MORGAN STANLEY DEAN WITTER NATURAL RESOURCE DEVELOPEMENT SEC
497, 2000-05-08
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<PAGE>
                                                    PROSPECTUS -  APRIL 28, 2000

Morgan Stanley Dean Witter
                                         NATURAL RESOURCE DEVELOPMENT SECURITIES

[COVER PHOTO]

                                         A MUTUAL FUND THAT SEEKS CAPITAL GROWTH

  The Securities and Exchange Commission has not approved or disapproved these
                           Securities or passed upon
    the adequacy of this PROSPECTUS. Any representation to the contrary is a
                               criminal offense.
<PAGE>
CONTENTS

<TABLE>
<S>                                <C>                                   <C>
The Fund                           Investment Objective................                   1
                                   Principal Investment Strategies.....                   1
                                   Principal Risks.....................                   2
                                   Past Performance....................                   3
                                   Fees and Expenses...................                   4
                                   Additional Investment Strategy
                                   Information.........................                   5
                                   Additional Risk Information.........                   6
                                   Fund Management.....................                   6

Shareholder Information            Pricing Fund Shares.................                   7
                                   How to Buy Shares...................                   7
                                   How to Exchange Shares..............                   8
                                   How to Sell Shares..................                  10
                                   Distributions.......................                  12
                                   Tax Consequences....................                  12
                                   Share Class Arrangements............                  13

Financial Highlights               ....................................                  21

Our Family of Funds                ....................................   Inside Back Cover

                                   THIS PROSPECTUS CONTAINS IMPORTANT INFORMATION ABOUT THE
                                   FUND. PLEASE READ IT CAREFULLY AND KEEP IT FOR FUTURE
                                   REFERENCE.
</TABLE>
<PAGE>
[Sidebar]
CAPITAL GROWTH
An investment objective having the goal of selecting securities with the
potential to rise in price rather than pay out income.
[End Sidebar]
THE FUND

[ICON]              INVESTMENT OBJECTIVE
- --------------------------------------------------------------------------------
                    Morgan Stanley Dean Witter Natural Resource Development
                    Securities Inc. seeks capital growth.
[ICON]              PRINCIPAL INVESTMENT STRATEGIES
- --------------------------------------------------------------------------------
                    The Fund will normally invest at least 65% of its total
                    assets in common stocks (including depository receipts) of
                    domestic and foreign companies engaged in the natural
                    resource and related businesses. These companies may be
                    engaged in the exploration, development, production or
                    distribution of natural resources, the development of
                    energy-efficient technologies or in providing natural
                    resource related supplies or services. A company will be
                    considered engaged in the natural resource and related
                    businesses if it derives at least 50% of its revenues from
                    those businesses or it devotes at least 50% of its assets to
                    activities in those businesses. The Investment Manager will
                    seek to identify favorable industries within the natural
                    resource and related business area and will seek to invest
                    in companies with attractive valuations or business
                    prospects within those industries.
                    The Fund's "Investment Manager," Morgan Stanley Dean Witter
                    Advisors Inc., invests in companies that it believes are
                    responsive to domestic and world demand for natural
                    resources and that engage in the development of natural
                    resources. These companies include those that:
                    - own or process natural resources, such as precious metals,
                      other minerals, water, timberland and forest products;
                    - own or produce sources of energy such as oil, natural gas,
                      coal, uranium, geothermal, oil shale and biomass;
                    - participate in the exploration for and development of
                      natural resource supplies from new and conventional
                      sources;
                    - own or control oil, gas, or other mineral leases, rights
                      or royalty interests;
                    - provide natural resource transportation, distribution or
                      processing services, such as refining and pipeline
                      services;
                    - provide related services or supplies, such as drilling,
                      well servicing, chemicals, parts and equipment; or
                    - contribute energy-efficient technologies, such as systems
                      for energy conversion, conservation and pollution control.
                    Common stock is a share ownership or equity interest in a
                    corporation. It may or may not pay dividends, as some
                    companies reinvest all of their profits back into their
                    businesses, while others pay out some of their profits to
                    shareholders as dividends.

                    The Fund may invest up to 25% of its total assets in foreign
                    securities, including depository receipts. This percentage
                    limitation, however, does not apply to securities of foreign
                    companies that are listed in the U.S. on a national
                    securities exchange or

                                                                               1
<PAGE>
                    to securities of Canadian issuers. A depository receipt is
                    generally issued by a bank or financial institution and
                    represents an ownership interest in the common stock or
                    other equity securities of a foreign company.
                    In addition, the Fund also may invest up to 35% of its
                    assets in common stock of companies not engaged in the
                    natural resource and related business areas and fixed-income
                    securities.
                    In pursuing the Fund's investment objective, the Investment
                    Manager has considerable leeway in deciding which
                    investments it buys, holds or sells on a day-to-day
                    basis -- and which trading strategies it uses. For example,
                    the Investment Manager in its discretion may determine to
                    use some permitted trading strategies while not using
                    others.
[ICON]              PRINCIPAL RISKS
- --------------------------------------------------------------------------------
                    There is no assurance that the Fund will achieve its
                    investment objective. The Fund's share price will fluctuate
                    with changes in the market value of the Fund's portfolio
                    securities. When you sell Fund shares, they may be worth
                    less than what you paid for them and, accordingly, you can
                    lose money investing in this Fund.
                    A principal risk of investing in the Fund is associated with
                    its common stock investments. In general, stock values
                    fluctuate in response to activities specific to the company
                    as well as general market, economic and political
                    conditions. Stock prices can fluctuate widely in response to
                    these factors.
                    NATURAL RESOURCES. The Fund's investments in natural
                    resource industries can be significantly affected by events
                    relating to those industries, such as international
                    political and economic developments, energy conservation,
                    the success of exploration projects, tax and other
                    government regulations, as well as other factors. The Fund's
                    portfolio securities, and consequently the Fund's net asset
                    value, may experience substantial price fluctuations as a
                    result of these factors. Unlike most diversified mutual
                    funds, the Fund is subject to the risks associated with
                    concentrating its assets in a particular sector - natural
                    resources. Thus, the Fund's overall portfolio may decline in
                    value due to developments specific to this sector. Given the
                    Fund's concentration policy, Fund shares should not be
                    considered a complete investment program.
                    FOREIGN SECURITIES. The Fund's investments in foreign
                    securities involve risks that are in addition to the risks
                    associated with domestic securities. One additional risk is
                    currency risk. While the price of Fund shares is quoted in
                    U.S. dollars, the Fund generally converts U.S. dollars to a
                    foreign market's local currency to purchase a security in
                    that market. If the value of that local currency falls
                    relative to the U.S. dollar, the U.S. dollar value of the
                    foreign security will decrease. This is true even if the
                    foreign security's local price remains unchanged.
                    Foreign securities (including depository receipts) also have
                    risks related to economic and political developments abroad,
                    including expropriations, confiscatory taxation, exchange
                    control regulation, limitations on the use or transfer of
                    Fund assets and any effects of foreign social, economic or
                    political instability. Foreign companies, in

 2
<PAGE>
[Sidebar]
ANNUAL TOTAL RETURNS
This chart shows how the performance of the Fund's Class B shares has varied
from year to year over the past 10 calendar years.
[End Sidebar]
                    general, are not subject to the regulatory requirements of
                    U.S. companies and, as such, there may be less publicly
                    available information about these companies. Moreover,
                    foreign accounting, auditing and financial reporting
                    standards generally are different from those applicable to
                    U.S. companies. Finally, in the event of a default of any
                    foreign debt obligations, it may be more difficult for the
                    Fund to obtain or enforce a judgment against the issuers of
                    the securities.
                    Securities of foreign issuers may be less liquid than
                    comparable securities of U.S. issuers and, as such, their
                    price changes may be more volatile. Furthermore, foreign
                    exchanges and broker-dealers are generally subject to less
                    government and exchange scrutiny and regulation than their
                    U.S. counterparts. In addition, differences in clearance and
                    settlement procedures in foreign markets may occasion delays
                    in settlement of the Fund's trades effected in those
                    markets.
                    The performance of the Fund also will depend on whether or
                    not the Investment Manager is successful in pursuing the
                    Fund's investment strategy. The Fund is also subject to
                    other risks from its permissible investments including the
                    risks associated with its fixed-income investments. For more
                    information about these risks, see the "Additional Risk
                    Information" section.
                    Shares of the Fund are not bank deposits and are not
                    guaranteed or insured by the FDIC or any other government
                    agency.
[ICON]              PAST PERFORMANCE
- --------------------------------------------------------------------------------
                    The bar chart and table below provide some indication of the
                    risks of investing in the Fund. The Fund's past performance
                    does not indicate how the Fund will perform in the future.
                    ANNUAL TOTAL RETURNS - CALENDAR YEARS

                    EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC

<TABLE>
<S>  <C>
`90   -8.73%
`91    6.39%
`92    6.67%
`93   17.45%
`94   -0.93%
`95   23.40%
`96   27.00%
`97   14.02%
`98  -21.76%
`99   26.36%
</TABLE>

                    The bar chart reflects the performance of Class B shares;
                    the performance of the other Classes will differ because the
                    Classes have different ongoing fees. The performance
                    information in the bar chart does not reflect the deduction
                    of sales charges; if these amounts were reflected, returns
                    would be less than shown. Year-to-date total return as of
                    March 31, 2000 was 4.53%.
                    During the periods shown in the bar chart, the highest
                    return for a calendar quarter was 15.93% (quarter ended
                    June 30, 1999) and the lowest return for a calendar quarter
                    was -18.59% (quarter ended September 30, 1998).

