to ten other TCW/DW Funds. The Manager and
InterCapital serve in various investment management, advisory, management and
administrative capacities to a total of 101 investment companies, 28 of which
are listed on the New York Stock Exchange, with combined assets of approximately
$106 billion as of February 28, 1998. InterCapital also manages and advises
portfolios of pension plans, other institutions and individuals which aggregated
approximately $4 billion at such date.
 
    The Fund has retained the Manager to manage its business affairs, supervise
its overall day-to-day operations (other than providing investment advice) and
provide all administrative services.
 
    TCW Funds Management, Inc. (the "Adviser"), whose address is 865 South
Figueroa Street, Suite 1800, Los Angeles, California 90017, is the Fund's
investment adviser. The Adviser was organized in 1987 as a wholly-owned
subsidiary of The TCW Group, Inc. ("TCW"), whose subsidiaries, including Trust
Company of the West and TCW Asset Management Company, provide a variety of
trust, investment management and investment advisory services. Robert A. Day,
who is Chairman of the Board of Directors of TCW, may be deemed to be a control
person of the Adviser by virtue of the aggregate ownership by Mr. Day and his
family of more than 25% of the outstanding voting stock of TCW. The Adviser
serves as investment adviser to ten other TCW/DW Funds in addition to the Fund.
As of February 28, 1998, the Adviser and its affiliated companies had over $50
billion under management or committed to management, primarily from
institutional investors.
 
    The Fund has retained the Adviser to invest the Fund's assets.
 
    The Fund's Trustees review the various services provided by the Manager and
the Adviser to ensure that the Fund's general investment policies and programs
are being properly carried out and that administrative services are being
provided to the Fund in a satisfactory manner.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Manager, the Fund pays the Manager
monthly compensation calculated daily by applying the annual rate of 0.75% to
the Fund's net assets up to $500 million, scaled down to 0.72% on assets over
$500 million. As compensation for its investment advisory services, the Fund
pays the Adviser monthly compensation calculated daily by applying an annual
rate of 0.50% to the Fund's net assets up to $500 million, scaled down to 0.48%
on assets over $500 million. For the fiscal year ended January 31, 1998, the
Fund accrued total compensation to the Manager and the Adviser amounting to
0.75% and 0.50%, respectively, of the Fund's average daily net assets. During
that period, the total expenses of Class B amounted to 2.81% of the 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
Manager and the Adviser; 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 Manager and the Adviser under
their respective Agreements with the Fund.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is long-term capital appreciation. This
objective is fundamental and may not be changed without shareholder approval.
There is no assurance that the objective will be achieved.
 
    The Fund seeks to achieve its objective by investing under normal
circumstances at least 65% of its total assets in equity securities of Latin
American issuers (as described below). Securities will be selected on the basis
of their potential for capital appreciation based on an evaluation of their
prospects for earnings growth; current dividend income will not be a factor. The
Fund may also invest up to 35% of its total assets under normal circumstances in
Latin American convertible securities, Latin American debt securities (as
described below) of governmental and corporate issuers, denominated in U.S.
dollars or in local currencies, including debt obligations issued or guaranteed
by Latin American governmental entities.
 
    In its investment strategy, the Adviser primarily adopts a top-down
approach, beginning with an evaluation of the country in which the proposed
investment is to be made, including relevant external developments and their
implications. Following the country level of review, investments in
 
                                       9
<PAGE>
specific securities will be made after completion of a fundamental analysis of
securities, industries and companies by the Adviser, including consideration of
liquidity, market capitalization, a company's existing and expected future
financial position, relative competitive position in the domestic and export
markets, technology, recent developments and profitability, together with
overall growth prospects. Other considerations include management expertise,
government regulation and costs of labor and raw materials.
 
    For purposes of this Prospectus, equity securities of Latin American issuers
are defined as follows: (a) equity securities of companies organized in a
country in Latin America or for which the principal trading market (the exchange
or over-the-counter market in which the largest portion of the shares of the
company's securities is traded) is located in Latin America, (b) equity
securities of companies that derive at least 50% of their revenues from either
goods produced or services performed in Latin America or sales made in Latin
America, and (c) equity securities in the form of depositary shares listed on
securities exchanges or traded in other regulated markets in the United States.
In addition, the Fund may invest up to 35% of its total assets in debt
securities of Latin American issuers, which consist of: (a) debt securities of
companies organized in a country in Latin America or for which the principal
trading market is located in Latin America, (b) debt securities issued or
guaranteed by the government of a country in Latin America, its agencies or
instrumentalities, or the central bank of such country ("Sovereign Debt"), (c)
debt securities denominated in a Latin American currency issued by companies to
finance operations in Latin America and (d) debt securities of companies that
derive at least 50% of their revenues from either goods produced or services
performed in Latin America or sales made in Latin America. The Fund may consider
investment companies to be located in the country or countries in which they
primarily make their portfolio investments.
 
    The Fund defines Latin America to consist of the following countries:
Argentina, the Bahamas, Barbados, Belize, Bolivia, Brazil, Chile, Colombia,
Costa Rica, Dominican Republic, Ecuador, El Salvador, French Guinea, Guatemala,
Guyana, Haiti, Honduras, Jamaica, Mexico, the Netherlands Antilles, Nicaragua,
Panama, Paraguay, Peru, Suriname, Trinidad and Tobago, Uruguay and Venezuela.
 
    The Fund's assets will be allocated among the countries in Latin America in
accordance with the Adviser's judgment as to where the best investment
opportunities exist. Currently, except when the Fund has adopted a defensive
position, it will invest its assets among at least three Latin American
countries at all times.
 
    The Fund intends its portfolio of Latin American securities to consist
primarily of equity securities. Latin American equity securities in which the
Fund invests consist predominantly of common stock and preferred stock of
established companies listed on a recognized securities exchange or traded in
other regulated markets, although the Fund may also invest to a limited extent
in convertible securities, warrants and stock rights. For a discussion of the
risks of such securities, see "Risk Considerations" below.
 
    The Fund may invest in securities of Latin American issuers in the form of
American Depository Receipts ("ADRs") or other similar securities, such as
American Depository Shares and Global Depository Shares, convertible into
securities of foreign issuers. These securities may not necessarily be
denominated in the same currency as the securities into which they may be
converted. ADRs are receipts typically issued by a United States bank or trust
company evidencing ownership of the underlying securities. Generally, ADRs, in
registered form, are designed for use in United States securities markets. As a
result of the absence of established securities markets and publicly-owned
corporations in certain Latin American countries, as well as restrictions on
direct investment by foreign entities, the Fund may be able to invest in such
countries solely or primarily through ADRs or similar securities and government
approved investment vehicles. For example, due to Chile's current investment
restrictions (in most cases capital invested directly in Chile cannot be
repatriated for at least one year), the Fund's investments in Chile primarily
will be through investment in ADRs and established Chilean investment companies
not subject to repatriation restrictions.
 
