VAN KAMPEN AMERICAN CAPITAL GLOBAL MANAGED ASSETS FUND
497, 1998-09-24
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<PAGE>   1
 
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                     VAN KAMPEN GLOBAL MANAGED ASSETS FUND
- --------------------------------------------------------------------------------
 
    Van Kampen Global Managed Assets Fund (the "Fund") is a non-diversified,
management investment company, commonly known as a mutual fund. The Fund's
investment objective is to seek to provide total return through a managed
balance of foreign and domestic equity and debt securities. There is no
assurance that the Fund will achieve its investment objective.
 
    The Fund's investment adviser is Van Kampen Asset Management Inc. (the
"Adviser"). Morgan Stanley Asset Management Inc. provides sub-advisory services
to the Adviser of the Fund (the "Subadviser"). This Prospectus sets forth
certain information that a prospective investor should know before investing in
the Fund. Please read it carefully and retain it for future reference. The
address of the Fund is One Parkview Plaza, Oakbrook Terrace, Illinois 60181 and
its telephone number is (800) 421-5666.
                            
                               ------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE REGULATORS NOR HAS THE SECURITIES AND EXCHANGE
COMMISSION OR ANY STATE REGULATORS PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                               ------------------
 
    SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY BANK OR DEPOSITORY INSTITUTION; FURTHER, SUCH SHARES ARE NOT
FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL
RESERVE BOARD OR ANY OTHER GOVERNMENT AGENCY. SHARES OF THE FUND INVOLVE
INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF PRINCIPAL.
 
    A Statement of Additional Information, dated April 30, 1998, containing
additional information about the Fund is hereby incorporated in its entirety
into this Prospectus. A copy of the Statement of Additional Information may be
obtained without charge by calling (800) 421-5666 or for Telecommunications
Device for the Deaf at (800) 421-2833. The Statement of Additional Information
has been filed with the Securities and Exchange Commission (the "SEC") and is
available along with other related materials at the SEC's internet web site
(http://www.sec.gov).
 



                               [VAN KAMPEN LOGO]
 
                    THIS PROSPECTUS IS DATED APRIL 30, 1998,
            AS SUPPLEMENTED ON JULY 14, 1998 AND SEPTEMBER 28, 1998.
<PAGE>   2
 
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                               TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Prospectus Summary..........................................    3
Shareholder Transaction Expenses............................    5
Annual Fund Operating Expenses and Example..................    6
Financial Highlights........................................    7
The Fund....................................................    8
Investment Objective and Policies...........................    8
Risk Factors................................................   10
Investment Practices........................................   11
Investment Advisory Services................................   15
Alternative Sales Arrangements..............................   18
Purchase of Shares..........................................   19
Shareholder Services........................................   25
Redemption of Shares........................................   28
Distribution and Service Plans..............................   30
Distributions from the Fund.................................   31
Tax Status..................................................   31
Fund Performance............................................   34
Description of Shares of the Fund...........................   35
Additional Information......................................   36
</TABLE>
 
  NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS, IN CONNECTION WITH THE OFFER CONTAINED IN THIS PROSPECTUS AND, IF
GIVEN OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON
AS HAVING BEEN AUTHORIZED BY THE FUND, THE ADVISER OR THE DISTRIBUTOR. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER BY THE FUND OR BY THE DISTRIBUTOR TO
SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE SECURITIES OFFERED HEREBY
IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL FOR THE FUND TO MAKE
SUCH AN OFFER IN SUCH JURISDICTION.
 
                                        2
<PAGE>   3
 
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                               PROSPECTUS SUMMARY
- --------------------------------------------------------------------------------
 
THE FUND. Van Kampen Global Managed Assets Fund (the "Fund") is a
non-diversified, open-end management investment company organized as a Delaware
business trust.
 
MINIMUM PURCHASE. $500 minimum initial investment for each class of shares and
$25 minimum for each subsequent investment for each class of shares (or less as
described under "Purchase of Shares").
 
INVESTMENT OBJECTIVE. The investment objective of the Fund is to seek to provide
total return through a managed balance of foreign and domestic equity and debt
securities. There is no assurance that the Fund will achieve its investment
objective. See "Investment Objective and Policies."
 
INVESTMENT POLICY. The Fund may, from time to time, be substantially invested in
foreign or domestic equity or debt securities based upon the Adviser's and
Subadviser's evaluation of economic and market trends and anticipated relative
return available from a particular type of security. The Fund will maintain at
least 25% of its total assets in debt securities.
 
  The Fund may sell (write) and purchase call and put options. The Fund may
purchase and sell futures contracts and options on such contracts only for bona
fide hedging purposes. The use of options, futures contracts and options on
futures contracts may include additional risks. The Fund may purchase or sell
debt securities and currencies on a forward commitment basis and may lend
portfolio securities. See "Investment Practices."
 
RISK FACTORS. Investments in foreign securities involve certain risks not
ordinarily associated with investments in securities of domestic issuers,
including fluctuations in foreign exchange rates, future political and economic
developments, and the possible imposition of exchange controls or other foreign
governmental laws or restrictions. See "Risk Factors."
 
INVESTMENT RESULTS. The investment results of the Fund are shown in the table of
"Financial Highlights."
 
ALTERNATIVE SALES ARRANGEMENTS. The Fund offers three classes of shares to the
public, each with its own sales charge structure: Class A shares, Class B shares
and Class C shares. Each class has distinct advantages and disadvantages for
different investors, and investors may choose the class of shares that best
suits their circumstances and objectives. Each class of shares represents an
interest in the same portfolio of investments of the Fund. See "Alternative
Sales Arrangements."
 
  Class A Shares. Class A shares are offered at net asset value per share plus a
maximum initial sales charge of 4.75% of the offering price (4.99% of the net
amount invested), reduced on investments of $100,000 or more. Investments of $1
million or more are not subject to any sales charge at the time of purchase, but
a contingent deferred sales charge ("CDSC") of 1.00% may be imposed on
redemptions made within one year of purchase. Class A shares are subject to an
annual service fee of up to 0.25% of its average daily net assets attributable
to such class of shares. See "Purchase of Shares -- Class A Shares" and
"Distribution and Service Plans."
 
  Class B Shares. Class B shares are offered at net asset value per share and
are subject to a maximum CDSC of 4.00% on redemptions made within the first or
second year after purchase and declining thereafter to 0.00% after the fifth
year. See "Redemption of Shares." Class B shares are subject to a combined
annual distribution fee and service fee of up to 1.00% of the Fund's average
daily net assets attributable to such class of shares. See "Purchase of
Shares -- Class B Shares" and "Distribution and Service Plans." Class B shares
convert automatically to Class A shares eight years after the end of the
calendar month in which the shareholder's order to purchase was accepted. See
"Alternative Sales Arrangements -- Conversion Feature."
 
  Class C Shares. Class C shares are offered at net asset value per share and
are subject to a CDSC of 1.00% on redemptions made within one year of purchase.
See "Redemption of Shares." Class C shares are subject to a combined annual
distribution fee and service fee of up to 1.00% of the Fund's average daily net
assets attributable to such class of shares. See "Purchase of Shares -- Class C
Shares" and "Distribution and Service Plans."
 
INVESTMENT ADVISERS. Van Kampen Asset Management Inc. (the "Adviser") is the
Fund's investment adviser. Morgan Stanley Asset Management Inc. (the
"Subadviser") provides sub-advisory services to the Adviser.
 
DISTRIBUTOR. Van Kampen Funds Inc. (the "Distributor") distributes the Fund's
shares.
 
                                        3
<PAGE>   4
 
DISTRIBUTIONS FROM THE FUND. Dividends from net investment income are
distributed annually. Net capital gains, if any, are distributed at least
annually. All dividends and distributions are automatically reinvested in shares
of the Fund at net asset value per share (without a sales charge) unless payment
in cash is requested. See "Distributions from the Fund."
 
  The foregoing is qualified in its entirety by reference to the more detailed
              information appearing elsewhere in this Prospectus.
 
                                        4
<PAGE>   5
 
- --------------------------------------------------------------------------------
SHAREHOLDER TRANSACTION EXPENSES
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                              CLASS A         CLASS B          CLASS C
                                                              SHARES          SHARES            SHARES
                                                              -------         -------          -------
<S>                                                           <C>        <C>                 <C>
Maximum sales charge imposed on purchases (as a percentage
  of offering price)........................................   4.75%(1)        None              None

Maximum sales charge imposed on reinvested dividends (as a
  percentage of offering price).............................    None           None              None

Deferred sales charge (as a percentage of the lesser of                                          Year
  original purchase price or redemption proceeds)...........    None(2)    Year 1--4.00%       1--1.00%
                                                                           Year 2--4.00%     After--None
                                                                           Year 3--3.00%
                                                                           Year 4--2.50%
                                                                           Year 5--1.50%
                                                                            After--None

Redemption fees (as a percentage of amount redeemed)........    None           None              None

Exchange fee................................................    None           None              None
</TABLE>
 
- --------------------------------------------------------------------------------
(1) Reduced for purchases of $100,000 and over. See "Purchase of Shares -- Class
    A Shares."
 