                                                                               3
<PAGE>
[Sidebar]
AVERAGE ANNUAL
TOTAL RETURNS
This table compares the Fund's average annual returns with those of a broad
measure of market performance over time. The Fund's returns include the maximum
applicable sales charge for each Class and assume you sold your shares at the
end of each period.
[End Sidebar]
[Sidebar]
SHAREHOLDER FEES
These fees are paid directly from your investment.
[End Sidebar]
[Sidebar]
ANNUAL FUND
OPERATING EXPENSES
These expenses are deducted from the Fund's assets and are based on expenses
paid for the fiscal year ended February 29, 2000.
[End Sidebar]

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURNS (AS OF DECEMBER 31, 1999)
                               ---------------------------------------------------------------------------------------
                                                                      PAST 1 YEAR      PAST 5 YEARS      PAST 10 YEARS
                               <S>                                    <C>              <C>               <C>
                               ---------------------------------------------------------------------------------------
                                Class A(1)                              20.79%              --                --
                               ---------------------------------------------------------------------------------------
                                Class B                                 21.36%            11.80%             7.85%
                               ---------------------------------------------------------------------------------------
                                Class C(1)                              25.38%              --                --
                               ---------------------------------------------------------------------------------------
                                Class D(1)                              27.75%              --                --
                               ---------------------------------------------------------------------------------------
                                S&P 500 Index(2)                        21.04%            28.54%            18.20%
                               ---------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
1                       Classes A, C and D commenced operations on July 28, 1997.
2                       The Standard & Poor's-Registered Trademark- 500 Stock Index
                        (S&P 500 Index) is a broad-based index, the performance of
                        which is based on the average performance of 500 widely held
                        common stocks. The performance of the Index does not include
                        any expenses, fees or charges. The Index is unmanaged and
                        should not be considered an investment.
</TABLE>

[ICON]              FEES AND EXPENSES
- --------------------------------------------------------------------------------
                    The table below briefly describes the fees and expenses that
                    you may pay if you buy and hold shares of the Fund. The Fund
                    offers four Classes of shares: Classes A, B, C and D. Each
                    Class has a different combination of fees, expenses and
                    other features. The Fund does not charge account or exchange
                    fees. See the "Share Class Arrangements" section for further
                    fee and expense information.

<TABLE>
<CAPTION>
                                                                         CLASS A       CLASS B       CLASS C       CLASS D
                               <S>                                       <C>           <C>           <C>           <C>
                               --------------------------------------------------------------------------------------------
                                SHAREHOLDER FEES
                               --------------------------------------------------------------------------------------------
                                Maximum sales charge (load) imposed
                                on purchases (as a percentage of
                                offering price)                           5.25%(1)     None          None          None
                               --------------------------------------------------------------------------------------------
                                Maximum deferred sales charge (load)
                                (as a percentage based on the lesser
                                of the offering price or net asset
                                value at redemption)                     None(2)        5.00%(3)      1.00%(4)     None
                               --------------------------------------------------------------------------------------------
                                ANNUAL FUND OPERATING EXPENSES
                               --------------------------------------------------------------------------------------------
                                Management fee                            0.62%         0.62%         0.62%         0.62%
                               --------------------------------------------------------------------------------------------
                                Distribution and service (12b-1) fees     0.23%         1.00%         1.00%        None
                               --------------------------------------------------------------------------------------------
                                Other expenses                            0.27%         0.27%         0.27%         0.27%
                               --------------------------------------------------------------------------------------------
                                Total annual Fund operating expenses      1.12%         1.89%         1.89%         0.89%
                               --------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
1                       Reduced for purchases of $25,000 and over.
2                       Investments that are not subject to any sales charge at the
                        time of purchase are subject to a contingent deferred sales
                        charge ("CDSC") of 1.00% that will be imposed if you sell
                        your shares within one year after purchase, except for
                        certain specific circumstances.
3                       The CDSC is scaled down to 1.00% during the sixth year,
                        reaching zero thereafter. See "Share Class Arrangements" for
                        a complete discussion of the CDSC.
4                       Only applicable if you sell your shares within one year
                        after purchase.
</TABLE>

 4
<PAGE>
                    EXAMPLE
                    This example is intended to help you compare the cost of
                    investing in the Fund with the cost of investing in other
                    mutual funds.

                    The example assumes that you invest $10,000 in the Fund,
                    your investment has a 5% return each year, and the Fund's
                    operating expenses remain the same. Although your actual
                    costs may be higher or lower, the tables below show your
                    costs at the end of each period based on these assumptions
                    depending upon whether or not you sell your shares at the
                    end of each period.
<TABLE>
<CAPTION>
                                                                 IF YOU SOLD YOUR SHARES:
                                                        -------------------------------------------
                                                         1 YEAR     3 YEARS     5 YEARS    10 YEARS
                               <S>                      <C>         <C>         <C>        <C>
                               --------------------------------------------------------------------
                                CLASS A                   $633        $862      $1,110      $1,817
                               --------------------------------------------------------------------
                                CLASS B                   $692        $894      $1,221      $2,212
                               --------------------------------------------------------------------
                                CLASS C                   $292        $594      $1,021      $2,212
                               --------------------------------------------------------------------
                                CLASS D                   $ 91        $284      $  493      $1,096
                               --------------------------------------------------------------------

<CAPTION>
                                                               IF YOU HELD YOUR SHARES:
                                                      -------------------------------------------
                                                       1 YEAR     3 YEARS     5 YEARS    10 YEARS
                               <S>                    <C>         <C>         <C>        <C>
                               ---------------------  -------------------------------------------
                                CLASS A                 $633        $862      $1,110      $1,817
                               ---------------------  -------------------------------------------
                                CLASS B                 $192        $594      $1,021      $2,212
                               ---------------------  -------------------------------------------
                                CLASS C                 $192        $594      $1,021      $2,212
                               ---------------------  -------------------------------------------
                                CLASS D                 $ 91        $284      $  493      $1,096
                               ---------------------  -------------------------------------------
</TABLE>

                    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.

[ICON]              ADDITIONAL INVESTMENT STRATEGY INFORMATION
- --------------------------------------------------------------------------------
                    This section provides additional information relating to the
                    Fund's principal strategies.

                    OTHER INVESTMENTS. The Fund may also invest up to 35% of its
                    assets in common stocks of companies not engaged in the
                    natural resource and related business area, investment grade
                    corporate debt securities (including zero coupon securities)
                    and U.S. government securities (including zero coupon
                    securities). The Fund's fixed-income investments may include
                    zero coupon securities, which are purchased at a discount
                    and either (i) pay no interest, or (ii) accrue interest but
                    make no payments until maturity.

                    DEFENSIVE INVESTING. The Fund may take temporary "defensive"
                    positions in attempting to respond to adverse market
                    conditions. The Fund may invest any amount of its assets in
                    cash or money market instruments in a defensive posture when
                    the Investment Manager believes it is advisable to do so.
                    Although taking a defensive posture is designed to protect
                    the Fund from an anticipated market downturn, it could have
                    the effect of reducing the benefit from any upswing in the
                    market. When a Fund takes a defensive position, it may not
                    achieve its investment objective.

                    The percentage limitations relating to the composition of
                    the Fund's portfolio apply at the time the Fund acquires an
                    investment and refer to the Fund's net assets, unless
                    otherwise noted. Subsequent percentage changes that result
                    from market fluctuations will not require the Fund to sell
                    any portfolio security. The Fund may change its principal
                    investment strategies without shareholder approval; however,
                    you would be notified of any changes.

                                                                               5
<PAGE>
[Sidebar]
MORGAN STANLEY DEAN WITTER ADVISORS INC.
The Investment Manager is widely recognized as a leader in the mutual fund
industry and together with Morgan Stanley Dean Witter Services Company Inc., its
wholly-owned subsidiary, had approximately $155 billion in assets under
management as of March 31, 2000.
[End Sidebar]

[ICON]              ADDITIONAL RISK INFORMATION
- --------------------------------------------------------------------------------
                    This section provides additional information relating to the
                    principal risks of investing in the Fund.

                    FIXED-INCOME SECURITIES. Principal risks of investing in the
                    Fund are associated with its fixed-income investments. All
                    fixed-income securities, such as corporate debt, are subject
                    to two types of risk: credit risk and interest rate risk.
                    Credit risk refers to the possibility that the issuer of a
                    security will be unable to make interest payments and/or
                    repay the principal on its debt.

                    Interest rate risk refers to fluctuations in the value of a
                    fixed-income security resulting from changes in the general
                    level of interest rates. When the general level of interest
                    rates goes up, the prices of most fixed-income securities go
                    down. When the general level of interest rates goes down,
                    the prices of most fixed-income securities go up. (Zero
                    coupon securities are typically subject to greater price
                    fluctuations than comparable securities that pay interest.)