    The governments of some Latin American countries, to varying degrees, have
been engaged in programs of selling part or all of their stakes in
government-owned or government-controlled enterprises ("privatizations"). The
Adviser believes that privatizations may offer investors opportunities for
significant capital appreciation and invests assets of the Fund in
privatizations in appropriate circumstances. In certain Latin American
countries, the ability of foreign persons, such as the Fund, to participate in
privatizations may be limited by local law, or the terms on which the Fund may
be permitted to participate may be less advantageous than those for local
investors. There can be no assurance that privatization programs will continue
or be successful.
 
    INVESTMENTS IN DEBT AND CONVERTIBLE SECURITIES.  As stated above, the Fund
may invest up to 35% of its total assets in Latin American convertible
securities and debt securities of governmental and corporate issuers,
denominated in U.S. dollars or local currencies. The Fund may seek capital
appreciation through investment in debt securities, such as may occur through
favorable changes in relative foreign exchange rates, in relative interest rate
levels or in creditworthiness of issuers. The Fund may also invest in debt
securities on a limited basis in order to participate in debt-to-equity
conversion programs sponsored by certain Latin American countries, or in order
to participate in corporate reorganizations. Latin American debt securities that
the Fund may acquire include bonds, notes and debentures of any maturity of
Latin American governments, obligations of such governments' agencies,
instrumentalities and central banks and of banks and other companies of Latin
American countries, determined by the Adviser to be suitable investments for the
Fund.
 
                                       10
<PAGE>
In addition to the specific risks regarding Latin American securities and lower
rated debt securities described below, in general the value of debt securities
tends to increase during periods of declining interest rates and decrease during
periods of rising interest rates.
 
    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).
 
    There is no limitation other than the overall 35% limitation described above
on the percentage of the Fund's total assets which may be invested in
convertible securities and debt securities below investment grade. Most debt
securities in which the Fund invests are not rated; when rated, such ratings
will generally be below investment grade. Securities below investment grade are
the equivalent of high yield, high risk bonds, commonly known as "junk bonds."
Investment grade is generally considered to be debt securities rated BBB or
higher by Standard & Poor's Corporation ("S&P") or Baa or higher by Moody's
Investors Service, Inc. ("Moody's"). However, the Fund will not invest in debt
securities that are in default in payment of principal or interest. A
description of fixed-income securities ratings is contained in the Appendix to
the Statement of Additional Information. For a discussion of the risks of
convertible and lower rated debt securities, see "Risk Considerations" below.
 
    Certain Latin American countries are among the largest debtors to commercial
banks and foreign governments. Trading in Sovereign Debt involves a high degree
of risk, since the governmental entity that controls the repayment of Sovereign
Debt may not be willing or able to repay the principal and/or interest of such
debt obligations when it becomes due, due to factors such as debt service
burden, political constraints, cash flow situation and other national economic
factors. As a result, Latin American governments may default on their Sovereign
Debt, which may require holders of such Sovereign Debt to participate in debt
rescheduling or additional lending to defaulting governments. There is no
bankruptcy proceeding by which defaulted Sovereign Debt may be collected in
whole or in part.
 
    The Fund may invest in a particular type of Latin American debt security
known as "Brady Bonds," which were issued under the "Brady Plan" in exchange for
loans and cash in connection with restructurings in various Latin American
external debt markets in 1990. Brady Bonds are issued in various currencies,
primarily the U.S. dollar, and are actively traded in the over-the-counter
secondary market for Latin American debt. In the case of U.S. dollar denominated
collateralized Brady Bonds, the bonds are collateralized in full as to principal
by U.S. Treasury zero coupon bonds of the same maturity. In addition, at least
one year of rolling interest payments are collateralized by cash or other
investments.
 
    The Adviser attempts to minimize the speculative risks associated with
investments in lower rated securities through credit analysis, and by carefully
monitoring current trends in interest rates, political developments and other
factors. Nonetheless, investors should carefully review the investment objective
and policies of the Fund and consider their ability to assume the investment
risks involved before making an investment.
 
    INVESTMENT IN OTHER INVESTMENT VEHICLES.  Under the Investment Company Act
of 1940, as amended (the "Investment Company Act"), the Fund generally may
invest up to 10% of its total assets in the aggregate in shares of other
investment companies and up to 5% of its total assets in any one investment
company. The Fund may not own more than 3% of the outstanding voting stock of
any investment company. As stated above, investment in other investment
companies or vehicles may be the sole or most practical means by which the Fund
can participate in certain Latin American securities markets. Such investment
may involve the payment of substantial premiums above the value of such issuers'
portfolio securities, and is subject to the limitations described above and
market availability. There can be no assurance that vehicles or funds for
investing in certain Latin American countries will be available for investment.
In addition, special tax considerations may apply. The Fund does not intend to
invest in such vehicles or funds unless, in the judgment of the Adviser, the
potential benefits of such investment justify the payment of any applicable
premium or sales charge. As a shareholder in an investment company, the Fund
would bear its ratable share of that investment company's expenses, including
its advisory and administration fees. At the same time the Fund would continue
to pay its own management and advisory fees and other expenses, as a result of
which the Fund and its shareholders in effect will be absorbing duplicate levels
of advisory fees with respect to investments in such other investment companies.
 
RISK CONSIDERATIONS
 
The net asset value of the Fund's shares will fluctuate with changes in the
market value of the Fund's securities. The market value of the Fund's portfolio
securities will increase or decrease due to a variety of economic, market and
political factors which cannot be predicted.
 
    FOREIGN SECURITIES.  Investors should carefully consider the risks of
investing in securities of foreign issuers and securities denominated in
non-U.S. currencies. Fluctuations in the relative rates of exchange between the
currencies of different nations will affect the value of the Fund's investments.
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
 
                                       11
<PAGE>
upon the Fund's total return on such assets. See the Statement of Additional
Information for a discussion of additional risk factors.
 
    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.
 
    In addition, many of the currencies of Latin American countries have
experienced steady devaluations relative to the U.S. dollar, and major
devaluations have historically occurred in certain countries. Any devaluations
in the currencies in which the Fund's portfolio securities are denominated may
have a detrimental impact on the Fund.
 
    Some Latin American countries also may have managed currencies which are not
free floating against the U.S. dollar. In addition, there is a risk that certain
Latin American countries may restrict the free conversion of their currencies
into other currencies. Further, certain Latin American currencies may not be
internationally traded.
 