(2) Investments of $1 million or more are not subject to any sales charge at the
    time of purchase, but a CDSC of 1.00% may be imposed on certain redemptions
    made within one year of the purchase. See "Purchase of Shares -- Class A
    Shares."
 
                                        5
<PAGE>   6
 
- --------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES AND EXAMPLE
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                              CLASS A    CLASS B    CLASS C
                                                              SHARES     SHARES     SHARES
                                                              -------    -------    -------
<S>                                                           <C>        <C>        <C>
Management Fees (as a percentage of average daily net
  assets)...................................................   1.00%     1.00%      1.00%

12b-1 Fees (as a percentage of average daily net
  assets)(1)................................................   0.25%     1.00% (2)  1.00% (2)

Other Expenses (as a percentage of average daily net
  assets)...................................................   2.41%     2.42%      2.46%

Total Fund Operating Expenses (net of reimbursement) (as a
  percentage of average daily net assets)...................   3.66%     4.42%      4.46%
</TABLE>
 
- --------------------------------------------------------------------------------
(1) Class A shares are subject to an annual service fee of up to 0.25% of the
    average daily net assets attributable to such class of shares. Class B
    shares and Class C shares are each subject to a combined annual distribution
    and service fee of up to 1.00% of the average daily net assets attributable
    to such class of shares. See "Distribution and Service Plans."
 
(2) Long-term shareholders may pay more than the economic equivalent of the
    maximum front-end sales charges permitted by NASD Rules.
 
EXAMPLE:
 
<TABLE>
<CAPTION>
                                                                ONE      THREE      FIVE        TEN
                                                               YEAR      YEARS      YEARS      YEARS
                                                               ----      -----      -----      -----
<S>                                                           <C>       <C>        <C>        <C>
You would pay the following expenses on a $1,000 investment
  assuming (i) an operating expense ratio of 3.66% for Class
  A shares, 4.42% for Class B shares and 4.46% for Class C
  shares, (ii) a 5.00% annual return and (iii) redemption at
  the end of each time period:
  Class A...................................................    $83      $154       $228       $420
  Class B...................................................    $84      $164       $239       $440*
  Class C...................................................    $55      $135       $226       $458
You would pay the following expenses on the same $1,000
  investment assuming no redemption at the end of each time
  period:
  Class A...................................................    $83      $154       $228       $420
  Class B...................................................    $44      $134       $224       $440*
  Class C...................................................    $45      $135       $226       $458
</TABLE>
 
- --------------------------------------------------------------------------------
* Based on conversion to Class A shares after eight years.
 
  The purpose of the foregoing table is to assist an investor in understanding
the various costs and expenses that an investor in the Fund will bear directly
or indirectly. The "Example" reflects expenses based on the "Annual Fund
Operating Expenses" table as shown above carried out to future years and is
included to provide a means for the investor to compare expense levels of funds
with different fee structures over varying investment periods. To facilitate
such comparison, all funds are required by the SEC to utilize a 5.00% annual
return assumption. The ten year amount with respect to Class B shares of the
Fund reflects the lower aggregate 12b-1 and service fees applicable to such
shares after conversion to Class A shares. Class B shares acquired through the
exchange privilege are subject to the CDSC schedule relating to the Class B
shares of the fund from which the purchase of Class B shares was originally
made. Accordingly, future expenses as projected could be higher than those
determined in the above table if the investor's Class B shares were exchanged
from a fund with a higher CDSC. THE INFORMATION CONTAINED IN THE ABOVE TABLE
SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES AND ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN. For a more complete
description of such costs and expenses, see "Purchase of Shares," "Investment
Advisory Services," "Redemption of Shares" and "Distribution and Service Plans."
 
                                        6
<PAGE>   7
 
- --------------------------------------------------------------------------------
 
FINANCIAL HIGHLIGHTS (Selected data for a share of beneficial interest
outstanding throughout each of the periods indicated)
- --------------------------------------------------------------------------------
 
  The following financial highlights have been audited by PricewaterhouseCoopers
LLP, independent accountants, whose report thereon was unqualified. This
information should be read in conjunction with the financial statements and
notes thereto included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                         CLASS A SHARES                                CLASS B SHARES
                                   -----------------------------------------------------------   ---------------------------
                                                                                 MAY 16, 1994
                                                                                (COMMENCEMENT
                                       YEAR           YEAR           YEAR       OF INVESTMENT        YEAR           YEAR
                                      ENDED          ENDED          ENDED       OPERATIONS) TO      ENDED          ENDED
                                   DECEMBER 31,   DECEMBER 31,   DECEMBER 31,    DECEMBER 31,    DECEMBER 31,   DECEMBER 31,
                                       1997         1996(C)          1995            1994            1997         1996(C)
                                   ------------   ------------   ------------   --------------   ------------   ------------
<S>                                <C>            <C>            <C>            <C>              <C>            <C>
Net Asset Value, Beginning of the
 Period..........................    $10.530        $ 10.15        $  9.19         $  9.44         $10.379        $  10.10
                                     -------        -------        -------         -------         -------        --------
 Net Investment Income/Loss......     (0.088)           -0-            .08             .10           (.146)          (.106)
Net Realized and Unrealized
 Gain/Loss.......................      1.014          1.242         1.1375          (.2475)           .972           1.247
                                     -------        -------        -------         -------         -------        --------
Total from Investment
 Operations......................       .926          1.242         1.2175          (.1475)           .826           1.141
                                     -------        -------        -------         -------         -------        --------
Less:
 Distributions from and in Excess
   of Net Investment Income......        -0-            -0-          .0775            .075             -0-             -0-
 Distributions from and in Excess
   of Net Realized Gain..........      1.294           .862          .1800           .0275           1.294            .862
                                     -------        -------        -------         -------         -------        --------
Total Distributions..............      1.294           .862          .2575           .1025           1.294            .862
                                     -------        -------        -------         -------         -------        --------
Net Asset Value, End of the
 Period..........................    $10.162        $10.530        $ 10.15         $  9.19         $ 9.911        $ 10.379
                                     =======        =======        =======         =======         =======        ========
Total Return*(a).................      8.94%         12.44%         13.30%          (1.57%)**        8.10%          11.51%
Net Assets at End of the Period
 (In millions)...................    $  11.2        $   8.5        $  15.5         $  11.5         $  10.0        $    9.9
Ratio of Expenses to Average Net
 Assets*.........................      3.66%          2.87%          2.79%           2.75%           4.42%           3.76%
Ratio of Net Investment
 Income/Loss to Average Net
 Assets*.........................      (.67%)          .00%           .81%           1.54%          (1.45%)         (1.01%)
Portfolio Turnover...............       231%            91%           135%             50%**          231%             91%
Average Commission Paid Per
 Equity Share Traded(b)..........    $ .0606        $ .0214             --              --         $ .0606        $  .0214
*If certain expenses had not been assumed by the Adviser, total return would have been lower and the ratios would have been
 as follows:
Ratio of Expenses to Average Net
 Assets..........................        N/A          3.17%          3.68%           2.76%             N/A           4.06%
Ratio of Net Investment Income/
 Loss to Average Net Assets......        N/A          (.30%)         (.07%)          1.53%             N/A          (1.30%)
 
<CAPTION>
                                          CLASS B SHARES                                 CLASS C SHARES
                                   -----------------------------   -----------------------------------------------------------
                                                   MAY 16, 1994                                                  MAY 16, 1994
                                                  (COMMENCEMENT                                                 (COMMENCEMENT
                                       YEAR       OF INVESTMENT        YEAR           YEAR           YEAR       OF INVESTMENT
                                      ENDED       OPERATIONS) TO      ENDED          ENDED          ENDED       OPERATIONS) TO
                                   DECEMBER 31,    DECEMBER 31,    DECEMBER 31,   DECEMBER 31,   DECEMBER 31,    DECEMBER 31,
                                       1995            1994            1997         1996(C)          1995            1994
                                   ------------   --------------   ------------   ------------   ------------   --------------
<S>                                <C>            <C>              <C>            <C>            <C>            <C>
Net Asset Value, Beginning of the
 Period..........................    $  9.17         $  9.44         $10.395        $  10.12       $  9.20         $  9.44
                                     -------         -------         -------        --------       -------         -------
 Net Investment Income/Loss......       (.01)            .01          (0.139)          (.104)         (.02)            .05
Net Realized and Unrealized
 Gain/Loss.......................     1.1375          (.2065)           .965           1.241        1.1375          (.2165)
                                     -------         -------         -------        --------       -------         -------
Total from Investment
 Operations......................     1.1275          (.1965)           .826           1.137        1.1175          (.1665)
                                     -------         -------         -------        --------       -------         -------
Less:
 Distributions from and in Excess
   of Net Investment Income......      .0175            .046             -0-             -0-         .0175            .046
 Distributions from and in Excess
   of Net Realized Gain..........      .1800           .0275           1.294            .862         .1800           .0275
                                     -------         -------         -------        --------       -------         -------
Total Distributions..............      .1975           .0735           1.294            .862         .1975           .0735
                                     -------         -------         -------        --------       -------         -------
Net Asset Value, End of the
 Period..........................    $ 10.10         $  9.17         $ 9.927        $ 10.395       $ 10.12         $  9.20
                                     =======         =======         =======        ========       =======         =======
Total Return*(a).................     12.31%          (2.09%)**        8.09%          11.49%        12.16%          (1.77%)**
Net Assets at End of the Period
 (In millions)...................    $   8.1         $   7.4         $   1.7        $    1.7       $   1.9         $   1.3
Ratio of Expenses to Average Net
 Assets*.........................      3.73%           3.92%           4.46%           3.78%         3.79%           3.36%
Ratio of Net Investment
 Income/Loss to Average Net
 Assets*.........................      (.09%)           .13%          (1.50%)          (.99%)        (.18%)           .80%
Portfolio Turnover...............       135%             50%**          231%             91%          135%             50%**
Average Commission Paid Per
 Equity Share Traded(b)..........         --              --         $ .0606        $  .0214            --              --
*If certain expenses had not been
 as follows:
Ratio of Expenses to Average Net
 Assets..........................      4.61%           3.93%             N/A           4.07%         4.67%           3.38%
Ratio of Net Investment Income/
 Loss to Average Net Assets......      (.97%)           .12%             N/A          (1.28%)       (1.06%)           .78%
</TABLE>
 