[ICON]              FUND MANAGEMENT
- --------------------------------------------------------------------------------
                    The Fund has retained the Investment Manager -- Morgan
                    Stanley Dean Witter Advisors Inc. -- to provide
                    administrative services, manage its business affairs and
                    invest its assets, including the placing of orders for the
                    purchase and sale of portfolio securities. The Investment
                    Manager is a wholly-owned subsidiary of Morgan Stanley Dean
                    Witter & Co., a preeminent global financial services firm
                    that maintains leading market positions in each of its three
                    primary businesses: securities, asset management and credit
                    services. Its main business office is located at Two World
                    Trade Center, New York, NY 10048.

                    The Fund is managed within the Investment Manager's Growth
                    Group. David F. Myers, a Vice President of the Investment
                    Manager, has been a primary portfolio manager of the Fund
                    since July 1997 and the sole portfolio manager of the Fund
                    since July 1999. Mr. Myers has been a portfolio manager at
                    the Investment Manager for over five years.

                    The Fund pays the Investment Manager a monthly management
                    fee as full compensation for the services and facilities
                    furnished to the Fund, and for Fund expenses assumed by the
                    Investment Manager. The fee is based on the Fund's average
                    daily net assets. For the fiscal year ended February 29,
                    2000 the Fund accrued total compensation to the Investment
                    Manager amounting to 0.62% of the Fund's average daily net
                    assets.

 6
<PAGE>
[Sidebar]
CONTACTING A
FINANCIAL ADVISOR
If you are new to the Morgan Stanley Dean Witter Family of Funds and would like
to contact a Financial Advisor, call
(877)937-MSDW (toll-free) for the telephone number of the Morgan Stanley Dean
Witter office nearest you. You may also access our office locator on our
Internet site at:
www.msdw.com/individual/funds
[End Sidebar]
SHAREHOLDER INFORMATION

[ICON]              PRICING FUND SHARES
- --------------------------------------------------------------------------------
                    The price of Fund shares (excluding sales charges), called
                    "net asset value," is based on the value of the Fund's
                    portfolio securities. While the assets of each Class are
                    invested in a single portfolio of securities, the net asset
                    value of each Class will differ because the Classes have
                    different ongoing distribution fees.
                    The net asset value per share of the Fund is determined once
                    daily at 4:00 p.m. Eastern time on each day that the New
                    York Stock Exchange is open (or, on days when the New York
                    Stock Exchange closes prior to 4:00 p.m., at such earlier
                    time). Shares will not be priced on days that the New York
                    Stock Exchange is closed.
                    The value of the Fund's portfolio securities is based on the
                    securities' market price when available. When a market price
                    is not readily available, including circumstances under
                    which the Investment Manager determines that a security's
                    market price is not accurate, a portfolio security is valued
                    at its fair value, as determined under procedures
                    established by the Fund's Board of Directors. In these
                    cases, the Fund's net asset value will reflect certain
                    portfolio securities' fair value rather than their market
                    price. With respect to securities that are primarily listed
                    on foreign exchanges, the value of the Fund's portfolio
                    securities may change on days when you will not be able to
                    purchase or sell your shares.
                    An exception to the Fund's general policy of using market
                    prices concerns its short-term debt portfolio securities.
                    Debt securities with remaining maturities of sixty days or
                    less at the time of purchase are valued at amortized cost.
                    However, if the cost does not reflect the securities' market
                    value, these securities will be valued at their fair value.
[ICON]              HOW TO BUY SHARES
- --------------------------------------------------------------------------------
                    You may open a new account to buy Fund shares or buy
                    additional Fund shares for an existing account by contacting
                    your Morgan Stanley Dean Witter Financial Advisor or other
                    authorized financial representative. Your Financial Advisor
                    will assist you, step-by-step, with the procedures to invest
                    in the Fund. You may also purchase shares directly by
                    calling the Fund's transfer agent and requesting an
                    application.
                    Because every investor has different immediate financial
                    needs and long-term investment goals, the Fund offers
                    investors four Classes of shares: Classes A, B, C and D.
                    Class D shares are only offered to a limited group of
                    investors. Each Class of shares offers a distinct structure
                    of sales charges, distribution and service fees, and other
                    features that are designed to address a variety of needs.
                    Your Financial Advisor or other authorized financial
                    representative can help you decide which Class may be most
                    appropriate for you. When purchasing Fund shares, you must
                    specify which Class of shares you wish to purchase.
                    When you buy Fund shares, the shares are purchased at the
                    next share price calculated (less any applicable front-end
                    sales charge for Class A shares) after we receive your
                    purchase order. Your payment is due on the third business
                    day after you place your purchase order. We reserve the
                    right to reject any order for the purchase of Fund shares.

                                                                               7
<PAGE>
[Sidebar]
EASYINVEST-SM-
A purchase plan that allows you to transfer money automatically from your
checking or savings account or from a Money Market Fund on a semi-monthly,
monthly or quarterly basis. Contact your Morgan Stanley Dean Witter Financial
Advisor for further information about this service.
[End Sidebar]

<TABLE>
<CAPTION>
                               MINIMUM INVESTMENT AMOUNTS
                               ----------------------------------------------------------------------------------------
                                                                                                 MINIMUM INVESTMENT
                                                                                             --------------------------
                               INVESTMENT OPTIONS                                            INITIAL         ADDITIONAL
                               <S>                           <C>                             <C>             <C>
                               ----------------------------------------------------------------------------------------
                                Regular accounts                                             $1,000            $100
                               ----------------------------------------------------------------------------------------
                                Individual Retirement
                                Accounts:                    Regular IRAs                    $1,000            $100
                                                             Education IRAs                    $500            $100
                               ----------------------------------------------------------------------------------------
                                EASYINVEST-SM-
                                (Automatically from your
                                checking or savings account
                                or Money Market Fund)                                         $100*            $100*
                               ----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
*                       Provided your schedule of investments totals $1,000 in
                        twelve months.
</TABLE>

                    There is no minimum investment amount if you purchase Fund
                    shares through: (1) the Investment Manager's mutual fund
                    asset allocation plan, (2) a program, approved by the Fund's
                    distributor, in which you pay an asset-based fee for
                    advisory, administrative and/or brokerage services, or
                    (3) employer-sponsored employee benefit plan accounts.
                    INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND OTHER
                    INVESTORS/CLASS D SHARES. To be eligible to purchase
                    Class D shares, you must qualify under one of the investor
                    categories specified in the "Share Class Arrangements"
                    section of this PROSPECTUS.
                    SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In
                    addition to buying additional Fund shares for an existing
                    account by contacting your Morgan Stanley Dean Witter
                    Financial Advisor, you may send a check directly to the
                    Fund. To buy additional shares in this manner:
                    - Write a "letter of instruction" to the Fund specifying the
                      name(s) on the account, the account number, the social
                      security or tax identification number, the Class of shares
                      you wish to purchase and the investment amount (which
                      would include any applicable front-end sales charge). The
                      letter must be signed by the account owner(s).
                    - Make out a check for the total amount payable to: Morgan
                      Stanley Dean Witter Natural Resource Development
                      Securities Inc.
                    - Mail the letter and check to Morgan Stanley Dean Witter
                      Trust FSB at P.O. Box 1040, Jersey City, NJ 07303.
[ICON]              HOW TO EXCHANGE SHARES
- --------------------------------------------------------------------------------
                    PERMISSIBLE FUND EXCHANGES. You may exchange shares of any
                    Class of the Fund for the same Class of any other
                    continuously offered Multi-Class Fund, or for shares of a
                    No-Load Fund, a Money Market Fund, North American Government
                    Income Trust or Short-Term U.S. Treasury Trust, without the
                    imposition of an exchange fee. See the inside back cover of
                    this PROSPECTUS for each Morgan Stanley Dean Witter Fund's
                    designation as a Multi-Class Fund, No-Load Fund or Money
                    Market Fund. If a Morgan Stanley Dean Witter Fund is not
                    listed, consult the inside back cover of