    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. Political and economic developments in Latin America may have
profound effects upon the value of the Fund's portfolio. In the event of
expropriation, nationalization or other complication, the Fund could lose its
entire investment in any one country. In addition, individual Latin American
countries may place restrictions on the ability of foreign entities such as the
Fund to invest in particular segments of the local economies.
 
    Latin American 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, Latin American companies are not subject to
uniform accounting, auditing and financial reporting standards and requirements
comparable to those applicable to U.S. companies. Also, certain Latin American
countries may impose unusually high withholding taxes on dividends payable to
the Fund, thereby effectively reducing the Fund's investment income.
 
    The securities markets of Latin American countries are substantially
smaller, less developed, less liquid and more volatile than the major securities
markets in the United States. The limited size of many Latin American securities
markets and limited trading volume in issuers compared to volume of trading in
U.S. securities could cause prices to be erratic for reasons apart from factors
that affect the quality of the securities. For example, limited market size may
cause prices to be unduly influenced by traders who control large positions.
Adverse publicity and investors' perceptions, whether or not based on
fundamental analysis, may decrease the value and liquidity of portfolio
securities, especially in these markets.
 
    In addition, Latin American exchanges and broker-dealers are generally
subject to less government and exchange scrutiny and regulation than their
American counterparts. Brokerage commissions, dealer concessions, custodial
expenses and other transaction costs may be higher in foreign markets than in
the U.S. Thus, the Fund's operating expenses are expected to be higher than
those of investment companies investing primarily in domestic or other more
established market regions. Also, differences in clearance and settlement
procedures on foreign markets may occasion delays in settlements of Fund trades
effected in such markets. 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. In addition, certain adverse
tax consequences of the Fund's investments in passive foreign investment
companies are discussed below under "Dividends, Distributions and Taxes."
 
    Certain Latin American countries are among the largest debtors to commercial
banks and foreign governments. At times certain Latin American countries have
declared moratoria on the payment of principal and/or interest on external debt.
 
    Most Latin American countries have experienced substantial, and in some
periods extremely high, rates of inflation for many years. Inflation and rapid
fluctuations in inflation rates have had and may continue to have very negative
effects on the economies and securities markets of certain Latin American
countries.
 
    The Fund may not invest more than 15% of its net assets in illiquid
securities. The Fund will treat any Latin American securities that are subject
to restrictions on repatriation for more than seven days, as well as any
securities issued in connection with Latin American debt conversion programs
that are restricted as to remittance of invested capital or profits, as illiquid
securities for purposes of this limitation. The Fund will also treat repurchase
agreements with maturities in excess of seven days as being illiquid for this
purpose.
 
DEBT SECURITIES
 
Because of the special nature of the Fund's permitted investments in lower rated
convertible and debt securities, the Adviser must take account of certain
special considerations in assessing the risks associated with such investments.
The prices of lower rated securities have been found to be less sensitive to
changes in prevailing interest rates than higher rated investments, but are
likely to be more sensitive to
 
                                       12
<PAGE>
adverse economic changes or individual corporate developments. During an
economic downturn or substantial period of rising interest rates, highly
leveraged issuers may experience financial stress which would adversely affect
their ability to service their principal and interest payment obligations, to
meet their projected business goals or to obtain additional financing. If the
issuer of a fixed-income security owned by the Fund defaults, the Fund may incur
additional expenses to seek recovery. In addition, periods of economic
uncertainty and change can be expected to result in an increased volatility of
market prices of lower rated securities and a corresponding volatility in the
net asset value of a share of the Fund.
 
    The risks of other investment techniques which may be utilized by the Fund
are described under "Forward Foreign Currency Exchange Contracts," "Options and
Futures Transactions" and "Other Investment Policies" below.
 
FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS
 
To hedge against adverse price movements in the securities held in its portfolio
and the currencies in which they are denominated (as well as in the securities
it might wish to purchase and their denominated currencies) the Fund may engage
in transactions in forward foreign currency contracts.
 
    A forward foreign currency exchange contract ("forward contract") involves
an obligation to purchase or sell a currency at a future date, which may be any
fixed number of days from the date of the contract agreed upon by the parties,
at a price set at the time of the contract. The Fund may enter into forward
contracts as a hedge against fluctuations in future foreign exchange rates.
 
    Currently, only a limited market, if any, exists for hedging transactions
relating to currencies in most Latin American markets or to securities of
issuers domiciled or principally engaged in business in Latin American markets.
This may limit the Fund's ability to effectively hedge its investments in Latin
American markets. Hedging against a decline in the value of a currency does not
eliminate fluctuations in the prices of portfolio securities or prevent losses
if the prices of such securities decline. Such transactions also limit the
opportunity for gain if the value of the hedged currencies should rise. In
addition, it may not be possible for the Fund to hedge against a devaluation
that is so generally anticipated that the Fund is not able to contract to sell
the currency at a price above the devaluation level it anticipates.
 
    If the Fund enters into forward contract transactions and the currency in
which the Fund's portfolio securities (or anticipated portfolio securities) are
denominated rises in value with respect to the currency which is being purchased
(or sold), then the Fund will have realized fewer gains than had the Fund not
entered into the forward contracts. Moreover, the precise matching of the
forward contract amounts and the value of the securities involved will not
generally be possible, since the future value of such securities in foreign
currencies will change as a consequence of market movements in the value of
those securities between the date the forward contract is entered into and the
date it matures. The Fund is not required to enter into such transactions with
regard to its foreign currency-denominated securities and will not do so unless
deemed appropriate by the Adviser.
 
OPTIONS AND FUTURES TRANSACTIONS
 
The Fund may purchase and sell (write) call and put options on portfolio
securities which are denominated in either U.S. dollars or Latin American
currencies and on the U.S. dollar and foreign currencies, which are or may in
the future be listed on several U.S. and foreign securities exchanges or are
written in over-the-counter transactions ("OTC options"). OTC options are
purchased from or sold (written) to dealers or financial institutions which have
entered into direct agreements with the Fund.
 
    The Fund is permitted to write covered call options on portfolio securities
and the U.S. dollar and Latin American currencies, without limit, in order to
hedge against the decline in the value of a security or currency in which such
security is denominated and to close out long call option positions. The Fund
may write covered put options, under which the Fund incurs an obligation to buy
the security (or currency) underlying the option from the purchaser of the put
at the option's exercise price at any time during the option period, at the
purchaser's election. The aggregate value of the obligation underlying the puts
determined as of the date the options are sold will not exceed 50% of the Fund's
net assets.
 
    The Fund may purchase listed and OTC call and put options in amounts
equalling up to 5% of its total assets. The Fund may purchase call options to
close out a covered call position or to protect against an increase in the price
of a security it anticipates purchasing or, in the case of call options on a
foreign currency, to hedge against an adverse exchange rate change of the
currency in which the security it anticipates purchasing is denominated
vis-a-vis the currency in which the exercise price is denominated. The Fund may
purchase put options on securities which it holds in its portfolio 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.
 