- ---------------
**  Non-Annualized
(a) Total return is based upon net asset value which does not include payment of
    the maximum sales charge or contingent deferred sales charge.
(b) Represents the average brokerage commission paid per equity share traded
    during the period for trades where commissions were applicable. This
    disclosure was not required in fiscal years prior to 1996.
(c) Based on average month-end shares outstanding.
N/A Not Applicable
 
                                        7
<PAGE>   8
 
- --------------------------------------------------------------------------------
THE FUND
- --------------------------------------------------------------------------------
 
  The Fund is a non-diversified, open-end management investment company,
commonly known as a mutual fund. A mutual fund provides, for those who have
similar investment goals, a practical and convenient way to invest in a
diversified portfolio of securities by combining their resources in an effort to
achieve such goals.
 
  Van Kampen Asset Management Inc. (the "Adviser") provides investment advisory
and administrative services to the Fund. The Adviser or its affiliates also act
as investment adviser to other mutual funds distributed by Van Kampen Funds Inc.
(the "Distributor"). To obtain prospectuses and other information on any of
these other funds, please call the telephone number on the cover page of the
Prospectus.
 
- --------------------------------------------------------------------------------
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
  GENERAL. The investment objective of the Fund is to seek to provide total
return through a managed balance of foreign and domestic equity and debt
securities. Total return consists of current income, including dividends,
interest and discount accruals, and capital appreciation. The Adviser and the
Subadviser may vary the composition of the Fund from time to time based upon an
evaluation of economic and market trends and the anticipated relative total
return available from a particular type of security. Accordingly, the Fund may,
at any given time, be substantially invested in equity or debt securities. At
least 65% of the Fund's total assets will be invested in securities of issuers
located in at least three countries including the United States and at least 25%
of the Fund's assets will be maintained in debt securities. Achieving the Fund's
investment objective depends on management's abilities to assess the effect of
economic and market trends on different sectors of the market. There can be no
assurances that the investment objective of the Fund will be achieved. Because
of the managed approach of the Fund, portfolio turnover of the Fund may be
greater than portfolio turnover of other mutual funds resulting in increased
brokerage charges to the Fund.
 
  The Adviser, subject to the direction of the Fund's Trustees, provides the
Fund with an overall investment program consistent with the Fund's objective and
policies. Investments may be shifted among the world's various capital markets
and among different types of securities in accordance with ongoing analysis
provided by the Adviser and the Subadviser of trends and developments affecting
such markets and securities. The Adviser and the Subadviser are sometimes
referred to herein collectively as the "Advisers."
 
  The Advisers utilize a "top-down" approach in selecting investments for the
Fund that emphasizes country selection and weighting rather than individual
security selection. This approach reflects the Advisers' philosophy for this
Fund that a diversified selection of securities representing exposure to world
markets based upon the economic outlook and current valuation levels for each
country is an effective way to maximize the return and minimize the risk
associated with global investment.
 
  The Advisers determine country allocations for the Fund on an ongoing basis
within policy ranges dictated by each country's market capitalization and
liquidity. The Fund will invest in the United States and other industrialized
countries throughout the world that comprise the Morgan Stanley Capital
International World Index. These countries currently are Australia, Austria,
Belgium, Canada, Denmark, Finland, France, Germany, Hong Kong, Italy, Japan, the
Netherlands, New Zealand, Norway, Singapore/Malaysia, Spain, Sweden,
Switzerland, the United Kingdom and the United States. In addition, the Fund may
invest a portion of its assets in emerging country equity securities. The Fund
currently intends to invest in some or all of the following countries:
Argentina, Indonesia, Portugal, South Africa, Brazil, Malaysia, Philippines,
Thailand, India, Mexico, South Korea and Turkey.
 
  By analyzing a variety of macroeconomic and political factors, the Advisers
develop fundamental projections on interest rates, currencies, corporate profits
and economic growth for each country. These country projections are then used to
determine what the Advisers believe to be a fair value for the securities market
of each country. Discrepancies between actual value and fair value, as
determined by the Advisers, provide an expected return for each securities
market. The expected return is adjusted by currency return expectations derived
from the Advisers' purchasing-power parity exchange rate model to arrive at an
expected total return in U.S. Dollars. The final country allocation decision is
then reached by considering the expected total return in light of various
country specific considerations such as market size, volatility, liquidity and
country risk.
 
                                        8
<PAGE>   9
 
  Within a particular country, common stock investments are made through the
purchase of common stocks which, in the aggregate, replicate a broad market
index, which in most cases will be the Morgan Stanley Capital International
("MSCI") Index for the particular country. The MSCI Indices measure the
performance of stock markets worldwide. The various MSCI Indices are based on
the share prices of companies listed on the local stock exchange of the
specified country or countries within a specified region. The combined market
capitalization of companies in these indices represent approximately 60 percent
of the aggregate market value of the covered stock exchanges. Companies included
in the MSCI country index replicate the industry composition of the local market
and are a representative sampling of large, medium and small companies, subject
to liquidity. Non-domiciled companies traded on the local exchange and companies
with restricted float due to dominant shareholders or cross-ownership are
avoided. The Advisers may overweight or underweight an industry segment of a
particular index if it concludes this would be advantageous to the Fund.
 
  The investment objective and policies, the percentage limitations, and the
types of securities in which the Fund may invest generally are not fundamental
policies and may be changed by the Trustees, unless expressly governed by
certain limitations as described under "Investment Practices -- Investment
Restrictions" which can be changed only by action of the shareholders. If there
is a change in the investment objective of the Fund, shareholders should
consider whether the Fund remains an appropriate investment in light of their
then current financial position and needs. For additional information regarding
the investment practices of the Fund see "Investment Practices."
 
  An investment in the Fund may not be appropriate for all investors. The Fund
is not intended to be a complete investment program, and investors should
consider their long-term investment goals and financial needs when making an
investment decision with respect to the Fund. An investment in the Fund is
intended to be a long-term investment, and should not be used as a trading
vehicle.
 
  EQUITY AND DEBT SECURITIES. Equity securities in which the Fund may invest
include common stocks, preferred stocks and warrants or options to acquire such
securities.
 
  Debt securities in which the Fund may invest include government securities and
high quality debt securities of U.S. and foreign corporations. Government
securities include debt securities issued or guaranteed by the United States or
foreign governments or their agencies, authorities or instrumentalities.
Securities of any one issuer (other than the United States government) will
represent no more than 25% of the Fund's total assets. The Fund may purchase
securities that are issued by the government of one nation but denominated in
the currency of another nation (or in a multinational currency unit).
 
  The Fund may invest in debt obligations of supranational lending entities
organized or supported by several national governments. Supranational entities
in which the Fund may invest include, without limitation, the following:
International Bank for Reconstruction and Development (World Bank), established
to promote reconstruction and economic development in its member nations;
European Coal and Steel Community, a partnership of 12 European countries
created to establish a common market for coal and steel and to further the
economic development in its member countries; European Investment Bank,
established to finance investment projects that contribute to the balanced
development of the European Economic Community; European Bank for Reconstruction
& Development, whose objectives are to foster the transition toward open market
economies and to promote private and entrepreneurial initiative in countries of
central and eastern Europe; Inter-American Development Bank, established to
further the development of its Latin American member countries; African
Development Bank, established to contribute to the economic development and
social progress of its African member countries; Asian Development Bank,
established to promote economic growth and cooperation in Asia and the Far East.
The Fund may from time to time invest up to 25% of its total assets in these and
other supranational entities.
 
  The Fund limits its purchases of debt securities to high quality obligations.
For debt obligations other than commercial paper, this includes securities that
are rated Aa3 or better by Moody's Investors Service, Inc. ("Moody's") or AA- or
better by Standard & Poor's Ratings Group ("S&P"), or that are not rated but
considered by the Advisers to be of equivalent quality. A description of the
Moody's and S&P ratings is included in the Statement of Additional Information.
 