 8
<PAGE>
                    that fund's prospectus for its designation. For purposes of
                    exchanges, shares of FSC Funds (subject to a front-end sales
                    charge) are treated as Class A shares of a Multi-Class Fund.
                    Exchanges may be made after shares of the Fund acquired by
                    purchase have been held for thirty days. There is no waiting
                    period for exchanges of shares acquired by exchange or
                    dividend reinvestment. The current prospectus for each fund
                    describes its investment objective(s), policies and
                    investment minimums, and should be read before investment.
                    Since exchanges are available only into continuously offered
                    Morgan Stanley Dean Witter Funds, exchanges are not
                    available into any new Morgan Stanley Dean Witter Fund
                    during its initial offering period, or when shares of a
                    particular Morgan Stanley Dean Witter Fund are not being
                    offered for purchase.
                    EXCHANGE PROCEDURES. You can process an exchange by
                    contacting your Morgan Stanley Dean Witter Financial Advisor
                    or other authorized financial representative. Otherwise, you
                    must forward an exchange privilege authorization form to the
                    Fund's transfer agent -- Morgan Stanley Dean Witter Trust
                    FSB -- and then write the transfer agent or call
                    (800) 869-NEWS to place an exchange order. You can obtain an
                    exchange privilege authorization form by contacting your
                    Financial Advisor or other authorized financial
                    representative or by calling (800) 869-NEWS. If you hold
                    share certificates, no exchanges may be processed until we
                    have received all applicable share certificates.
                    An exchange to any Morgan Stanley Dean Witter Fund (except a
                    Money Market Fund) is made on the basis of the next
                    calculated net asset values of the Funds involved after the
                    exchange instructions are accepted. When exchanging into a
                    Money Market Fund, the Fund's shares are sold at their next
                    calculated net asset value and the Money Market Fund's
                    shares are purchased at their net asset value on the
                    following business day.
                    The Fund may terminate or revise the exchange privilege upon
                    required notice. The check writing privilege is not
                    available for Money Market Fund shares you acquire in an
                    exchange.
                    TELEPHONE EXCHANGES. For your protection when calling Morgan
                    Stanley Dean Witter Trust FSB, we will employ reasonable
                    procedures to confirm that exchange instructions
                    communicated over the telephone are genuine. These
                    procedures may include requiring various forms of personal
                    identification such as name, mailing address, social
                    security or other tax identification number. Telephone
                    instructions also may be recorded.
                    Telephone instructions will be accepted if received by the
                    Fund's transfer agent between 9:00 a.m. and 4:00 p.m.
                    Eastern time on any day the New York Stock Exchange is open
                    for business. During periods of drastic economic or market
                    changes, it is possible that the telephone exchange
                    procedures may be difficult to implement, although this has
                    not been the case with the Fund in the past.

                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the sale of such
                    shares.

                                                                               9
<PAGE>
                    TAX CONSIDERATIONS OF EXCHANGES. If you exchange shares of
                    the Fund for shares of another Morgan Stanley Dean Witter
                    Fund there are important tax considerations. For tax
                    purposes, the exchange out of the Fund is considered a sale
                    of Fund shares -- and the exchange into the other Fund is
                    considered a purchase. As a result, you may realize a
                    capital gain or loss.
                    You should review the "Tax Consequences" section and consult
                    your own tax professional about the tax consequences of an
                    exchange.
                    LIMITATIONS ON EXCHANGES. Certain patterns of past exchanges
                    and/or purchase or sale transactions involving the Fund or
                    other Morgan Stanley Dean Witter Funds may result in the
                    Fund limiting or prohibiting, at its discretion, additional
                    purchases and/or exchanges. Determinations in this regard
                    may be based on the frequency or dollar amount of previous
                    exchanges or purchase or sale transactions. You will be
                    notified in advance of limitations or your exchange
                    privileges.
                    CDSC CALCULATIONS ON EXCHANGES. See the "Share Class
                    Arrangements" section of this PROSPECTUS for a further
                    discussion of how applicable contingent deferred sales
                    charges (CDSCs) are calculated for shares of one Morgan
                    Stanley Dean Witter Fund that are exchanged for shares of
                    another.
                    FOR FURTHER INFORMATION REGARDING EXCHANGE PRIVILEGES, YOU
                    SHOULD CONTACT YOUR MORGAN STANLEY DEAN WITTER FINANCIAL
                    ADVISOR OR CALL (800) 869-NEWS.
[ICON]              HOW TO SELL SHARES
- --------------------------------------------------------------------------------
                    You can sell some or all of your Fund shares at any time. If
                    you sell Class A, Class B or Class C shares, your net sale
                    proceeds are reduced by the amount of any applicable CDSC.
                    Your shares will be sold at the next price calculated after
                    we receive your order to sell as described below.

<TABLE>
<CAPTION>
                               OPTIONS               PROCEDURES
                               <S>                   <C>
                               ----------------------------------------------------------------------------------
                                Contact your         To sell your shares, simply call your Morgan Stanley Dean
                                Financial Advisor    Witter Financial Advisor or other authorized financial
                                                     representative.
                                                     ------------------------------------------------------------
                                [ICON]               Payment will be sent to the address to which the account is
                                                     registered or deposited in your brokerage account.
                               ----------------------------------------------------------------------------------
                                By Letter            You can also sell your shares by writing a "letter of
                                                     instruction" that includes:
                                [ICON]               - your account number;
                                                     - the dollar amount or the number of shares you wish to
                                                       sell;
                                                     - the Class of shares you wish to sell; and
                                                     - the signature of each owner as it appears on the account.
                                                     ------------------------------------------------------------
                                                     If you are requesting payment to anyone other than the
                                                     registered owner(s) or that payment be sent to any address
                                                     other than the address of the registered owner(s) or
                                                     pre-designated bank account, you will need a signature
                                                     guarantee. You can obtain a signature guarantee from an
                                                     eligible guarantor acceptable to Morgan Stanley Dean Witter
                                                     Trust FSB. (You should contact Morgan Stanley Dean Witter
                                                     Trust FSB at (800) 869-NEWS for a determination as to
                                                     whether a particular institution is an eligible guarantor.)
                                                     A notary public CANNOT provide a signature guarantee.
                                                     Additional documentation may be required for shares held by
                                                     a corporation, partnership, trustee or executor.
                                                     ------------------------------------------------------------
</TABLE>

 10
<PAGE>
<TABLE>
<CAPTION>
                               OPTIONS               PROCEDURES
                               ----------------------------------------------------------------------------------
                               <S>                   <C>
                                By Letter, continued Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                                                     P.O. Box 983, Jersey City, NJ 07303. If you hold share
                                                     certificates, you must return the certificates, along with
                                                     the letter and any required additional documentation.
                                                     ------------------------------------------------------------
                                                     A check will be mailed to the name(s) and address in which
                                                     the account is registered, or otherwise according to your
                                                     instructions.
                               ----------------------------------------------------------------------------------
                                Systematic           If your investment in all of the Morgan Stanley Dean Witter
                                Withdrawal Plan      Family of Funds has a total market value of at least
                                [ICON]               $10,000, you may elect to withdraw amounts of $25 or more,
                                                     or in any whole percentage of a Fund's balance (provided the
                                                     amount is at least $25), on a monthly, quarterly,
                                                     semi-annual or annual basis, from any Fund with a balance of
                                                     at least $1,000. Each time you add a Fund to the plan, you
                                                     must meet the plan requirements.
                                                     ------------------------------------------------------------
                                                     Amounts withdrawn are subject to any applicable CDSC. A CDSC
                                                     may be waived under certain circumstances. See the Class B
                                                     waiver categories listed in the "Share Class Arrangements"
                                                     section of this PROSPECTUS.
                                                     ------------------------------------------------------------
                                                     To sign up for the Systematic Withdrawal Plan, contact your
                                                     Morgan Stanley Dean Witter Financial Advisor or call
                                                     (800) 869-NEWS. You may terminate or suspend your plan at
                                                     any time. Please remember that withdrawals from the plan are
                                                     sales of shares, not Fund "distributions," and ultimately
                                                     may exhaust your account balance. The Fund may terminate or
                                                     revise the plan at any time.
                               ----------------------------------------------------------------------------------
</TABLE>

                    PAYMENT FOR SOLD SHARES. After we receive your complete
                    instructions to sell as described above, a check will be
                    mailed to you within seven days, although we will attempt to
                    make payment within one business day. Payment may also be
                    sent to your brokerage account.

                    Payment may be postponed or the right to sell your shares
                    suspended under unusual circumstances. If you request to
                    sell shares that were recently purchased by check your sale
                    will not be effected until it has been verified that the
                    check has been honored.

                    TAX CONSIDERATIONS. Normally, your sale of Fund shares is
                    subject to federal and state income tax. You should review
                    the "Tax Consequences" section of this PROSPECTUS and
                    consult your own tax professional about the tax consequences
                    of a sale.

                    REINSTATEMENT PRIVILEGE. If you sell Fund shares and have
                    not previously exercised the reinstatement privilege, you
                    may, within 35 days after the date of sale, invest any
                    portion of the proceeds in the same Class of Fund shares at
                    their net asset value and receive a pro rata credit for any
                    CDSC paid in connection with the sale.

                    INVOLUNTARY SALES. The Fund reserves the right, on sixty
                    days' notice, to sell the shares of any shareholder (other
                    than shares held in an IRA or 403(b) Custodial Account)
                    whose shares, due to sales by the shareholder, have a value
                    below $100, or in the case of an account opened through
                    EASYINVEST -SM-, if after 12 months the shareholder has
                    invested less than $1,000 in the account.

                    However, before the Fund sells your shares in this manner,
                    we will notify you and allow you sixty days to make an
                    additional investment in an amount that will increase the
                    value of your account to at least the required amount before
                    the sale is processed. No CDSC will be imposed on any
                    involuntary sale.

                                                                              11
<PAGE>
[Sidebar]
TARGETED DIVIDENDS-SM-
You may select to have your Fund distributions automatically invested in other
Classes of Fund shares or Classes of another Morgan Stanley Dean Witter Fund
that you own. Contact your Morgan Stanley Dean Witter Financial Advisor for
further information about this service.
[End Sidebar]
                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the sale of such
                    shares.