    The Fund may purchase and sell futures contracts that are currently traded,
or may in the future be traded, on U.S. and foreign commodity exchanges on
underlying portfolio securities, on any of the Latin American currencies
("currency" futures), on U.S. and Latin American fixed-income securities
("interest rate" futures) and on such indexes of U.S. or Latin American equity
or fixed-income securities as may exist or come into being ("index" futures).
The Fund may purchase or sell interest rate futures contracts for the purpose of
hedging some or all of the value of its portfolio securities (or anticipated
portfolio securities) against changes in prevailing interest rates. The Fund may
purchase or sell index futures contracts for the purpose of hedging some or all
of its portfolio (or anticipated portfolio) securities against changes
 
                                       13
<PAGE>
in their prices (or the currency in which they are denominated.) As stated
above, currently only a limited market exists for options and futures
transactions relating to Latin America currencies or issuers. As a futures
contract purchaser, the Fund incurs an obligation to take delivery of a
specified amount of the obligation underlying the contract at a specified time
in the future for a specified price. As a seller of a futures contract, the Fund
incurs an obligation to deliver the specified amount of the underlying
obligation at a specified time in return for an agreed upon price.
 
    The Fund also may purchase and write call and put options on futures
contracts which are traded on an exchange and enter into closing transactions
with respect to such options to terminate an existing position.
 
    New futures contracts, options and other financial products and various
combinations thereof continue to be developed. The Fund may invest in any such
futures, options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
    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, particularly
in the case of OTC options, as such options may generally only be closed out by
entering into a closing purchase transaction with the purchasing dealer. Also,
exchanges may limit the amount by which the price of many futures contracts may
move on any day. If the price moves equal to the daily limit on successive days,
then it may prove impossible to liquidate a futures position until the daily
limit moves have ceased.
 
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk is that the Adviser could be incorrect in its expectations as to
the direction or extent of various interest rate or price movements or the time
span within which the movements take place. For example, if the Fund sold
futures contracts for the sale of securities in anticipation of an increase in
interest rates, and then interest rates went down instead, causing bond prices
to rise, the Fund would lose money on the sale. Another risk which will arise in
employing futures contracts to protect against the price volatility of portfolio
securities is that the prices of securities, currencies and indexes subject to
futures contracts (and thereby the futures contract prices) may correlate
imperfectly with the behavior of the U.S. dollar cash prices of the Fund's
portfolio securities and their denominated currencies. See the Statement of
Additional Information for a further discussion of risks.
 
OTHER INVESTMENT POLICIES
 
While the Fund will invest primarily in equity securities of Latin American
issuers, under ordinary circumstances it may invest up to 35% of its total
assets in (i) debt securities of Latin American issuers, as described above, and
(ii) U.S. money market instruments, which are short-term (maturities of up to
thirteen months) fixed-income securities issued by private and governmental
institutions. Money market instruments in which the Fund may invest are
securities issued or guaranteed by the U.S. Government or its agencies (Treasury
bills, notes and bonds); obligations of banks subject to regulation by the U.S.
Government and having total assets of $1 billion or more; Eurodollar
certificates of deposit; obligations of savings banks and savings and loan
associations having total assets of $1 billion or more; fully insured
certificates of deposit; and commercial paper rated within the two highest
grades by Moody's or S&P or, if not rated, issued by a company having an
outstanding debt issue rated AAA by S&P or Aaa by Moody's.
 
    There may be periods during which, in the opinion of the Adviser, market
conditions warrant reduction of some or all of the Fund's securities holdings.
During such periods, the Fund may adopt a temporary "defensive" posture in which
greater than 35% of its total assets is invested in money market instruments or
cash.
 
    The Fund is classified as a non-diversified investment company under the
Investment Company Act, and as such is not limited by the Investment Company Act
in the proportion of its assets that it may invest in the obligations of a
single issuer. However, the Fund intends to conduct its operations so as to
qualify as a "regulated investment company" under Subchapter M of the Internal
Revenue Code. See "Dividends, Distributions and Taxes." In order to qualify,
among other requirements, the Fund will limit its investments so that at the
close of each quarter of the taxable year, (i) not more than 25% of the market
value of the Fund's total assets will be invested in the securities of a single
issuer, and (ii) with respect to 50% of the market value of its total assets not
more than 5% will be invested in the securities of a single issuer and the Fund
will not own more than 10% of the outstanding voting securities of a single
issuer. To the extent that a relatively high percentage of the Fund's assets may
be invested in the obligations of a limited number of issuers, the Fund's
portfolio securities may be more susceptible to any single economic, political
or regulatory occurrence than the portfolio securities of a diversified
investment company. The limitations described in this paragraph are not
fundamental policies and may be revised to the extent applicable Federal income
tax requirements are revised.
 
    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
 
                                       14
<PAGE>
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 and maintaining
adequate collateralization.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time, in the ordinary course of business, the Fund may purchase
securities on a when-issued or delayed delivery basis or may purchase or sell
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 its net asset value.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased
by the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
    PRIVATE PLACEMENTS.  The Fund may invest up to 5% of its total assets in
securities which are subject to restrictions on resale because they have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), or which are otherwise not readily marketable. (Securities eligible for
resale pursuant to Rule 144A under the Securities Act, and determined to be
liquid pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.) These securities are generally referred
to as private placements or restricted securities. Limitations on the resale of
such securities may have an adverse effect on their marketability, and may
prevent the Fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of registering such securities for resale and the
risk of substantial delays in effecting such registration.
 
    Rule 144A under the Securities Act permits the Fund to sell restricted
securities to qualified institutional buyers without limitation. The Adviser,
pursuant to procedures adopted by the Trustees of the Fund, will make a
determination as to the liquidity of each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid," such security will
not be included within the category "illiquid securities," which under 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.
 
    YEAR 2000.  The management services provided to the Fund by the Manager, the
investment advisory services provided to the Fund by the Adviser 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 Manager, the Adviser, 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
 
                                       15
<PAGE>
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 Adviser with a view to achieving
the Fund's investment objective. Michael P. Reilly, Managing Director of the
Adviser, is the primary portfolio manager of the Fund. Mr. Reilly has been a
primary portfolio manager of the Fund since December, 1994, and has been a
portfolio manager with affiliates of TCW for over five years.
 
    In determining which securities to purchase for the Fund or hold in the
Fund's portfolio, the Adviser will rely on information from various sources,
including research, analysis and appraisals of brokers and dealers, including
Dean Witter Reynolds Inc. ("DWR") Morgan Stanley & Co. Incorporated, and other
brokers and dealers that are affiliates of the Manager, and others regarding
economic developments and interest rate trends, and the Adviser's own analysis
of factors it deems relevant.
 