  DEPOSITARY RECEIPTS. The Fund may purchase foreign securities in the form of
American Depositary Receipts ("ADRs") and European Depositary Receipts ("EDRs")
or other securities representing underlying shares of foreign companies. These
securities are not necessarily denominated in the same currency as the
underlying securities but generally are denominated in the currency of the
market in which they are traded. ADRs are receipts typically issued by an
American bank or trust company which evidence ownership of underlying securities
issued by a foreign corporation. EDRs
 
                                        9
<PAGE>   10
 
are receipts issued in Europe by banks or depositories which evidence a similar
ownership arrangement. ADRs are publicly traded on exchanges or over-the-counter
in the United States and are issued through "sponsored" or "unsponsored"
arrangements. In a sponsored ADR arrangement, the foreign issuer assumes the
obligation to pay some or all of the depositary's transaction fees, whereas
under an unsponsored arrangement, the foreign issuer assumes no obligations and
the depositary's transaction fees are paid by the ADR holders. In addition, less
information is available in the United States about an unsponsored ADR than
about a sponsored ADR. The Fund may invest in ADRs through both sponsored and
unsponsored arrangements.
 
  CURRENCY EFFECTS. The Fund may invest in securities denominated in United
States dollars and one or more foreign currencies. The percentage of assets
invested in securities of a particular country or denominated in a particular
currency will vary in accordance with the Advisers' assessment of the relative
yield and appreciation potential of such securities and the relationship of a
country's currency to the United States dollar. Fundamental economic strength,
credit quality and interest rate trends are the principal factors considered by
the Advisers in determining whether to increase or decrease the emphasis placed
upon a particular type of security within the Fund's investment portfolio.
 
  The returns available from securities denominated in foreign currencies can be
adversely affected by changes in exchange rates. The Advisers believe that the
use of foreign currency hedging techniques, including "cross-hedges", can help
protect against changes in the United States dollar value of income available
for distribution to shareholders and declines in the net asset value of the
Fund's shares resulting from adverse changes in currency exchange rates. For
example, the return available from securities denominated in a particular
foreign currency would diminish in the event the value of the United States
dollar increased against such currency. Such a decline could be partially or
completely offset by an increase in value of a hedge involving a foreign
currency contract, or by a cross-hedge involving a forward currency contract,
where such contract is available on terms more advantageous to the Fund than a
contract to sell the currency in which the position being hedged is denominated.
The Advisers believe that hedges and cross-hedges can therefore provide
significant protection of net asset value in the event of a general rise in the
United States dollar against foreign currencies. A hedge or cross-hedge cannot
protect completely against exchange rate risks, and if the Advisers are
incorrect in their judgment of future exchange rate relationships, the Fund
could be in a less advantageous position than if such a hedge had not been
established.
 
  TEMPORARY SHORT-TERM INVESTMENTS. The Fund's policy generally is to invest in
a globally diversified portfolio of equity and longer term debt securities. In
the interest of preserving shareholders' capital and consistent with the Fund's
investment objective, however, the Advisers may employ a temporary defensive
investment strategy if they determine that such a strategy is warranted. Under a
defensive strategy, the Fund may hold cash (United States dollars or foreign
currencies) or invest any portion or all of its assets in high quality money
market instruments. It is impossible to predict when or for how long the Fund
will employ defensive strategies. Money market instruments in which the Fund may
invest include, but are not limited to, the following instruments of United
States or foreign issuers: government securities; commercial paper; bank
certificates of deposit and bankers' acceptances; and repurchase agreements
related to any of the foregoing. The Fund will purchase commercial paper only if
it is rated Prime-1 or Prime-2 by Moody's or A-1 or A-2 by S&P or, if not rated,
is considered by the Advisers to be of equivalent quality. In addition, for
temporary defensive reasons, such as during a time of international political or
economic uncertainty, most or all of the Fund's investments may be made in the
United States and denominated in United States dollars.

- --------------------------------------------------------------------------------
RISK FACTORS
- --------------------------------------------------------------------------------
 
  FOREIGN SECURITIES AND CURRENCIES. Investing in securities issued by foreign
corporations and governments involves risks not typically associated with
investing in obligations issued by domestic corporations and the United States
government. The values of foreign investments are affected by changes in
currency rates or exchange control regulations, application of foreign tax laws,
including withholding taxes, changes in governmental administration or economic
or monetary policy (in this country or abroad) or changed circumstances in
dealings between nations. Foreign currency exchange rates are determined by
forces of supply and demand on the foreign exchange markets. These forces are
themselves affected by the international balance of payments and other economic
and financial conditions, government intervention, speculation and other
factors. Moreover, foreign currency exchange rates may be affected by the
regulatory control of the exchanges on which the currencies trade. Costs are
incurred in connection with conversions between currencies. In addition, foreign
brokerage commissions and dealer mark-ups are generally higher than in the
United States, and foreign securities markets
 
                                       10
<PAGE>   11
 
may be less liquid, more volatile and subject to less governmental supervision
than in the United States. Investments in foreign countries could be affected by
other factors not present in the United States, including expropriation,
confiscatory taxation, lack of uniform accounting and auditing standards and
potential difficulties in enforcing contractual obligations, and could be
subject to extended settlement periods. Furthermore, issuers of foreign common
stocks are subject to different, often less comprehensive, accounting, reporting
and disclosure requirements than domestic issuers. Foreign custodial costs
relating to the Fund's portfolio securities may be higher than domestic
custodial costs.
 
  NON-DIVERSIFICATION. The Fund is a "non-diversified" investment company, which
means the Fund is not limited in the proportion of its assets that may be
invested in the securities of a single issuer. However, the Fund intends to
conduct its operations so as to qualify as a "regulated investment company" for
purposes of the Internal Revenue Code of 1986, as amended (the "Code"), which
will relieve the Fund of any liability for federal income tax to the extent its
earnings are distributed to shareholders. See "Tax Status." In order to qualify,
among other requirements, the Fund will limit its investments so that, at the
close of each calendar quarter, (i) not more than 25% of the market value of the
Fund's total assets are invested in securities of a single issuer (other than
the U.S. Government, its agencies and instrumentalities), and (ii) at least 50%
of the market value of its total assets is invested in cash, securities of the
U.S. Government, its agencies and instrumentalities and other securities limited
in respect of any one issuer to an amount not greater than 5% of the market
value of the Fund's total assets and not more than 10% of the outstanding voting
securities of such issuer. For purposes of the Fund's requirements to maintain
diversification for tax purposes, the issuer of a loan participation will be the
underlying borrower. In cases where the Fund does not have recourse directly
against the borrower, both the borrower and each agent bank and co-lender
interposed between the Fund and the borrower, will be deemed issuers of the loan
participation for tax diversification purposes. Since the Fund, as a
non-diversified investment company, may invest in a smaller number of individual
issuers than a diversified investment company, an investment in the Fund may,
under certain circumstances, present greater risks to an investor than an
investment in a diversified company.
 
  YEAR 2000. Like other mutual funds, financial and business organizations and
individuals around the world, the Fund could be adversely affected if the
computer systems used by the Advisers and other service providers do not
properly process and calculate date-related information and data from and after
January 1, 2000. This is commonly known as the "Year 2000 Problem". The Advisers
are taking steps that they believe are reasonably designed to address the Year
2000 Problem with respect to computer systems that it uses and obtain reasonable
assurances that comparable steps are being taken by the Fund's other major
service providers. At this time, there can be no assurance that these steps will
be sufficient to avoid any adverse impact upon the Fund. In addition, the Year
2000 Problem may adversely affect the issuers of securities in which the Fund
may invest which, in turn, may adversely affect the net asset value of the Fund.
 
- --------------------------------------------------------------------------------
INVESTMENT PRACTICES
- --------------------------------------------------------------------------------
 
  REPURCHASE AGREEMENTS. The Fund may enter into repurchase agreements with
banks or broker-dealers in order to earn a return on temporarily available cash.
A repurchase agreement is a short-term investment in which the purchaser (i.e.,
the Fund) acquires ownership of a debt security and the seller agrees to
repurchase the obligation at a future time and set price, thereby determining
the yield during the holding period. Repurchase agreements involve certain risks
in the event of default by the other party. The Fund will not invest more than
15% of its net assets in securities subject to repurchase agreements that do not
mature within seven days and in any other illiquid securities. In the event of
the bankruptcy of the seller of a repurchase agreement, the Fund could
experience delays in liquidating the underlying securities, and the Fund could
incur a loss including: (a) possible decline in the value of the underlying
security during the period while the Fund seeks to enforce its rights thereto;
(b) possible lack of access to income on the underlying security during this
period; and (c) expenses of enforcing its rights. See the Statement of
Additional Information.
 
  For the purpose of investing in repurchase agreements, the Adviser aggregates
the cash that certain funds advised or subadvised by the Adviser or certain of
its affiliates would otherwise invest separately into a joint account. The cash
in the joint account is then invested in repurchase agreements and the funds
that contributed to the joint account share pro rata in the net revenue
generated. The Adviser believes that the joint account produces efficiencies and
economies of scale that may contribute to reduced transaction costs, higher
returns, higher quality investments and greater diversity of investments for the
Fund than would be available to the Fund investing separately. The manner in
which the joint account is managed is subject to conditions set forth in an SEC
exemptive order authorizing this practice, which conditions are designed to
ensure the fair administration of the joint account and to protect the amounts
in that account.
 