[ICON]              DISTRIBUTIONS
- --------------------------------------------------------------------------------
                    The Fund passes substantially all of its earnings from
                    income and capital gains along to its investors as
                    "distributions." The Fund earns income from stocks and
                    interest from fixed-income investments. These amounts are
                    passed along to Fund shareholders as "income dividend
                    distributions." The Fund realizes capital gains whenever it
                    sells securities for a higher price than it paid for them.
                    These amounts may be passed along as "capital gain
                    distributions."

                    The Fund declares income dividends separately for each
                    Class. Distributions paid on Class A and Class D shares
                    usually will be higher than for Class B and Class C because
                    distribution fees that Class B and Class C pay are higher.
                    Normally, income dividends are distributed to shareholders
                    semi-annually. Capital gains, if any, are usually
                    distributed in June and December. The Fund, however, may
                    retain and reinvest any long-term capital gains. The Fund
                    may at times make payments from sources other than income or
                    capital gains that represent a return of a portion of your
                    investment.

                    Distributions are reinvested automatically in additional
                    shares of the same Class and automatically credited to your
                    account, unless you request in writing that all
                    distributions be paid in cash. If you elect the cash option,
                    the Fund will mail a check to you no later than seven
                    business days after the distribution is declared. No
                    interest will accrue on uncashed checks. If you wish to
                    change how your distributions are paid, your request should
                    be received by the Fund's transfer agent, Morgan Stanley
                    Dean Witter Trust FSB, at least five business days prior to
                    the record date of the distributions.

[ICON]              TAX CONSEQUENCES
- --------------------------------------------------------------------------------
                    As with any investment, you should consider how your Fund
                    investment will be taxed. The tax information in this
                    PROSPECTUS is provided as general information. You should
                    consult your own tax professional about the tax consequences
                    of an investment in the Fund.

                    Unless your investment in the Fund is through a tax-deferred
                    retirement account, such as a 401(k) plan or IRA, you need
                    to be aware of the possible tax consequences when:

                    - The Fund makes distributions; and

                    - You sell Fund shares, including an exchange to another
                      Morgan Stanley Dean Witter Fund.

                    TAXES ON DISTRIBUTIONS. Your distributions are normally
                    subject to federal and state income tax when they are paid,
                    whether you take them in cash or reinvest them in Fund
                    shares. A distribution also may be subject to local income
                    tax. Any income dividend distributions and any short-term
                    capital gain distributions are

 12
<PAGE>
                    taxable to you as ordinary income. Any long-term capital
                    gain distributions are taxable to you as long-term capital
                    gains, no matter how long you have owned shares in the Fund.

                    If more than 50% of the Fund's assets are invested in
                    foreign securities at the end of any fiscal year, the Fund
                    may elect to permit shareholders to take a credit or
                    deduction on their federal income tax return for foreign
                    taxes paid by the Fund.

                    Every January, you will be sent a statement (IRS
                    Form 1099-DIV) showing the taxable distributions paid to you
                    in the previous year. The statement provides information on
                    your dividends and capital gains for tax purposes.

                    TAXES ON SALES. Your sale of Fund shares normally is subject
                    to federal and state income tax and may result in a taxable
                    gain or loss to you. A sale also may be subject to local
                    income tax. Your exchange of Fund shares for shares of
                    another Morgan Stanley Dean Witter Fund is treated for tax
                    purposes like a sale of your original shares and a purchase
                    of your new shares. Thus, the exchange may, like a sale,
                    result in a taxable gain or loss to you and will give you a
                    new tax basis for your new shares.

                    When you open your Fund account, you should provide your
                    social security or tax identification number on your
                    investment application. By providing this information, you
                    will avoid being subject to a federal backup withholding tax
                    of 31% on taxable distributions and redemption proceeds. Any
                    withheld amount would be sent to the IRS as an advance tax
                    payment.

[ICON]              SHARE CLASS ARRANGEMENTS
- --------------------------------------------------------------------------------
                    The Fund offers several Classes of shares having different
                    distribution arrangements designed to provide you with
                    different purchase options according to your investment
                    needs. Your Morgan Stanley Dean Witter Financial Advisor or
                    other authorized financial representative can help you
                    decide which Class may be appropriate for you.

                    The general public is offered three Classes: Class A shares,
                    Class B shares and Class C shares, which differ principally
                    in terms of sales charges and ongoing expenses. A fourth
                    Class, Class D shares, is offered only to a limited category
                    of investors. Shares that you acquire through reinvested
                    distributions will not be subject to any front-end sales
                    charge or CDSC -- contingent deferred sales charge. Sales
                    personnel may receive different compensation for selling
                    each Class of shares. The sales charges applicable to each
                    Class provide for the distribution financing of shares of
                    that Class.

                                                                              13
<PAGE>
[Sidebar]
FRONT-END SALES
CHARGE OR FSC
An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges - the Combined Purchase Privilege, Right of Accumulation
and Letter of Intent.
[End Sidebar]

                    The chart below compares the sales charge and maximum annual
                    12b-1 fee applicable to each Class:

<TABLE>
<CAPTION>
                                                                                                           MAXIMUM ANNUAL 12b-1
                               CLASS                      SALES CHARGE                                              FEE
                               <S>                        <C>                                           <C>
                               ----------------------------------------------------------------------------------------------------
                                A                         Maximum 5.25% initial sales charge
                                                          reduced for purchase of $25,000 or more;
                                                          shares sold without an initial sales
                                                          charge are generally subject to a 1.0%
                                                          CDSC during the first year                               0.25%
                               ----------------------------------------------------------------------------------------------------
                                B                         Maximum 5.0% CDSC during the first year
                                                          decreasing to 0% after six years                         1.0%
                               ----------------------------------------------------------------------------------------------------
                                C                         1.0% CDSC during the first year                          1.0%
                               ----------------------------------------------------------------------------------------------------
                                D                         None                                                  None
                               ----------------------------------------------------------------------------------------------------
</TABLE>

                     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 purchases of $25,000 or more
                    according to the schedule below. Investments of $1 million
                    or more are not subject to an initial sales charge, but are
                    generally subject to a contingent deferred sales charge, or
                    CDSC, of 1.0% on sales made within one year after the last
                    day of the month of purchase. The CDSC will be assessed in
                    the same manner and with the same CDSC waivers as with
                    Class B shares. Class A shares are also subject to a
                    distribution (12b-1) fee of up to 0.25% of the average daily
                    net assets of the Class.

                    The offering price of Class A shares includes a sales charge
                    (expressed as a percentage of the offering price) on a
                    single transaction as shown in the following table:

<TABLE>
<CAPTION>
                                                                                  FRONT-END SALES CHARGE
                                                                  ------------------------------------------------------
                               AMOUNT OF SINGLE                       PERCENTAGE OF           APPROXIMATE PERCENTAGE OF
                               TRANSACTION                        PUBLIC OFFERING PRICE          NET 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>

                    The reduced sales charge schedule is applicable to purchases
                    of Class A shares in a single transaction by:

                    - A single account (including an individual, trust or
                      fiduciary account).

                    - Family member accounts (limited to husband, wife and
                      children under the age of 21).

                    - Pension, profit sharing or other employee benefit plans of
                      companies and their affiliates.

 14
<PAGE>
                    - Tax-exempt organizations.

                    - Groups organized for a purpose other than to buy mutual
                      fund shares.

                    COMBINED PURCHASE PRIVILEGE. You also will have the benefit
                    of reduced sales charges by combining purchases of Class A
                    shares of the Fund in a single transaction with purchases of
                    Class A shares of other Multi-Class Funds and shares of FSC
                    Funds.

                    RIGHT OF ACCUMULATION. You also may benefit from a reduction
                    of sales charges if the cumulative net asset value of
                    Class A shares of the Fund purchased in a single
                    transaction, together with shares of other Funds you
                    currently own which were previously purchased at a price
                    including a front-end sales charge (including shares
                    acquired through reinvestment of distributions), amounts to
                    $25,000 or more. Also, if you have a cumulative net asset
                    value of all your Class A and Class D shares equal to at
                    least $5 million (or $25 million for certain employee
                    benefit plans), you are eligible to purchase Class D shares
                    of any Fund subject to the Fund's minimum initial investment
                    requirement.

                    You must notify your Morgan Stanley Dean Witter Financial
                    Advisor or other authorized financial representative (or
                    Morgan Stanley Dean Witter Trust FSB if you purchase
                    directly through the Fund), 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 when an order is placed by mail. The
                    reduced sales charge will not be granted if:
                    (i) notification is not furnished at the time of the order;
                    or (ii) a review of the records of Dean Witter Reynolds or
                    other authorized dealer of Fund shares or the Fund's
                    transfer agent does not confirm your represented holdings.