    Orders for transactions in portfolio securities and commodities are placed
for the Fund with a number of brokers and dealers, including DWR, Morgan Stanley
& Co. Incorporated and other brokers and dealers that are affiliates of the
Manager. The Fund may incur brokerage commissions on transactions conducted
through DWR, Morgan Stanley & Co. Incorporated and other brokers and dealers
that are affiliates of the Manager. Under normal circumstances it is not
anticipated that the portfolio trading will result in the Fund's portfolio
turnover rate exceeding 150% in any one year. The Fund will incur brokerage
costs commensurate with its portfolio turnover rate and thus a higher level
(over 100%) of portfolio transactions will increase the Fund's overall brokerage
expenses. See "Dividends, Distributions and Taxes" for a discussion of the tax
implications of the Fund's trading policy.
 
    Except as specifically noted, all investment policies and practices
discussed above are not fundamental policies of the Fund and, as such, may be
changed without shareholder approval.
 
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, 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 Investment
Company 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 25% or more of the value of its total assets in securities of
    issuers in any one industry. This restriction does not apply to obligations
    issued or guaranteed by the United States Government, its agencies or
    instrumentalities.
 
        2.  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 does not apply to
    obligations issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
    In addition, as a non-fundamental policy, the Fund may not, as to 75% of its
total assets, purchase more than 10% of the voting securities of any issuer.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
The Fund offers each class of its shares for sale to the public on a continuous
basis. Shares of the Fund are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Manager. Shares of the Fund are distributed
by the Distributor and offered by DWR and other dealers (which may include TCW
Brokerage Services, an affiliate of the Adviser) who have entered into selected
dealer agreements with the Distributor ("Selected Broker-Dealers"). The
principal executive office of the Distributor is located at Two World Trade
Center, New York, New York 10048.
 
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge that declines to zero for larger
purchases; however, Class A
 
                                       16
<PAGE>
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 and concurrent investments in Class D shares of the Fund and other
TCW/DW Funds which are multiple class funds ("TCW/DW Multi-Class Funds") will be
aggregated. Subsequent purchases of $100 or more may be made by sending a check,
payable to TCW/DW Latin American Growth Fund, directly to Morgan Stanley Dean
Witter Trust FSB (the "Transfer Agent" or "MSDW Trust") at P.O. Box 1040, Jersey
City, NJ 07303, by contacting an account executive of DWR or other Selected
Broker-Dealer. When purchasing shares of the Fund, investors must specify
whether the purchase is for Class A, Class B, Class C or Class D shares. If no
Class is specified, the Transfer Agent will not process the transaction until
the proper Class is identified. The minimum initial purchase, in the case of
investments through EasyInvest, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling at least $1,000 within the first twelve months.
The minimum initial investment 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 InterCapital 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 a
request is made by the shareholder in writing to the Transfer Agent.
 
    Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit from the temporary use of the funds if payment is made prior
thereto. As noted above, orders placed directly with the Transfer Agent must be
accompanied by payment. Investors will be entitled to receive income dividends
and capital gains distributions if their order is received by the close of
business on the day prior to the record date for such dividends and
distributions. Sales personnel of a Selected Broker-Dealer are compensated for
selling shares of the Fund by the Distributor or any of its affiliates and/or
the Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer will receive various types of non-cash compensation as special
sales incentives, including trips, educational and/or business seminars and
merchandise. The Fund and the Distributor reserve the right to reject any
purchase orders.
 
    The Fund in the future may suspend the offering of its shares from time to
time as may be consistent with prudent portfolio management. Automatic
reinvestment of dividends and distributions will not be affected by any
suspension by the Fund of offering its shares.
 
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
 
                                       17
<PAGE>
expense of the additional incremental distribution costs resulting from the CDSC
applicable to shares of those Classes. The ongoing distribution fees that are
imposed on Class A, Class B and Class C shares will be imposed directly against
those Classes and not against all assets of the Fund and, accordingly, such
charges against 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 "Repurchase and Redemption."
 
    Set forth below is a summary of the differences between the Classes and the
factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.
 
    CLASS A SHARES.  Class A shares are sold at net asset value plus an initial
sales charge of up to 5.25%. The initial sales charge is reduced for certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."
 
    CLASS B SHARES.  Class B shares are offered at net asset value with no
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%)
if redeemed within six years of purchase. (Class B shares purchased by certain
qualified plans are subject to a CDSC scaled down from 2.0% to 1.0% if redeemed
within three years after purchase.) This CDSC may be waived for certain
redemptions. Class B shares are also subject to an annual 12b-1 fee of 1.0% of
the lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the Fund (not including reinvestments of dividends
or capital gains distributions), less the average daily aggregate net asset
value of the Fund's Class B shares redeemed since the Fund's inception upon
which a CDSC has been imposed or waived, or (b) the average daily net assets of
Class B. The Class B shares' distribution fee will cause that Class to have
higher expenses and pay lower dividends than Class A or Class D shares.
 
    After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative-- Class B Shares."
 
    CLASS C SHARES.  Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within one
year after purchase. This CDSC may be waived for certain redemptions. They are
subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets of
the Class C shares. The Class C shares' distribution fee may cause that Class to
have higher expenses and pay lower dividends than Class A or Class D shares. See
"Level Load Alternative--Class C Shares."
 
    CLASS D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative-- Class D Shares" below). Class D shares are
sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative-- Class D Shares."
 
    SELECTING A PARTICULAR CLASS.  In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:
 
    The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire 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 TCW/DW
Multi-Class Funds, and holdings of shares of "Exchange Funds" (see "Shareholder
Services--Exchange Privilege") for which Class A shares have been exchanged,
will be included together with the current investment amount.
 
                                       18
<PAGE>
    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
<C>        <S>                          <C>        <C>
    A      Maximum 5.25% initial sales    0.25%          No
           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% CDSC during       1.0%     B shares
           the first year decreasing               convert to A
           to 0 after six years                    shares
                                                   automatically
                                                   after
                                                   approximately
                                                   ten years
    C      1.0% CDSC during first year    1.0%           No
    D                 None                None           No
</TABLE>
 
    See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.
 
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
 
Class A shares are sold at net asset value plus an initial sales charge. In some
cases, reduced sales charges may be available, as described below. Investments
of $1 million or more (and investments by certain other limited categories of
investors) are not subject to any sales charges at the time of purchase but are
subject to a CDSC of 1.0% on redemptions made within one year after purchase
(calculated from the last day of the month in which the shares were purchased),
except for certain specific circumstances. The CDSC will be assessed on an
amount equal to the lesser of the current market value or the cost of the shares
being redeemed. The CDSC will not be imposed (i) in the 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          PUBLIC OFFERING     PERCENTAGE OF
   SINGLE 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 TCW/DW Multi-Class Funds. The sales charge payable on the
purchase of the Class A shares of the Fund and the Class A shares of the other
TCW/DW Multi-Class Funds will be at their respective rates applicable to the
total amount of the combined concurrent purchases of such shares.
 