                                       11
<PAGE>   12
 
  PORTFOLIO TRANSACTIONS AND BROKERAGE PRACTICES. The Advisers are responsible
for the placement of orders for the purchase and sale of portfolio securities
for the Fund and the negotiation of brokerage commissions on such transactions.
Brokerage firms are selected on the basis of their professional capability for
the type of transaction and the value and quality of execution services rendered
on a continuing basis. The debt securities in the Fund's portfolio generally are
traded in the over-the-counter market through dealers. A dealer is a securities
firm or bank which makes a market for securities by opening a position at one
price and closing the position at a slightly more favorable price. The
difference between the prices is known as a spread. Foreign currency and forward
currency exchange contracts are traded in a similar fashion in a dealer market
maintained primarily by large commercial banks. The Fund will pay brokerage
commissions in connection with transactions in exchange-traded options, futures
contracts and related options. Spreads or commissions for transactions executed
in foreign markets often are higher than in the United States. The Advisers are
authorized to place portfolio transactions, to the extent permitted by law, with
brokerage firms affiliated with the Fund, the Advisers or the Distributor and
with brokerage firms participating in the distribution of shares of the Fund if
they reasonably believe that the quality of the execution and the commission are
comparable to that available from other qualified brokerage firms. The Advisers
are authorized to pay higher commissions to brokerage firms that provide them
with investment and research information than to firms which do not provide such
services if the Advisers determine that such commissions are reasonable in
relation to the overall services provided. The information received may be used
by the Advisers in managing the assets of other advisory accounts as well as in
the management of the assets of the Fund.
 
  PORTFOLIO TURNOVER. The Fund may experience a high rate of portfolio turnover
which may vary from year to year with respect to both its equity and debt
securities. The rate of portfolio turnover is not a limiting factor when the
Advisers deem it desirable to purchase or sell securities or to engage in
transactions in options, futures contracts and options on futures contracts. A
100% turnover rate would occur, for example, if all the securities held by the
Fund were replaced in a period of one year. Higher portfolio turnover involves
correspondingly greater brokerage commissions and other transaction costs, which
are borne directly by the Fund, and may result in realization of short-term
capital gains if securities are held for one year or less, which may be subject
to applicable income taxes. See "Tax Status." Although no assurance can be given
with respect to future portfolio turnover rates, it is anticipated that the
Fund's rate of portfolio turnover with respect to either its debt or equity
securities will not generally exceed 400%, with the rate of portfolio turnover
tending to be higher with respect to debt securities.
 
  LOANS OF PORTFOLIO SECURITIES. The Fund may lend portfolio securities to
unaffiliated brokers, dealers and financial institutions provided that (a)
immediately after any such loan, the value of the securities loaned does not
exceed 15% of the total value of the Fund's assets, and (b) any securities loan
is collateralized in accordance with applicable regulatory requirements. The
Advisers believe the risk of loss on such transactions is slight, because, if a
borrower were to default for any reason, the collateral should satisfy the
obligation. See the Statement of Additional Information.
 
  RESTRICTED SECURITIES. The Fund may invest up to 15% of its net assets in
restricted securities and other illiquid assets. As used herein, restricted
securities are those that have been sold in the United States without
registration under the Securities Act of 1933, as amended ("1933 Act"), and are
thus subject to restrictions on resale. Excluded from the limitation, however,
are any restricted securities which are eligible for resale pursuant to Rule
144A under the 1933 Act and which have been determined to be liquid by the
Trustees or by the Advisers pursuant to Trustee-approved guidelines. The
determination of liquidity is based on the volume of reported trading in the
institutional secondary market for each security. The Trustees will carefully
monitor the Fund's investment in Rule 144A securities focusing on such factors,
among others, as valuation, liquidity and availability of information. This
investment practice could have the effect of increasing the level of illiquidity
in the Fund to the extent that qualified institutional buyers become for a time
uninterested in purchasing these restricted securities. These difficulties and
delays could result in the Fund's inability to realize a favorable price upon
disposition of restricted securities, and in some cases might make disposition
of such securities at the time desired by the Fund impossible. Since market
quotations are not readily available for restricted securities, such securities
will be valued by a method that the Fund's Trustees believe accurately reflects
fair value. Also excluded from this limitation on restricted securities are
securities purchased by the Fund issued by other investment companies to the
extent permitted by (i) the 1940 Act, as amended from time to time, (ii) the
rules and regulations promulgated by the SEC under the 1940 Act, as amended from
time to time, or (iii) an exemption or other relief from the provisions of the
1940 Act.
 
  SHORT SALES AGAINST THE BOX. The Fund may from time to time make short sales
of securities it owns or has the right to acquire. A short sale is "against the
box" to the extent that the Fund contemporaneously owns or has the right to
obtain at
                                       12
<PAGE>   13
 
no added cost securities identical to those sold short. In a short sale, the
Fund does not immediately deliver the securities sold and does not receive the
proceeds from the sale. The Fund is said to have a short position in the
securities sold until it delivers the securities sold, at which time it receives
the proceeds of the sale. The Fund may not make short sales or maintain a short
position if to do so would cause more than 25% of its total assets, taken at
market value, to be involved in such sales.
 
  The Fund may close out a short position by purchasing and delivering an equal
amount of the securities sold short, rather than by delivering securities
already held by the Fund, because the Fund may want to continue to receive
interest and dividend payments on securities in its portfolio.
 
  FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS. The Fund may enter into
contracts for the purchase or sale for future delivery of securities or foreign
currencies, or contracts based on financial indices including any stock index or
index of United States Government securities or foreign government securities
("futures contracts") and may purchase and write put and call options to buy or
sell futures contracts ("options on futures contracts"). A "sale" of a futures
contract means the acquisition of a contractual obligation to deliver the
securities or foreign currencies called for by the contract at a specified price
on a specified date. A "purchase" of a futures contract means the incurring of a
contractual obligation to acquire the securities or foreign currencies called
for by the contract at a specified price on a specified date. The purchaser of a
futures contract on an index agrees to take or make delivery of an amount of
cash equal to the difference between a specified multiple of the value of the
index on the expiration date of the contract ("current contract value") and the
price at which the contract was originally struck. No physical delivery of the
securities underlying the index is made. Options on futures contracts to be
written or purchased by the Fund will be traded on United States or foreign
exchanges. These investment techniques are used to hedge against anticipated
future changes in market values or interest or exchange rates which otherwise
might either adversely affect the value of the Fund's portfolio securities or
adversely affect the price of securities which the Fund intends to purchase at a
later date. See the Statement of Additional Information for further discussion
of the use, risks and costs of futures contracts and options on futures
contracts.
 
  OPTIONS ON FOREIGN CURRENCIES. The Fund may purchase and write put and call
options on foreign currencies to increase the Fund's gross income and for the
purpose of protecting against declines in the United States dollar value of
foreign currency denominated portfolio securities and against increases in the
United States dollar cost of such securities to be acquired. As in the case of
other kinds of options, however, the writing of an option on a foreign currency
constitutes only a partial hedge, up to the amount of the premium received, and
the Fund could be required to cover its position by purchasing or selling
foreign currencies at disadvantageous exchange rates, thereby incurring losses.
The purchase of an option on a foreign currency may constitute an effective
hedge against fluctuations in exchange rates although, in the event of rate
movements adverse to the Fund's position, the Fund may forfeit the entire amount
of the premium plus related transaction costs. Options on foreign currencies
written or purchased by the Fund are traded on United States and foreign
exchanges or over-the-counter. There is no specific percentage limitation on the
Fund's investments in options on foreign currencies. See the Statement of
Additional Information for further discussion of the use, risks and costs of
options on foreign currencies.
 
  OPTIONS ON PORTFOLIO SECURITIES. The Fund may write call options on certain of
its portfolio securities at such time and from time to time as Fund management
shall determine to be appropriate and consistent with the investment objective
of the Fund. Generally, the Fund expects that options written by it will be
conducted on recognized securities exchanges. There is no fixed limit on the
percentage of the Fund's assets upon which options may be written.
 
  The Fund is authorized to purchase and sell over-the-counter options ("OTC
Options"). OTC options are purchased from or sold to securities dealers,
financial institutions or other parties ("Counterparties") through direct
bilateral agreement with the Counterparty. The Fund will sell only OTC Options
(other than OTC currency options) that are subject to a buy-back provision
permitting the Fund to require the Counterparty to sell the option back to the
Fund at a formula price within seven days. The staff of the SEC currently takes
the position that, in general, OTC options on securities other than U.S.
Government securities purchased by the Fund, and portfolio securities covering
OTC options sold by the Fund, are illiquid securities subject to the Fund's
limitation on investing in illiquid securities.
 
  The Fund will receive a premium (less any commissions) from the writing of
such contracts, consistent with the Fund's investment objective. The writing of
option contracts is a highly specialized activity which involves investment
techniques and risks different from those ordinarily associated with investment
companies, although the Fund believes that the writing of call options listed on
an exchange or traded in the over-the-counter market, where the Fund owns the
underlying
                                       13
<PAGE>   14
 
security, tends to reduce such risks. The writer foregoes the opportunity to
profit from an increase in market price of the underlying security above the
exercise price so long as the option remains open. See the Statement of
Additional Information for more information.
 
  FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS. The Fund may purchase or sell
forward foreign currency exchange contracts ("forward contracts") to attempt to
minimize the risk to the Fund from adverse changes in the relationship between
the United States dollar and foreign currencies. A forward contract is an
obligation to purchase or sell a specific currency for an agreed price at a
future date which is individually negotiated and privately traded by currency
traders and their customers. The Fund may enter into a forward contract, for
example, when it enters into a contract for the purchase or sale of a security
denominated in a foreign currency in order to "lock in" the United States dollar
price of the security ("transaction hedge"). Additionally, for example, when the
Fund believes that a foreign currency may suffer a substantial decline against
the United States dollar, it may enter into a forward sale contract to sell an
amount of that foreign currency approximating the value of some or all of the
Fund's portfolio securities denominated in such foreign currency, or when the
Fund believes that the United States dollar may suffer a substantial decline
against a foreign currency, it may enter into a forward purchase contract to buy
that foreign currency for a fixed dollar amount ("position hedge"). In this
situation, the Fund may, in the alternative, enter into a forward contract to
sell a different foreign currency for a fixed United States dollar amount where
the Fund believes that the United States dollar value of the currency to be sold
pursuant to the forward contract will fall whenever there is a decline in the
United States dollar value of the currency in which portfolio securities of the
Fund are denominated ("cross-hedge").
 
  The Fund custodian will place cash or liquid securities in a segregated
account having a value equal to the aggregate amount of the Fund's commitments
under forward contracts entered into with respect to position hedges and
cross-hedges. If the value of the securities placed in the segregated account
declines, additional cash or liquid securities are placed in the account on a
daily basis so that the value of the account equals the amount of the Fund's
commitments with respect to such contracts. As an alternative to maintaining all
or part of the segregated account, the Fund may purchase a call option
permitting the Fund to purchase the amount of foreign currency being hedged by a
forward sale contract at a price no higher than the forward contract price, or
the Fund may purchase a put option permitting the Fund to sell the amount to
foreign currency subject to a forward purchase contract at a price as high or
higher than the forward contract price. Unanticipated changes in currency prices
may result in poorer overall performance for the Fund than if it had not entered
into such contracts.
 
  POTENTIAL RISKS OF OPTIONS, FUTURES AND FORWARD CONTRACTS. The successful use
of the foregoing investment techniques depends on the ability of the Fund's
Advisers to forecast the markets and interest rate and currency exchange rate
movements correctly. Should the markets or interest or exchange rates move in an
unexpected manner, the Fund may not achieve the anticipated benefits of futures
contracts, options or forward contracts or may realize losses and thus be in a
worse position than if such strategies had not been used. Unlike many
exchange-traded futures contracts and options on futures contracts, there are no
daily price fluctuation limits with respect to options on currencies and forward
contracts, and adverse market movements could therefore continue to an unlimited
extent over a period of time. In addition, movements in the prices of such
instruments and movements in the price of the securities and currencies hedged
or used for cover may not be closely correlated and could produce unanticipated
losses. The Fund's ability to dispose of its positions in futures contracts,
options and forward contracts will depend on the availability of liquid markets
in such instruments. Markets in options and futures with respect to a number of
securities and currencies are relatively new and still developing. It is
impossible to predict the amount of trading interest that may exist in various
types of futures contracts. If a secondary market does not exist with respect to
an option purchased or written by the Fund over-the-counter, it might not be
possible to effect a closing transaction in the option (i.e., dispose of the
option) with the result that (i) an option purchased by the Fund would have to
be exercised in order for the Fund to realize any profit and (ii) the Fund may
not be able to sell currencies or portfolio securities covering an option
written by the Fund until the option expires or it delivers the underlying
futures contract or currency upon exercise. Therefore, no assurance can be given
that the Fund will be able to utilize these instruments effectively for the
purposes set forth above. The Fund may not purchase or sell futures contracts or
related options for which the aggregate initial margin and premiums exceed 5% of
the fair market value of the Fund's assets. In order to prevent leverage in
connection with the purchase of futures contracts or call options thereon by the
Fund, an amount of cash or liquid securities equal to the market value of the
obligation under the futures contracts (less any related margin deposits) will
be maintained in a segregated account with the Custodian. The Fund's ability to
engage in options and futures transactions may be limited by tax considerations.
See the Statement of Additional Information.
 
                                       14
<PAGE>   15
 
  FORWARD COMMITMENTS. The Fund may purchase or sell debt securities on a
"when-issued" or "delayed delivery" basis ("Forward Commitments"). These
transactions occur when securities are purchased or sold by the Fund with
payment and delivery taking place in the future, frequently a month or more
after such transaction. This price is fixed on the date of the commitment, and
the seller continues to accrue interest on the securities covered by the Forward
Commitment until delivery and payment take place. At the time of settlement, the
market value of the securities may be more or less than the purchase or sale
price.
 
  The Fund may either settle a Forward Commitment by taking delivery of the
securities or may either resell or repurchase a Forward Commitment on or before
the settlement date in which event the Fund may reinvest the proceeds in another
Forward Commitment. The Fund's use of Forward Commitments may increase its
overall investment exposure and thus its potential for gain or loss. When
engaging in Forward Commitments, the Fund relies on the other party to complete
the transaction; should the other party fail to do so, the Fund might lose a
purchase or sale opportunity that could be more advantageous than alternative
opportunities at the time of the failure.
 
  The Fund maintains a segregated account (which is marked to market daily) of
cash, liquid securities or the security covered by the Forward Commitment (in
the case of a Forward Commitment sale) with the Fund's Custodian in an aggregate
amount equal to the amount of its commitment as long as the obligation to
purchase or sell continues.
 
  INVESTMENT RESTRICTIONS. The Fund has adopted a number of fundamental
investment restrictions that may not be changed without approval by a vote of a
majority of the outstanding voting securities of the Fund (as defined in the
Investment Company Act of 1940, as amended (the "1940 Act")). The percentage
limitations need only be met at the time the investment is made or other
relevant action taken. These restrictions provide, among other things, that the
Fund may not:
 
  1. Purchase any security (other than obligations of the United States
     Government, its agencies or instrumentalities) if more than 25% of its
     total assets (taken at current value) would be invested in a single
     industry except that, if the value of debt securities owned by the Fund
     with remaining maturities of less than 13 months exceeds 35% of the value
     of the Fund's total assets, the Fund will invest at least 25% of its assets
     in securities issued by banks. Although this policy is not applicable to
     debt securities issued by government or political subdivisions because such
     issuers are not members of any industry, the Fund does not intend to invest
     more that 25% of its total assets in debt securities issued or guaranteed
     by any government (except U.S. Government, its agencies or
     instrumentalities).
 
  2. Borrow money, except temporarily from banks to facilitate payment of
     redemption requests and then only in amounts not exceeding 33 1/3% of its
     net assets, or pledge more than 10% of its net assets in connection with
     permissible borrowings or purchase additional securities when money
     borrowed exceeds 5% of its net assets. Margin deposits or payments in
     connection with the writing of options, or in connection with the purchase
     or sale of forward contracts, futures, foreign currency futures and related
     options, are not deemed to be a pledge or other encumbrance.
 
  3. Lend money except through the purchase of (i) United States and foreign
     government securities, commercial paper, banker's acceptances, certificates
     of deposit and similar evidence of indebtedness, both foreign and domestic,
     and (ii) repurchase agreements; or lend securities in an amount exceeding
     15% of the total assets of the Fund. The purchase of a portion of an issue
     of securities described under (i) above distributed publicly, whether or
     not the purchase is made on the original issuance, is not considered the
     making of a loan.
 
- --------------------------------------------------------------------------------
INVESTMENT ADVISORY SERVICES
- --------------------------------------------------------------------------------
 
  THE ADVISER. The Adviser is a wholly-owned subsidiary of Van Kampen
Investments Inc. ("Van Kampen"). Van Kampen is a diversified asset management
company with more than two million retail investor accounts, extensive
capabilities for managing institutional portfolios, and more than $65 billion
under management or supervision. Van Kampen's more than 50 open-end and 39
closed-end funds and more than 2,500 unit investment trusts are professionally
distributed by leading financial advisers nationwide. Van Kampen Funds Inc., the
distributor of the Fund and the sponsor of the funds mentioned above, is also a
wholly-owned subsidiary of Van Kampen. Van Kampen is an indirect wholly-owned
subsidiary of Morgan Stanley Dean Witter & Co. The Adviser's principal office is
located at One Parkview Plaza, Oakbrook Terrace, Illinois 60181.
 
                                       15
<PAGE>   16
 
  Morgan Stanley Dean Witter & Co. and various of its directly or indirectly
owned subsidiaries, including Morgan Stanley Asset Management Inc., an
investment adviser (the "Subadviser"), Morgan Stanley & Co. Incorporated, a
registered broker-dealer and investment adviser, and Morgan Stanley
International are engaged in a wide range of financial services. Their principal
businesses include securities underwriting, distribution and trading; merger,
acquisition, restructuring and other corporate finance advisory activities;
merchant banking; stock brokerage and research services; credit services; asset
management; trading of futures, options, foreign exchange, commodities and swaps
(involving foreign exchange, commodities, indices and interest rates); real
estate advice, financing and investing; and global custody, securities clearance
services and securities lending.
 