                    LETTER OF INTENT. The schedule of reduced sales charges for
                    larger purchases also will be available to you if you enter
                    into a written "letter of intent." A letter of intent
                    provides for the purchase of Class A shares of the Fund or
                    other Multi-Class Funds or shares of FSC Funds within a
                    thirteen month period. The initial purchase under a letter
                    of intent must be at least 5% of the stated investment goal.
                    To determine the applicable sales charge reduction, you may
                    also include: (1) the cost of shares of other Morgan Stanley
                    Dean Witter Funds which were previously purchased at a price
                    including a front-end sales charge during the 90-day period
                    prior to the distributor receiving the letter of intent, and
                    (2) the cost of shares of other Funds you currently own
                    acquired in exchange for shares of Funds purchased during
                    that period at a price including a front-end sales charge.
                    You can obtain a letter of intent by contacting your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative, or by calling (800) 869-NEWS. If
                    you do not achieve the stated investment goal within the
                    thirteen-month period, you are required to pay the
                    difference between the sales charges otherwise applicable
                    and sales charges actually paid, which may be deducted from
                    your investment.

                                                                              15
<PAGE>
                    OTHER SALES CHARGE WAIVERS. In addition to investments of
                    $1 million or more, your purchase of Class A shares is not
                    subject to a front-end sales charge (or a CDSC upon sale) if
                    your account qualifies under one of the following
                    categories:

                    - A trust for which Morgan Stanley Dean Witter Trust FSB
                      provides discretionary trustee services.

                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      termination fees, mandatory sale or transfer restrictions
                      on termination) approved by the Fund's distributor
                      pursuant to which they pay an asset-based fee for
                      investment advisory, administrative and/or brokerage
                      services.

                    - Employer-sponsored employee benefit plans, whether or not
                      qualified under the Internal Revenue Code, for which
                      Morgan Stanley Dean Witter Trust FSB serves as trustee or
                      Dean Witter Reynolds' Retirement Plan Services serves as
                      recordkeeper under a written Recordkeeping Services
                      Agreement ("MSDW Eligible Plans") which have at least 200
                      eligible employees.

                    - An MSDW Eligible Plan whose Class B shares have converted
                      to Class A shares, regardless of the plan's asset size or
                      number of eligible employees.

                    - A client of a Morgan Stanley Dean Witter Financial Advisor
                      who joined us from another investment firm within six
                      months prior to the date of purchase of Fund shares, and
                      you used the proceeds from the sale of shares of a
                      proprietary mutual fund of that Financial Advisor's
                      previous firm that imposed either a front-end or deferred
                      sales charge to purchase Class A shares, provided that:
                      (1) you sold the shares not more than 60 days prior to the
                      purchase of Fund shares, and (2) the sale proceeds were
                      maintained in the interim in cash or a money market fund.

                    - Current or retired Directors/Trustees of the Morgan
                      Stanley Dean Witter Funds, such persons' spouses and
                      children under the age of 21, and trust accounts for which
                      any of such persons is a beneficiary.

                    - Current or retired directors, officers and employees of
                      Morgan Stanley Dean Witter & Co. and any of its
                      subsidiaries, such persons' spouses and children under the
                      age of 21, and trust accounts for which any of such
                      persons is a beneficiary.

 16
<PAGE>
[Sidebar]
CONTINGENT DEFERRED SALES CHARGE OR CDSC
A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.
[End Sidebar]

                     CLASS B SHARES  Class B shares are offered at net asset
                    value with no initial sales charge but are subject to a
                    contingent deferred sales charge, or CDSC, as set forth in
                    the table below. For the purpose of calculating the CDSC,
                    shares are deemed to have been purchased on the last day of
                    the month during which they were purchased.

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

                    Each time you place an order to sell or exchange shares,
                    shares with no CDSC will be sold or exchanged first, then
                    shares with the lowest CDSC will be sold or exchanged next.
                    For any shares subject to a CDSC, the CDSC will be assessed
                    on an amount equal to the lesser of the current market value
                    or the cost of the shares being sold.
                    CDSC WAIVERS. A CDSC, if otherwise applicable, will be
                    waived in the case of:
                    - Sales of shares held at the time you die or become
                      disabled (within the definition in Section 72(m)(7) of the
                      Internal Revenue Code which relates to the ability to
                      engage in gainful employment), if the shares are:
                      (i) registered either in your name (not a trust) or in the
                      names of you and your spouse as joint tenants with right
                      of survivorship; or (ii) held in a qualified corporate or
                      self-employed retirement plan, IRA or 403(b) Custodial
                      Account, provided in either case that the sale is
                      requested within one year of your death or initial
                      determination of disability.
                    - Sales in connection with the following retirement plan
                      "distributions": (i) 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); (ii) distributions from an IRA or
                      403(b) Custodial Account following attainment of age
                      59 1/2; or (iii) a tax-free return of an excess IRA
                      contribution (a "distribution" does not include a direct
                      transfer of IRA, 403(b) Custodial Account or retirement
                      plan assets to a successor custodian or trustee).
                    - Sales of shares held for you as a participant in an MSDW
                      Eligible Plan.

                    - Sales of shares in connection with the Systematic
                      Withdrawal Plan of up to 12% annually of the value of each
                      Fund from which plan sales are made. The percentage is
                      determined on the date you establish the Systematic
                      Withdrawal Plan and based on the next calculated share
                      price. You may have this CDSC waiver applied in amounts up
                      to 1% per month, 3% per quarter, 6% semi-annually or 12%
                      annually. Shares with no CDSC will be sold first, followed
                      by those with the lowest CDSC. As such, the waiver benefit
                      will be reduced by the amount of your

                                                                              17
<PAGE>
                      shares that are not subject to a CDSC. If you suspend your
                      participation in the plan, you may later resume plan
                      payments without requiring a new determination of the
                      account value for the 12% CDSC waiver.
                    - Sales of shares if you simultaneously invest the proceeds
                      in the Investment Manager's mutual fund asset allocation
                      program, pursuant to which investors pay an asset-based
                      fee. Any shares you acquire in connection with the
                      Investment Manager's mutual fund asset allocation program
                      are subject to all of the terms and conditions of that
                      program, including termination fees, mandatory sale or
                      transfer restrictions on termination.
                    All waivers will be granted only following the Fund's
                    distributor receiving confirmation of your entitlement. If
                    you believe you are eligible for a CDSC waiver, please
                    contact your Financial Advisor or call (800) 869-NEWS.
                    DISTRIBUTION FEE. Class B shares are subject to an annual
                    12b-1 fee of 1.0% of the lesser of: (a) the average daily
                    aggregate gross purchases by all shareholders of the Fund's
                    Class B shares since the inception of the 12b-1 plan on
                    July 2, 1984 (not including reinvestments of dividends or
                    capital gains distributions), less the average daily
                    aggregate net asset value of the Fund's Class B shares sold
                    by all shareholders since the 12b-1 plan's inception upon
                    which a CDSC has been imposed or waived, or (b) the average
                    daily net assets of Class B shares attributable to shares
                    purchased, net of related shares sold, since inception of
                    the 12b-1 plan.
                    CONVERSION FEATURE. After ten (10) years, Class B shares
                    will convert automatically to Class A shares of the Fund
                    with no initial sales charge. The ten year period runs 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, from the last day of the month in which the
                    original Class B shares were purchased; the shares will
                    convert to Class A shares based on their relative net asset
                    values in the month following the ten year period. At the
                    same time, an equal proportion of Class B shares acquired
                    through automatically reinvested distributions will convert
                    to Class A shares on the same basis. (Class B shares held
                    before May 1, 1997, however, will convert to Class A shares
                    in May 2007.)
                    In the case of Class B shares held in an MSDW Eligible Plan,
                    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 Class B shares of a Morgan Stanley Dean Witter Fund
                    purchased by that plan.
                    Currently, the Class B share conversion is not a taxable
                    event; the conversion feature may be cancelled if it is
                    deemed a taxable event in the future by the Internal Revenue
                    Service.

                    If you exchange your Class B shares for shares of a Money
                    Market Fund, a No-Load Fund, North American Government
                    Income Trust or Short-Term U.S. Treasury Trust, the holding
                    period for conversion is frozen as of the last day of the
                    month of the exchange and resumes on the last day of the
                    month you exchange back into Class B shares.

 18
<PAGE>
                    EXCHANGING SHARES SUBJECT TO A CDSC. There are special
                    considerations when you exchange Fund shares that are
                    subject to a CDSC. When determining the length of time you
                    held the shares and the corresponding CDSC rate, any period
                    (starting at the end of the month) during which you held
                    shares of a fund that does NOT charge a CDSC WILL NOT BE
                    COUNTED. Thus, in effect the "holding period" for purposes
                    of calculating the CDSC is frozen upon exchanging into a
                    fund that does not charge a CDSC.
                    For example, if you held Class B shares of the Fund in a
                    regular account for one year, exchanged to Class B of
                    another Morgan Stanley Dean Witter Multi-Class Fund for
                    another year, then sold your shares, a CDSC rate of 4% would
                    be imposed on the shares based on a two year holding
                    period -- one year for each Fund. However, if you had
                    exchanged the shares of the Fund for a Money Market Fund
                    (which does not charge a CDSC) instead of the Multi-Class
                    Fund, then sold your shares, a CDSC rate of 5% would be
                    imposed on the shares based on a one year holding period.
                    The one year in the Money Market Fund would not be counted.
                    Nevertheless, if shares subject to a CDSC are exchanged for
                    a Fund that does not charge a CDSC, you will receive a
                    credit when you sell the shares equal to the distribution
                    (12b-1) fees, if any, you paid on those shares while in that
                    Fund up to the amount of any applicable CDSC.
                    In addition, shares that are exchanged into or from a Morgan
                    Stanley Dean Witter Fund subject to a higher CDSC rate will
                    be subject to the higher rate, even if the shares are
                    re-exchanged into a Fund with a lower CDSC rate.