                                       19
<PAGE>
    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 TCW/DW Multi-Class Funds previously
purchased at a price including a front-end sales charge (including shares of the
Fund, other TCW/DW Multi-Class Funds or "Exchange Funds" (see "Shareholder
Services--Exchange Privilege") acquired in exchange for those shares, and
including in each case shares acquired through reinvestment of dividends and
distributions), which are held at the time of such transaction, amounts to
$25,000 or more. If such investor has a cumulative net asset value of 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 Class A shares of other TCW/DW Multi-Class 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 other TCW/DW Multi-Class Funds or shares of
"Exchange Funds" (see "Shareholder Services--Exchange Privilege") acquired in
exchange for Class A 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 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 Dean Witter account executive who
    joined Dean Witter from another investment firm within six months prior to
    the date of purchase of Fund shares by such investors, if the shares are
    being purchased with the proceeds from a redemption of shares of an open-end
    proprietary mutual fund of the account executive's previous firm which
    imposed either a front-end or deferred sales charge, provided such purchase
    was made within sixty days after the redemption and the proceeds of the
    redemption had been maintained in the interim in cash or a money market
    fund; and
 
        (6) other categories of investors, at the discretion of the Board, as
    disclosed in the then current prospectus of the Fund.
 
    No CDSC will be imposed on redemptions of shares purchased pursuant to
paragraphs (1), (2) or (5), above.
 
    For further information concerning purchases of the Fund's shares, contact
DWR or another Selected 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
 
                                       20
<PAGE>
annual 12b-1 fee of 1.0% of the lesser of: (a) the average daily aggregate gross
sales of the Fund's Class B shares since the inception of the Fund (not
including reinvestments of dividends or capital gains distributions), less the
average daily aggregate net asset value of the Fund's Class B shares redeemed
since the Fund's inception upon which a CDSC has been imposed or waived, or (b)
the average daily net assets of Class B.
 
    Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased) will not be subject to any CDSC upon redemption.
Shares redeemed earlier than six years after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed. The size of this percentage will depend
upon how long the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
             YEAR SINCE                CDSC AS A PERCENTAGE
        PURCHASE 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                CDSC AS A PERCENTAGE
        PURCHASE 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. 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
    Manager or its parent, Dean Witter InterCapital Inc., 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 have been designated Class B shares. Shares held before May 1, 1997 will
convert to Class A shares
 
                                       21
<PAGE>
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 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 TCW/DW 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 TCW/DW 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 InterCapital mutual fund asset allocation program pursuant
to which such persons pay an asset based fee; (ii) persons participating in a
fee-based program approved by the Distributor, pursuant to which such persons
pay an asset based fee for services in the nature of investment advisory,
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) certain Unit Investment Trusts sponsored
by DWR; (iv) certain other open-end investment companies whose shares are
distributed by the Distributor; and (v) other categories of investors, at the
discretion of the Board, as disclosed in the then current prospectus of the
Fund. Investors who require a $5 million (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 TCW/DW 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 TCW/DW Multi-Class Funds, and holdings of shares of "Exchange
Funds" (see "Shareholder Services--Exchange Privilege") for which Class A shares
have been exchanged, will be included together with the
 
                                       22
<PAGE>
current investment amount. If a shareholder redeems Class A shares and purchases
Class D shares, such redemption may be a taxable event.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
with respect to the distribution of Class A, Class B and Class C shares of the
Fund. In the case of Class A and Class C shares, the Plan provides that the Fund
will reimburse the Distributor and others for the expenses of certain activities
and services incurred by them specifically on behalf of those shares.
Reimbursements for these expenses will be made in monthly payments by the Fund
to the Distributor, which will in no event exceed amounts equal to payments at
the annual rates of 0.25% and 1.0% of the average daily net assets of Class A
and Class C, respectively. In the case of Class B shares, the Plan provides that
the Fund will pay the Distributor a fee, which is accrued daily and paid
monthly, at the annual rate of 1.0% of the lesser of: (a) the average daily
aggregate gross sales of the Fund's Class B shares since the inception of the
Fund (not including reinvestments of dividends or capital gains distributions),
less the average daily aggregate net asset value of the Fund's Class B shares
redeemed since the Fund's inception upon which a CDSC has been imposed or
waived, or (b) the average daily net assets of Class B. The fee is treated by
the Fund as an expense in the year it is accrued. In the case of Class A shares,
the entire amount of the fee currently represents a service fee within the
meaning of the NASD guidelines. In the case of Class B and Class C shares, a
portion of the fee payable pursuant to the Plan, equal to 0.25% of the average
daily net assets of each of these Classes, is currently characterized as a
service fee. A service fee is a payment made for personal service and/or the
maintenance of shareholder accounts.
 
    Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of DWR's account executives
and others who engage in or support distribution of shares or who service
shareholder accounts, including overhead and telephone expenses; printing and
distribution of prospectuses and reports used in connection with the offering of
the Fund's shares to other than current shareholders; and preparation, printing
and distribution of sales literature and advertising materials. In addition, the
Distributor may utilize fees paid pursuant to the Plan in the case of Class B
shares to compensate DWR and other Selected Broker-Dealers for their opportunity
costs in advancing such amounts, which compensation would be in the form of a
carrying charge on any unreimbursed expenses.
 
    For the fiscal year ended January 31, 1998, Class B shares of the Fund
accrued payments under the Plan amounting to $3,189,480, which amount is equal
to 1.0% of the average daily net assets of Class B for the fiscal year. These
payments were calculated pursuant to clause (b) of the compensation formula
under the Plan. All shares held prior to July 28, 1997 have been designated
Class B shares. For the fiscal period July 28, 1997 through January 31, 1998,
Class A and Class C shares of the Fund accrued payments under the Plan amounting
to $120 and $3,225, 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
$20,353,215 at January 31, 1998, which was equal to 7.46% 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
through payments in any subsequent year, except that expenses representing a
gross sales commission credited to account executives at the time of sale may be
reimbursed in the subsequent calendar year. The Distributor has advised the Fund
that unreimbursed expenses representing a gross sales commission credited to
account executives at the time of sale totalled $7,256 in the case of Class C at
December 31, 1997, which amount was equal to 0.85% 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.
 