  THE SUBADVISER. The Subadviser is a wholly-owned subsidiary of Morgan Stanley
Group, Inc. and is an affiliate of the Adviser. The Subadviser provides
portfolio management and named fiduciary services to various closed-end and
open-end investment companies, taxable and nontaxable institutions,
international organizations and individuals investing in United States and
international equities and fixed income securities. At December 31, 1997, the
Subadviser had, together with its affiliated investment management companies,
assets under management (including assets under fiduciary advisory control)
totaling approximately $87 billion. The Subadviser emphasizes a global
investment strategy and benefits from research coverage of a broad spectrum of
investment opportunities worldwide and draws upon the capabilities of its asset
management specialists located in various offices throughout the world,
including New York, London, Tokyo, Singapore, Bombay, Hong Kong, Milan and
Sydney. The Subadviser also draws upon the research capabilities of Morgan
Stanley Group Inc. and its other affiliates as well as the research and
investment ideas of other companies whose brokerage services the Subadviser
utilizes. The address of the Subadviser is 1221 Avenue of the Americas, New
York, New York 10020.
 
  ADVISORY AGREEMENTS. The Fund retains the Adviser to manage the investment of
its assets and to place orders for the purchase and sale of its portfolio
securities. The Adviser has entered into a sub-advisory agreement (the
"Sub-advisory Agreement") with the Subadviser to assist it in performing its
investment advisory functions. The Subadviser will be primarily responsible for
recommending the allocation of investments among various international markets
and currencies; recommendation and selection of particular securities in the
international markets; and placement of portfolio transactions in the foreign
markets. Under an investment advisory agreement between the Adviser and the Fund
(the "Advisory Agreement"), the Fund pays the Adviser a monthly fee computed on
average daily net assets of the Fund at the annual rate of 1.00% of the Fund's
average daily net assets. This fee is higher than that charged by most other
mutual funds but the Fund's Trustees believe it is justified by the special
international nature of the Fund and its asset allocation features and it is not
necessarily higher than the fees charged by certain mutual funds with an
investment objective and investment policies similar to those of the Fund. Under
the Advisory Agreement, the Fund also reimburses the Adviser for the cost of the
Fund's accounting services, which include maintaining its financial books and
records and calculating its daily net asset value. Operating expenses paid by
the Fund include shareholder service agency fees, service fees, distribution
fees, custodian fees, legal and accounting fees, the costs of reports and
proxies to shareholders, trustees' fees (other than those who are affiliated
persons as defined in the 1940 Act of the Adviser, Distributor, Van Kampen
Investor Services Inc., Van Kampen or Morgan Stanley Dean Witter & Co.), and all
other business expenses not specifically assumed by the Adviser. Advisory
(management) fees and total operating expense ratios are shown under the caption
"Annual Fund Operating Expenses and Example" herein. Pursuant to the
Sub-advisory Agreement, the Subadviser receives on an annual basis 50% of the
compensation received by the Adviser.
 
  From time to time as the Adviser, the Subadviser or the Distributor may deem
appropriate, they may voluntarily undertake to reduce the Fund's expenses by
reducing the fees payable to them to the extent of, or bearing expenses in
excess of, such limitations as they may establish.
 
  The Adviser may utilize at its own expense credit analysis, research and
trading support services provided by its affiliate, Van Kampen Investment
Advisory Corp. ("Advisory Corp.")
 
  PERSONAL INVESTMENT POLICIES. The Fund, the Adviser and the Subadviser have
adopted Codes of Ethics designed to recognize the fiduciary relationship between
the Fund, the Adviser, the Subadviser and their respective employees. The Codes
permit directors, trustees, officers and employees to buy and sell securities
for their personal accounts subject to certain restrictions. Persons with access
to certain sensitive information are subject to pre-clearance and other
procedures designed to prevent conflicts of interest.
 
                                       16
<PAGE>   17
 
  PORTFOLIO MANAGEMENT. Barton M. Biggs, Madhav Dhar, Francine J. Bovich and Ann
D. Thivierge assumed the primary responsibility for the day-to-day management of
equity portion the Fund's portfolio on April 1, 1997.
 
  Since 1980, Mr. Biggs has been Chairman and a director of the Subadviser, and
a Managing Director of the Subadviser and Morgan Stanley & Co. Incorporated
since 1975. Mr. Biggs is a director of Morgan Stanley Group, Inc. and a director
and chairman of other investment companies of the Subadviser. Mr. Biggs holds a
B.A. from Yale University and an M.B.A. from New York University.
 
  Mr. Dhar is Managing Director of the Subadviser and Morgan Stanley & Co.
Incorporated. He has been with the Subadviser since 1984. Mr. Dhar is a co-head
of the Subadviser's emerging markets group, and has been involved in the
launching of the Subadviser's country funds. Mr. Dhar holds a B.S. from St.
Stephens College in Delhi University (India) and an M.B.A. from Carnegie-Mellon
University.
 
  Ms. Bovich has been with the Subadviser since 1993. She is responsible for
portfolio management and communication of the Subadviser's asset allocation
strategy to institutional investor clients. Prior to 1993, Ms. Bovich was a
Principal and Executive Vice President of Westwood Management Corp. Prior to
that, Ms. Bovich was a Managing Director of Citicorp Investment Management, Inc.
where she was responsible for the Institutional Investment Management group. Ms.
Bovich holds a B.A. in Economics from Connecticut College and an M.B.A. in
Finance from New York University.
 
  Ms. Thivierge is a Principal of the Subadviser. She is a member of MSAM asset
allocation committee, primarily representing the Total Fund Management team
since its inception in 1991. Ms. Thivierge has been with the Subadviser since
1986. Prior to 1986, Ms. Thivierge was with Edgewood Management Company. Ms.
Thivierge holds a B.A. in International Relations from James Madison College,
Michigan State University, and an M.B.A. in Finance from New York University.
 
  The Subadviser has employed J. David Germany, Michael B. Kushma, Paul E.
O'Brien and Robert M. Smith to manage the fixed income portion of the Fund's
portfolio.
 
  J. David Germany joined the Subadviser in 1996 and has been a portfolio
manager with the Adviser's affiliate, Miller Anderson & Sherrerd, LLP ("MAS")
since 1991. He was Vice President & Senior Economist for Morgan Stanley & Co.
Incorporated from 1989 to 1991. He assumed responsibility for the Global Fixed
Income and International Fixed Income Portfolios of the MAS-advised MAS Funds in
1993 and the MAS Funds' Multi-Asset-Class Portfolio in 1994. Mr. Germany was
Senior Staff Economist (International Finance and Macroeconomics) to the Council
of Economic Advisors -- Executive Office of the President from 1986 through 1987
and an Economist with the Board of Governors of the Federal Reserve System --
Division of International Finance from 1983 through 1987. He holds a A.B. degree
(Valedictorian) from Princeton University and a Ph.D. in Economics from the
Massachusetts Institute of Technology.
 
  Michael B. Kushma, a Principal at Morgan Stanley & Co. Incorporated, joined
the firm in 1987. He was a member of Morgan Stanley & Co. Incorporated's global
fixed income strategy group in the fixed income division from 1987-1995 where he
became the division's senior government bond strategist. He joined the
Subadviser in 1995 where he took responsibility for the global fixed income
portfolio. Mr. Kushma received an A.B. in economics from Princeton University in
1979, an M. Sc. in economics from the London School of Economics in 1981 and an
M.Phil. in economics from Columbia University in 1983.
 
  Paul F. O'Brien joined the Subadviser and MAS in 1996. He was head of European
Economics from 1993 through 1995 for JP Morgan and as Principal Administrator
from 1991 through 1992 for the Organization for Economic Cooperation and
Development. He assumed responsibility for the MAS-advised MAS Funds' Global
Fixed Income and International Fixed Income Portfolios in 1996. Mr. O'Brien
holds a B.S. degree from the Massachusetts Institute of Technology and a Ph.D.
in Economics from the University of Minnesota.
 
  Robert Smith, a Principal of Morgan Stanley & Co. Incorporated, joined the
Subadviser in June 1994 and has had or shared primary responsibility for
managing the Morgan Stanley Global Fixed Income Fund's assets since July 1994.
Prior to joining the Subadviser he spent eight years as Senior Portfolio Manager
- -- Fixed Income at the State of Florida Pension Fund. Mr. Smith's
responsibilities included active total-rate-of-return management of long term
portfolios and supervision of other fixed income managers. A graduate of Florida
State University with a B.S. in Business, Mr. Smith also received an M.B.A. --
Finance from Florida State University and holds a Chartered Financial Analyst
(CFA) designation.
 
                                       17
<PAGE>   18
 
- --------------------------------------------------------------------------------
ALTERNATIVE SALES ARRANGEMENTS
- --------------------------------------------------------------------------------
 
  The Alternative Sales Arrangements permits an investor to choose the method of
purchasing shares of the Fund that is most beneficial given the amount of the
purchase and the length of time the investor expects to hold the shares.
 