                     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 sales made within one year after the last day of the
                    month of purchase. The CDSC will be assessed in the same
                    manner and with the same CDSC waivers as with Class B
                    shares.
                    DISTRIBUTION FEE. Class C shares are subject to an annual
                    distribution (12b-1) fee of up to 1.0% of the average daily
                    net assets of that Class. 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. Unlike
                    Class B shares, Class C shares have no conversion feature
                    and, accordingly, an investor that purchases Class C shares
                    may be subject to distribution (12b-1) fees applicable to
                    Class C shares for an indefinite period.

                     CLASS D SHARES  Class D shares are offered without any
                    sales charge on purchases or sales and without any
                    distribution (12b-1) fee. Class D shares are offered only to
                    investors meeting an initial investment minimum of
                    $5 million ($25 million for MSDW Eligible Plans) and the
                    following investor categories:

                    - Investors participating in the Investment Manager's mutual
                      fund asset allocation program (subject to all of its terms
                      and conditions, including termination fees, mandatory sale
                      or transfer restrictions on termination) pursuant to which
                      they pay an asset-based fee.

                                                                              19
<PAGE>
                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      termination fees, mandatory sale or transfer restrictions
                      on termination) approved by the Fund's distributor
                      pursuant to which they pay an asset-based fee for
                      investment advisory, administrative and/or brokerage
                      services.
                    - Employee benefit plans maintained by Morgan Stanley Dean
                      Witter & Co. or any of its subsidiaries for the benefit of
                      certain employees of Morgan Stanley Dean Witter & Co. and
                      its subsidiaries.
                    - Certain unit investment trusts sponsored by Dean Witter
                      Reynolds.
                    - Certain other open-end investment companies whose shares
                      are distributed by the Fund's distributor.
                    - Investors who were shareholders of the Dean Witter
                      Retirement Series on September 11, 1998 for additional
                      purchases for their former Dean Witter Retirement
                      Series accounts.
                    MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the
                    $5 million ($25 million for MSDW Eligible Plans) initial
                    investment to qualify to purchase Class D shares you may
                    combine: (1) purchases in a single transaction of Class D
                    shares of the Fund and other Morgan Stanley Dean Witter
                    Multi-Class Funds and/or (2) previous purchases of Class A
                    and Class D shares of Multi-Class Funds and shares of FSC
                    Funds you currently own, along with shares of Morgan Stanley
                    Dean Witter Funds you currently own that you acquired in
                    exchange for those shares.

                     NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS  If you
                    receive a cash payment representing an income dividend or
                    capital gain and you reinvest that amount in the applicable
                    Class of shares by returning the check within 30 days of the
                    payment date, the purchased shares would not be subject to
                    an initial sales charge or CDSC.

                     PLAN OF DISTRIBUTION (RULE 12B-1 FEES)  The Fund has
                    adopted a Plan of Distribution in accordance with
                    Rule 12b-1 under the Investment Company Act of 1940 with
                    respect to the distribution of Class A, Class B and Class C
                    shares. The Plan allows the Fund to pay distribution fees
                    for the sale and distribution of these shares. It also
                    allows the Fund to pay for services to shareholders of
                    Class A, Class B and Class C shares. Because these fees are
                    paid out of the Fund's assets on an ongoing basis, over time
                    these fees will increase the cost of your investment in
                    these Classes and may cost you more than paying other types
                    of sales charges.

 20
<PAGE>
FINANCIAL HIGHLIGHTS

        The financial highlights table is intended to help you understand the
        Fund's financial performance for the past 5 fiscal years of the Fund.
        Certain information reflects financial results for a single Fund share
        throughout each year. The total returns in the table represent the rate
        an investor would have earned or lost on an investment in the Fund
        (assuming reinvestment of all dividends and distributions).

        This information has been audited by PricewaterhouseCoopers LLP,
        independent accountants, whose report, along with the Fund's financial
        statements, is included in the annual report, which is available upon
        request.

<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED    FOR THE YEAR ENDED    FOR THE PERIOD JULY 28, 1997*
                                                       FEBRUARY 29, 2000     FEBRUARY 28, 1999       THROUGH FEBRUARY 28, 1998
            <S>                                        <C>                   <C>                   <C>
            --------------------------------------------------------------------------------------------------------------------
             CLASS A SHARES++
            --------------------------------------------------------------------------------------------------------------------

             SELECTED PER SHARE DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, beginning of period            $10.15                $13.87                     $14.44
            --------------------------------------------------------------------------------------------------------------------
             INCOME (LOSS) FROM INVESTMENT
            OPERATIONS:
                Net investment income                          0.10                  0.03                       0.04
                Net realized and unrealized gain
                (loss)                                         2.69                 (3.61)                     (0.10)
                                                             ------                ------                     ------
             Total income (loss) from investment
               operations                                      2.79                 (3.58)                     (0.06)
            --------------------------------------------------------------------------------------------------------------------

             Less distributions from net realized
             gain                                                --                 (0.14)                     (0.51)
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, end of period                  $12.94                $10.15                     $13.87
            --------------------------------------------------------------------------------------------------------------------

             TOTAL RETURN+                                    27.49%               (26.04)%                    (0.22)%(1)
            --------------------------------------------------------------------------------------------------------------------

             RATIOS TO AVERAGE NET ASSETS:
            --------------------------------------------------------------------------------------------------------------------
             Expenses                                          1.12%(3)              1.14%(3)                   1.11%(2)
            --------------------------------------------------------------------------------------------------------------------
             Net investment income                             0.75%(3)              0.56%(3)                   0.45%(2)
            --------------------------------------------------------------------------------------------------------------------

             SUPPLEMENTAL DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net assets, end of period, in
             thousands                                       $1,233                  $691                       $309
            --------------------------------------------------------------------------------------------------------------------
             Portfolio turnover rate                             39%                   26%                        67%(1)
            --------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
* 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.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
</TABLE>

                                                                              21
<PAGE>

<TABLE>
<CAPTION>
            FOR THE YEAR ENDED FEBRUARY 28               2000**++       1999++       1998*++         1997         1996**
            <S>                                          <C>           <C>           <C>           <C>           <C>
            -------------------------------------------------------------------------------------------------------------

             CLASS B SHARES
            -------------------------------------------------------------------------------------------------------------

             SELECTED PER SHARE DATA:
            -------------------------------------------------------------------------------------------------------------
             Net asset value, beginning of period          $10.03        $13.81        $13.34        $12.70        $10.77
            -------------------------------------------------------------------------------------------------------------
             INCOME (LOSS) FROM INVESTMENT
            OPERATIONS:
                Net investment income (loss)                   --         (0.04)        (0.02)           --          0.06
                Net realized and unrealized gain
                (loss)                                       2.64         (3.60)         2.18          2.66          2.53
                                                         --------      --------      --------      --------      --------
             Total income (loss) from investment
               operations                                    2.64         (3.64)         2.16          2.66          2.59
            -------------------------------------------------------------------------------------------------------------
             LESS DIVIDENDS AND DISTRIBUTIONS FROM:
                Net investment income                          --            --         (0.01)        (0.02)        (0.04)
                Net realized gain                              --         (0.14)        (1.68)        (2.00)        (0.62)
                                                         --------      --------      --------      --------      --------
             Total dividends and distributions                 --         (0.14)        (1.69)        (2.02)        (0.66)
            -------------------------------------------------------------------------------------------------------------
             Net asset value, end of period                $12.67        $10.03        $13.81        $13.34        $12.70
            -------------------------------------------------------------------------------------------------------------

             TOTAL RETURN+                                  26.32%       (26.60)%       16.93%        20.88%        24.32%
            -------------------------------------------------------------------------------------------------------------

             RATIOS TO AVERAGE NET ASSETS:
            -------------------------------------------------------------------------------------------------------------
             Expenses                                        1.89%(1)      1.90%(1)      1.80%         1.84%         1.90%
            -------------------------------------------------------------------------------------------------------------
             Net investment income (loss)                   (0.02)%(1)    (0.20)%(1)    (0.15)%        0.05%         0.52%
            -------------------------------------------------------------------------------------------------------------

             SUPPLEMENTAL DATA:
            -------------------------------------------------------------------------------------------------------------
             Net assets, end of period, in
             thousands                                   $189,180      $147,527      $273,333      $247,989      $152,661
            -------------------------------------------------------------------------------------------------------------
             Portfolio turnover rate                           39%           26%           67%          156%           49%
            -------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
* Prior to July 28, 1997, the Fund issued one class of shares. All shares of the
  Fund held prior to that date, other than shares which were purchased prior to
  July 2, 1984 (and with respect to such shares, certain shares acquired through
  reinvestment of dividends and capital gains distributions (collectively the "Old
  Shares")), have been designated Class B shares. The Old Shares have been
  designated Class D shares.
** Year ended February 29.
++ 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) Reflects overall Fund ratios for investment income and non-class specific
expenses.
</TABLE>