                                       23
<PAGE>
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), on each day that the New York Stock Exchange is open by
taking the net assets of the Fund, dividing by the number of shares outstanding
and adjusting to the nearest cent. The assets belonging to the Class A, Class B,
Class C and Class D shares will be invested together in a single portfolio. The
net asset value of each Class, however, will be determined separately by
subtracting each Class's accrued expenses and liabilities. The net asset value
per share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value: (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
domestic or foreign stock exchange is valued at its latest sale price on that
exchange prior to the time 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 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 available bid
price prior to the time of valuation. When market quotations are not readily
available, including circumstances under which it is determined by the Adviser
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 60 days or less at
the time of purchase are valued at amortized cost, unless the Trustees determine
such does not reflect the securities' market value, in which case these
securities will be valued at their fair value as determined by the Trustees.
 
    Certain of the Fund's portfolio securities may be valued by an outside
pricing service approved by the Fund's Trustees. The pricing service may utilize
a matrix system incorporating security quality, maturity and coupon as the
evaluation model parameters, and/or research and 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 TCW/DW Fund), unless the shareholder requests
that they be paid in cash. Shares so acquired are acquired at net asset value
and are not subject to the imposition of a front-end sales charge or a CDSC (see
"Repurchases and Redemptions").
 
    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 per share next determined after receipt
by the Transfer Agent, by returning the check or the proceeds to the Transfer
Agent within 30 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 "Repurchases and Redemptions").
 
    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 Dean Witter money market fund, on a semi-monthly,
monthly or quarterly basis, to the Transfer Agent for investment in shares of
the Fund. EasyInvest is available during any period when the Fund is offering
its shares (see "Purchase of Fund Shares" and "Repurchases and
Redemptions--Involuntary Redemption").
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September
and December) checks in any dollar amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable CDSC
will be imposed on shares redeemed under the Withdrawal Plan (see "Purchase of
Fund Shares"). Therefore, any shareholder participating in the Withdrawal Plan
will have sufficient shares redeemed from his or her account so that the
proceeds (net of any applicable CDSC) to the shareholder will be the designated
monthly or quarterly amount. Withdrawal plan payments should not be considered
as dividends,
 
                                       24
<PAGE>
yields or income. If periodic withdrawal plan payments continuously exceed net
investment income and net capital gains, the shareholder's original investment
will be correspondingly reduced and ultimately exhausted. Each withdrawal
constitutes a redemption of shares and any gain or loss realized must be
recognized for federal income tax purposes.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for information about any of the above
services.
 
    TAX SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their account executive or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
Shares of each Class may be exchanged for shares of the same Class of any other
TCW/DW Multi-Class Fund without the imposition of any exchange fee. Shares may
also be exchanged for shares of TCW/DW North American Government Income Trust
and for shares of five money market funds for which InterCapital serves as
investment manager: Dean Witter Liquid Asset Fund Inc., Dean Witter U.S.
Government Money Market Trust, Dean Witter Tax-Free Daily Income Trust, Dean
Witter California Tax-Free Daily Income Trust and Dean Witter New York Municipal
Money Market Trust (the foregoing six funds are hereinafter collectively
referred to as "Exchange Funds"). Exchanges may be made after the shares of the
Fund acquired by purchase (not by exchange or dividend reinvestment) have been
held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment.
 
    An exchange to another TCW/DW Multi-Class Fund or any Exchange Fund that is
not a money market fund is on the basis of the next calculated net asset value
per share of each fund after the exchange order is received. When exchanging
into a money market fund from the Fund or any other CDSC 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 TCW/DW
Multi-Class Funds or any Exchange Fund that is not a money market fund can be
effected on the same basis.
 
    No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired), the holding
period (for the purpose of determining the rate of the CDSC) is frozen. If those
shares are subsequently re-exchanged for shares of a TCW/DW Multi-Class Fund,
the holding period previously frozen when the first exchange was made resumes on
the last day of the month in which shares of a TCW/DW Multi-Class Fund are
reacquired. Thus, the CDSC is based upon the time (calculated as described
above) the shareholder was invested in shares of a TCW/DW Multi-Class Fund (see
"Purchase of Fund Shares"). However, in the case of shares exchanged into an
Exchange Fund, upon a redemption of shares which results in a CDSC being
imposed, a credit (not to exceed the amount of the CDSC) will be given in an
amount equal to the Exchange Fund 12b-1 distribution fees which are attributable
to those shares. (Exchange Fund 12b-1 distribution fees are described in the
prospectuses of those funds.)
 
    ADDITIONAL INFORMATION REGARDING EXCHANGES.  Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Manager to be abusive and contrary to the best interests of the
Fund's other shareholders and, at the 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, each of the other TCW/DW Funds and each of the money market
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 TCW/DW Funds or money market funds for which
shares of the Fund have been exchanged, upon such notice as may be required by
applicable regulatory agencies. Shareholders maintaining margin accounts with
DWR or another Selected Broker-Dealer are referred to their account executive
regarding restrictions on exchange of shares of the Fund pledged in the margin
account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement of
each Class of shares and any other conditions imposed by each fund. In the case
of 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
 
                                       25
<PAGE>
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 funds for
which the Exchange Privilege is available pursuant to this Exchange Privilege by
contacting their DWR or other Selected Broker-Dealer account executive (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or another Selected Broker-Dealer but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The Fund will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. The 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 will also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent transactions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her DWR or other Selected
Broker-Dealer account executive, if appropriate, or make a written exchange
request. Shareholders are advised that during periods of drastic economic or
market changes, it is possible that the telephone exchange procedures may be
difficult to implement, although this has not been the case in the past with
other funds managed by the Manager.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about the
Exchange Privilege.
 
REPURCHASES AND REDEMPTIONS
- --------------------------------------------------------------------------------
 
    REPURCHASES.  DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to any
of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker-Dealers
upon the telephonic or telegraphic request of the shareholder. The repurchase
price is the net asset value next computed (see "Purchase of Fund Shares") after
such repurchase order is received by DWR or other Selected Broker-Dealer,
reduced by any applicable CDSC (see below).
 
    The CDSC, if any, will be the only fee imposed by the Fund or the
Distributor. The offers 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 below under "Redemptions."
 
    REDEMPTIONS.  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 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 information required
by the Transfer Agent.
 