 22
<PAGE>

<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED    FOR THE YEAR ENDED    FOR THE PERIOD JULY 28, 1997*
                                                       FEBRUARY 29, 2000     FEBRUARY 28, 1999       THROUGH FEBRUARY 28, 1998
            <S>                                        <C>                   <C>                   <C>
            --------------------------------------------------------------------------------------------------------------------
             CLASS C SHARES++
            --------------------------------------------------------------------------------------------------------------------

             SELECTED PER SHARE DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, beginning of period            $10.02                $13.81                     $14.44
            --------------------------------------------------------------------------------------------------------------------
             INCOME (LOSS) FROM INVESTMENT
            OPERATIONS:
                Net investment income (loss)                   0.01                 (0.02)                     (0.02)
                Net realized and unrealized gain
                (loss)                                         2.63                 (3.63)                     (0.10)
                                                             ------                ------                     ------
             Total income (loss) from investment
               operations                                      2.64                 (3.65)                     (0.12)
            --------------------------------------------------------------------------------------------------------------------

             Less distributions from net realized
             gain                                                --                 (0.14)                     (0.51)
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, end of period                  $12.66                $10.02                     $13.81
            --------------------------------------------------------------------------------------------------------------------

             TOTAL RETURN+                                    26.35%               (26.67)%                    (0.64)%(1)
            --------------------------------------------------------------------------------------------------------------------

             RATIOS TO AVERAGE NET ASSETS:
            --------------------------------------------------------------------------------------------------------------------
             Expenses                                          1.89%(3)              1.90%(3)                   1.87%(2)
            --------------------------------------------------------------------------------------------------------------------
             Net investment loss                              (0.02)%(3)            (0.20)%(3)                 (0.23)%(2)
            --------------------------------------------------------------------------------------------------------------------

             SUPPLEMENTAL DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net assets, end of period, in
             thousands                                       $3,161                $1,278                     $1,488
            --------------------------------------------------------------------------------------------------------------------
             Portfolio turnover rate                             39%                   26%                        67%(1)
            --------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
* 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.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
</TABLE>

                                                                              23
<PAGE>

<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED    FOR THE YEAR ENDED    FOR THE PERIOD JULY 28, 1997*
                                                       FEBRUARY 29, 2000     FEBRUARY 28, 1999       THROUGH FEBRUARY 28, 1998
            <S>                                        <C>                   <C>                   <C>
            --------------------------------------------------------------------------------------------------------------------
             CLASS D SHARES++
            --------------------------------------------------------------------------------------------------------------------

             SELECTED PER SHARE DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, beginning of period             $10.19               $13.89                     $14.44
            --------------------------------------------------------------------------------------------------------------------
             INCOME (LOSS) FROM INVESTMENT
            OPERATIONS:
                Net investment income                           0.12                 0.05                       0.07
                Net realized and unrealized gain
                (loss)                                          2.70                (3.61)                     (0.11)
                                                             -------               ------                     ------
             Total income (loss) from investment
               operations                                       2.82                (3.56)                     (0.04)
            --------------------------------------------------------------------------------------------------------------------

             Less distributions from net realized
             gain                                                 --                (0.14)                     (0.51)
            --------------------------------------------------------------------------------------------------------------------
             Net asset value, end of period                   $13.01               $10.19                     $13.89
            --------------------------------------------------------------------------------------------------------------------

             TOTAL RETURN+                                     27.67%              (25.86)%                    (0.08)%(1)
            --------------------------------------------------------------------------------------------------------------------

             RATIOS TO AVERAGE NET ASSETS:
            --------------------------------------------------------------------------------------------------------------------
             Expenses                                           0.89%(3)             0.90%(3)                   0.84%(2)
            --------------------------------------------------------------------------------------------------------------------
             Net investment income                              0.98%(3)             0.80%(3)                   0.82%(2)
            --------------------------------------------------------------------------------------------------------------------

             SUPPLEMENTAL DATA:
            --------------------------------------------------------------------------------------------------------------------
             Net assets, end of period, in
             thousands                                       $32,356              $15,454                    $13,161
            --------------------------------------------------------------------------------------------------------------------
             Portfolio turnover rate                              39%                  26%                        67%(1)
            --------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                     <C>
* The date shares were first issued. Shareholders who held shares of the Fund prior
  to July 28, 1997 (the date the Fund converted to a multiple class share structure)
  should refer to the Financial Highlights of Class B to obtain the historical per
  share data and ratio information of their shares.
++ The per share amounts were computed using an average number of shares outstanding
during the period.
+ Calculated based on the net asset value as of the last business day of the period.
(1) Not annualized.
(2) Annualized.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
</TABLE>

 24
<PAGE>
NOTES

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                                                                              25
<PAGE>
NOTES

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 26
<PAGE>
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS
        The Morgan Stanley Dean Witter Family of Funds offers investors a wide
        range of investment choices. Come on in and meet the family!
- --------------------------------------------------------------------------------
 GROWTH FUNDS
- --------------------------------
GROWTH FUNDS
Aggressive Equity Fund
American Opportunities Fund
Capital Growth Securities
Developing Growth Securities
Growth Fund
Market Leader Trust
Mid-Cap Equity Trust
Next Generation Trust
Small Cap Growth Fund
Special Value Fund
Tax-Managed Growth Fund
21st Century Trend Fund
THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities
GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas"
 Portfolio
European Growth Fund
Fund of Funds - International Portfolio
International Fund
International SmallCap Fund
Japan Fund
Latin American Growth Fund
Pacific Growth Fund
- --------------------------------------------------------------------------------
 GROWTH AND INCOME FUNDS
- --------------------------------
Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Equity Fund
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Total Market Index Fund
Total Return Trust
Value Fund
Value-Added Market Series/Equity Portfolio
THEME FUNDS
Real Estate Fund
Utilities Fund
GLOBAL FUNDS
Global Dividend Growth Securities
Global Utilities Fund
- --------------------------------------------------------------------------------
 INCOME FUNDS
- --------------------------------
GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust
DIVERSIFIED INCOME FUNDS
Diversified Income Trust
CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund (NL)
GLOBAL INCOME FUNDS
North American Government Income Trust
World Wide Income Trust
TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust (FSC)
Limited Term Municipal Trust (NL)
Multi-State Municipal Series Trust (FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
- --------------------------------------------------------------------------------
 MONEY MARKET FUNDS
- --------------------------------
TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund (MM)
U.S. Government Money Market Trust (MM)
TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust (MM)
New York Municipal Money Market Trust (MM)
Tax-Free Daily Income Trust (MM)

There may be Funds created after this PROSPECTUS was published. Please consult
the inside back cover of a new fund's prospectus for its designation, e.g.,
Multi-Class Fund or Money Market Fund.

Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
North American Government Income Trust and Short-Term U.S. Treasury Trust, is a
Multi-Class Fund. A Multi-Class Fund is a mutual fund offering multiple Classes
of shares. The other types of funds are: NL - No-Load (Mutual) Fund; MM - Money
Market Fund; FSC - A mutual fund sold with a front-end sales charge and a
distribution (12b-1) fee.
<PAGE>
MORGAN STANLEY DEAN WITTER
NATURAL RESOURCE DEVELOPMENT SECURITIES

[Sidebar]
TICKER SYMBOLS:

Class A:  NREAX
- -------------------
Class B:  NREBX
- -------------------
Class C:  NRECX
- -------------------
Class D:  NREDX
- -------------------
[End Sidebar]

                    Additional information about the Fund's investments is
                    available in the Fund's ANNUAL and SEMI-ANNUAL REPORTS TO
                    SHAREHOLDERS. In the Fund's ANNUAL REPORT, you will find a
                    discussion of the market conditions and investment
                    strategies that significantly affected the Fund's
                    performance during its last fiscal year. The Fund's
                    Statement of Additional Information also provides additional
                    information about the Fund. The Statement of Additional
                    Information is incorporated herein by reference (legally is
                    part of this PROSPECTUS). For a free copy of any of these
                    documents, to request other information about the Fund, or
                    to make shareholder inquiries, please call:

                                           (800) 869-NEWS

                    You also may obtain information about the Fund by calling
                    your Morgan Stanley Dean Witter Financial Advisor or by
                    visiting our Internet site at:

                                   www.msdw.com/individual/funds

                    Information about the Fund (including the STATEMENT OF
                    ADDITIONAL INFORMATION) can be viewed and copied at the
                    Securities and Exchange Commission's Public Reference Room
                    in Washington, DC. Information about the Reference Room's
                    operations may be obtained by calling the SEC at
                    (202) 942-8090. Reports and other information about the Fund
                    are available on the EDGAR Database on the SEC's Internet
                    site (www.sec.gov) and copies of this information may be
                    obtained, after paying a duplicating fee, by electronic
                    request at the following email address: [email protected],
                    or by writing the Public Reference Section of the SEC,
                    Washington, DC 20549-0102.

(THE FUND'S INVESTMENT COMPANY ACT FILE NO. IS 811-3129)


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