    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 shares to be redeemed have recently been purchased
by check, payment of the redemption proceeds may be delayed for the minimum time
needed to verify that the check used for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
    REINSTATEMENT PRIVILEGE.  A shareholder who has had his or her shares
repurchased or redeemed and has not previously exercised this reinstatement
privilege may, within 35 days after the date of the repurchase or redemption,
reinstate any portion or all of the proceeds of such repurchase or redemption in
shares of the Fund in the same Class from which such shares were redeemed or
repurchased, at 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 repurchase or redemption.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves the right, on 60 days' notice, to
redeem, at their net asset value, the
 
                                       26
<PAGE>
shares of any shareholder (other than shares held in an Individual Retirement
Account or Custodial Account under Section 403(b)(7) of the Internal Revenue
Code) whose shares due to redemptions by the shareholder have a value of less
than $100 or such lesser amount as may be fixed by the Trustees or, in the case
of an account opened through EasyInvest, if after twelve months the shareholder
has invested less than $1,000 in the account. However, before the Fund redeems
such shares and sends the proceeds to the shareholder, it will notify the
shareholder that the value of the shares is less than the applicable amount and
allow the shareholder 60 days to make an additional investment in an amount
which will increase the value of the account to at least the applicable amount
before the redemption is processed. No CDSC will be imposed on any involuntary
redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund declares dividends separately for
each Class of shares and intends to pay dividends and to distribute
substantially all of the Fund's net investment income and net short-term and
long-term capital gains, if any, at least once each year. The Fund may, however,
determine either to distribute or to retain all or part of any net long-term
capital gains in any year for reinvestment.
 
    The Fund may, at times, make payments from sources other than income or net
capital gains. Payments from such sources would, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments would not be taxable to shareholders, and would reduce the
shareholder's cost basis in his or her shares.
 
    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 and/or distributions 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 capital gains to shareholders and otherwise continue to qualify as a
regulated investment company under Subchapter M of the Internal Revenue Code, it
is not expected that the Fund will be required to pay any federal income tax.
Shareholders who are required to pay taxes on their income will normally have to
pay federal income taxes, and any state income taxes, on the dividends and
distributions they receive from the Fund. Such dividends and distributions, to
the extent that they are derived from net investment income or short-term
capital gains, are taxable to the shareholder as ordinary income regardless of
whether the shareholder receives such payments 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. Dividend payments will
generally not be eligible for the federal dividends received deduction.
 
    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.
 
    Any dividend or capital gains distribution received by a shareholder from
any investment company will have the effect of reducing the net asset value of
the shareholder's stock in that company by the exact amount of the dividend or
capital gains distribution. Furthermore, capital gains distributions and
dividends are subject to federal income taxes. If the net asset value of the
shares should be reduced below a shareholder's cost as a result of the payment
of dividends or the distribution of realized net long-term capital gains, such
payment or distribution would be in part a return of the shareholder's
investment to the extent of such reduction below the shareholder's cost, but
nonetheless would be fully taxable at either ordinary or capital gain rates.
Therefore, an investor should consider the tax implications of purchasing Fund
shares immediately prior to a dividend or distribution record date.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources would, in effect, represent a return
of a portion of each shareholder's investment. All, or a portion, of such
payments would not be taxable to shareholders.
 
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes.
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.
 
    Dividends, interest and capital gains received by the Fund may give rise to
withholding and other taxes imposed
 
                                       27
<PAGE>
by foreign countries. If it qualifies for and has made the appropriate election
with the Internal Revenue Service, the Fund will report annually to its
shareholders the amount per share of such taxes, to enable shareholders to claim
United States foreign tax credits or deductions with respect to such taxes. In
the absence of such an election, the Fund would deduct foreign tax in computing
the amount of its distributable income.
 
    The foregoing discussion relates solely to the federal income tax
consequences of an investment in the Fund. Distributions may also be subject to
state and local taxes; therefore, each shareholder is advised to consult his or
her own tax adviser.
 
    Shareholders should consult their tax advisers as to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the Fund may quote its "total return" in advertisements and
sales literature. These figures are computed separately for Class A, Class B,
Class C and Class D shares. The total return of the Fund is based on historical
earnings and is not intended to indicate future performance. The "average annual
total return" of the Fund refers to a figure reflecting the average annualized
percentage increase (or decrease) in the value of an initial investment in a
Class of the Fund of $1,000 over one year, five years, as well as over the life
of the Fund. Average annual total return reflects all income earned by the Fund,
any appreciation or depreciation of the Fund's assets, all expenses incurred by
the applicable Class and all sales charges which would be incurred by
shareholders, for the stated periods. It also assumes reinvestment of all
dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the Fund may advertise its total return for
each Class over different periods of time by means of aggregate, average, and
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.).
 
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 Investment Company Act or the Declaration of
Trust. Under certain circumstances, the Trustees may be removed by action of the
Trustees or by the shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for obligations of the
Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that Fund
obligations include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Fund's property for any shareholder held
personally liable for the obligations of the Fund. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Fund itself would be unable to meet its
obligations. Given the above limitations on shareholder personal liability, and
the nature of the Fund's assets and operations, 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.  The Adviser is subject to a Code of Ethics with respect to
investment transactions in which the Adviser's officers, directors and certain
other persons have a beneficial interest to avoid any actual or potential
conflict or abuse of their fiduciary position. The Code of Ethics, as it
pertains to the TCW/DW Funds, contains several restrictions and procedures
designed to eliminate conflicts of interest including: (a) pre-clearance of
personal investment transactions to ensure that personal transactions by
employees are
 
                                       28
<PAGE>
not being conducted at the same time as the Adviser's clients; (b) quarterly
reporting of personal securities transactions; (c) a prohibition against
personally acquiring securities in an initial public offering, entering into
uncovered short sales and writing uncovered options; (d) a seven day "black-out
period" prior or subsequent to a TCW/DW Fund transaction during which portfolio
managers are prohibited from making certain transactions in securities which are
being purchased or sold by a TCW/DW Fund; (e) a prohibition, with respect to
certain investment personnel, from profiting in the purchase and sale, or sale
and purchase, of the same (or equivalent) securities within 60 calendar days;
and (f) a prohibition against acquiring any security which is subject to firm
wide or, if applicable, a department restriction of the Adviser. The Code of
Ethics provides that exemptive relief may be given from certain of its
requirements, upon application. The Adviser's Code of Ethics complies with
regulatory requirements and, insofar as it relates to persons associated with
registered investment companies, the 1994 Report of the Advisory Group on
Personal Investing of the Investment Company Institute.
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the telephone number or address set forth on the front cover of
this Prospectus.
 
                                       29
<PAGE>
TCW/DW LATIN AMERICAN GROWTH FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
John C. Argue
Richard M. DeMartini
Charles A. Fiumefreddo
John R. Haire
Dr. Manuel H. Johnson
Thomas E. Larkin, Jr.
Michael E. Nugent
John L. Schroeder
Marc I. Stern
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
 
Thomas E. Larkin, Jr.
President
 
Barry Fink
Vice President, Secretary and General Counsel
 
Michael P. Reilly
Vice President
 
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Chase Manhattan Bank
One Chase Plaza
New York, New York 10005
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
MANAGER
Dean Witter Services Company Inc.
 
ADVISER
TCW Funds Management, Inc.


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