  CLASS A SHARES. Class A shares are sold at net asset value plus an initial
maximum sales charge of up to 4.75% of the offering price (4.99% of the net
amount invested), reduced on investments of $100,000 or more. Investments of $1
million or more are not subject to any sales charge at the time of purchase, but
a CDSC of 1.00% may be imposed on certain redemptions made within one year of
the purchase. Class A shares are subject to an ongoing service fee at an annual
rate of up to 0.25% of the Fund's aggregate average daily net assets
attributable to the Class A shares. Certain purchases of Class A shares qualify
for reduced initial sales charges. See "Purchase of Shares -- Class A Shares."
 
  CLASS B SHARES. Class B shares are sold at net asset value and are subject to
a deferred sales charge if redeemed within five years of purchase. Class B
shares are subject to an ongoing service fee at an annual rate of up to 0.25% of
the Fund's aggregate average daily net assets attributable to the Class B shares
and an ongoing distribution fee at an annual rate of up to 0.75% of the Fund's
aggregate average daily net assets attributable to the Class B shares. Class B
shares enjoy the benefit of permitting all of the investor's dollars to work
from the time the investment is made. The ongoing distribution fee paid by Class
B shares will cause such shares to have a higher expense ratio and to pay lower
dividends than those related to Class A shares. Class B shares convert
automatically to Class A shares eight years after the end of the calendar month
in which the shareholder's order to purchase was accepted. See "Purchase of
Shares -- Class B Shares."
 
  CLASS C SHARES. Class C shares are sold at net asset value and are subject to
a deferred sales charge if redeemed within one year of purchase. Class C shares
are subject to an ongoing service fee at an annual rate of up to 0.25% of the
Fund's aggregate average daily net assets attributable to the Class C shares and
an ongoing distribution fee at an annual rate of up to 0.75% of the Fund's
aggregate average daily net assets attributable to the Class C shares. Class C
shares enjoy the benefit of permitting all of the investor's dollars to work
from the time the investment is made. The ongoing distribution fee paid by Class
C shares will cause such shares to have a higher expense ratio and to pay lower
dividends than those related to Class A shares. See "Purchase of Shares -- Class
C Shares."
 
  CONVERSION FEATURE. Class B shares purchased on or after June 1, 1996, and any
dividend reinvestment plan shares received thereon, automatically convert to
Class A shares eight years after the end of the calendar month in which the
shares were purchased. Class B shares purchased before June 1, 1996, and any
dividend reinvestment plan shares received thereon, automatically convert to
Class A shares six years after the end of the calendar month in which the shares
were purchased. Class C shares purchased before January 1, 1997, and any
dividend reinvestment plan shares received thereon, automatically convert to
Class A shares ten years after the end of the calendar month in which such
shares were purchased. Such conversion will be on the basis of the relative net
asset values per share, without the imposition of any sales load, fee or other
charge. The conversion schedule applicable to a share acquired through the
exchange privilege is determined by reference to the Participating Fund (defined
below) from which such share was originally purchased. The conversion of such
shares to Class A shares is subject to the continuing availability of an opinion
of counsel to the effect that (i) the assessment of the higher distribution fee
and transfer agency costs with respect to such shares does not result in the
Fund's dividends or distributions constituting "preferential dividends" under
the Code, and (ii) the conversion of shares does not constitute a taxable event
under federal income tax law. The conversion may be suspended if such an opinion
is no longer available and such shares might continue to be subject to the
higher aggregate fees applicable to such shares for an indefinite period.
 
  FACTORS FOR CONSIDERATION. In deciding which class of shares to purchase,
investors should take into consideration their investment goals, present and
anticipated purchase amounts, time horizons and temperaments. Investors should
consider whether, during the anticipated life of their investment in the Fund,
the higher aggregate fees and CDSC on Class B shares and Class C shares would be
less than the initial sales charge on Class A shares purchased at the same time,
and to what extent such differential would be offset by the higher dividends per
share on Class A shares. To assist investors in making this determination, the
table under the caption "Annual Fund Operating Expenses and Example" sets forth
examples of the charges applicable to each class of shares. In this regard,
Class A shares may be more beneficial to the investor who qualifies for reduced
initial sales charges or purchases at net asset value. It is presently the
policy of the
 
                                       18
<PAGE>   19
 
Distributor not to accept any order of $500,000 or more for Class B shares or
any order of $1 million or more for Class C shares as it ordinarily would be
more beneficial for such an investor to purchase Class A shares.
 
  Class A shares are not subject to an ongoing distribution fee and,
accordingly, receive correspondingly higher dividends per share. However,
because initial sales charges are deducted at the time of purchase for accounts
under $1 million, investors in Class A shares do not have all their funds
invested initially and, therefore, initially own fewer shares. Other investors
might determine that it is more advantageous to purchase either Class B shares
or Class C shares and have all their funds invested initially, although
remaining subject to a CDSC. Ongoing distribution fees on Class B shares and
Class C shares may be offset to the extent of the additional funds originally
invested and any return realized on those funds. However, there can be no
assurance as to the return, if any, which will be realized on such additional
funds. For investments held for ten years or more, the relative value upon
liquidation of the three classes tends to favor Class A shares or Class B
shares, rather than Class C shares.
 
  Class A shares may be appropriate for investors who prefer to pay the sales
charge up front, want to take advantage of the reduced sales charges available
on larger investments, wish to maximize their current income from the start,
prefer not to pay redemption charges or have a longer-term investment horizon.
Class B shares may be appropriate for investors who wish to avoid a front-end
sales charge, put 100% of their investment dollars to work immediately or have a
longer-term investment horizon. Class C shares may be appropriate for investors
who wish to avoid a front-end sales charge, put 100% of their investment dollars
to work immediately, have a shorter-term investment horizon or desire a short
CDSC schedule.
 
  The distribution expenses incurred by the Distributor in connection with the
sale of the shares will be reimbursed, in the case of Class A shares, from the
proceeds of the initial sales charge and, in the case of Class B shares and
Class C shares, from the proceeds of the ongoing distribution fee and any CDSC
incurred upon redemption within five years or one year, respectively, of
purchase. Sales personnel of broker-dealers distributing the Fund's shares and
other persons entitled to receive compensation for selling such shares may
receive differing compensation for selling such shares. INVESTORS SHOULD
UNDERSTAND THAT THE PURPOSE AND FUNCTION OF THE CDSC AND ONGOING DISTRIBUTION
FEE WITH RESPECT TO THE CLASS B SHARES AND CLASS C SHARES ARE THE SAME AS THOSE
OF THE INITIAL SALES CHARGE WITH RESPECT TO CLASS A SHARES. See "Distribution
and Service Plans."
 
  GENERAL. Dividends paid by the Fund with respect to Class A shares, Class B
shares and Class C shares will be calculated in the same manner at the same time
on the same day except that the higher distribution fees and transfer agency
costs relating to Class B shares or Class C shares will be borne by the
respective class. See "Distributions from the Fund." Shares of the Fund may be
exchanged, subject to certain limitations, for shares of the same class of
certain other mutual funds advised by the Adviser and its affiliates and
distributed by the Distributor. See "Shareholder Services -- Exchange
Privilege."
 
- --------------------------------------------------------------------------------
PURCHASE OF SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
  The Fund offers three classes of shares to the public on a continuous basis
through the Distributor as principal underwriter, which is located at One
Parkview Plaza, Oakbrook Terrace, Illinois 60181. Shares also are offered
through members of the National Association of Securities Dealers, Inc. ("NASD")
who are acting as securities dealers ("dealers") and NASD members or eligible
non-NASD members who are acting as brokers or agents for investors ("brokers").
The terms "dealers" and "brokers" are sometimes referred to herein as
"authorized dealers."
 
  Initial investments must be at least $500 for each class of shares, and
subsequent investments must be at least $25 for each class of shares. Both
minimums may be waived by the Distributor for plans involving periodic
investments. Shares of the Fund may be sold in foreign countries where
permissible. The Fund and the Distributor reserve the right to refuse any order
for the purchase of shares. The Fund also reserves the right to suspend the sale
of the Fund's shares in response to conditions in the securities markets or for
other reasons.
 
  Shares of the Fund may be purchased on any business day through authorized
dealers. Shares also may be purchased by completing the application accompanying
this Prospectus and forwarding the application, through the authorized dealer,
to the shareholder service agent, Van Kampen Investor Services Inc. ("Investor
Services"), a wholly-owned subsidiary of
 
                                       19
<PAGE>   20
 
Van Kampen. When purchasing shares of the Fund, investors must specify whether
the purchase is for Class A shares, Class B shares or Class C shares.
 
  Shares are offered at the next determined net asset value per share, plus a
front-end or deferred sales charge depending on the class of shares chosen by
the investor, as shown in the tables herein. Net asset value per share for each
class is determined once daily as of the close of trading on the New York Stock
Exchange (the "Exchange") (currently 4:00 p.m., New York time) each day the
Exchange is open. Net asset value per share for each class is determined by
dividing the value of the Fund's securities, cash and other assets (including
accrued interest) attributable to such class less all liabilities (including
accrued expenses) attributable to such class, by the total number of shares of
the class outstanding.
 
  Equity securities listed or traded on a national securities exchange are
valued at the last sale price. Unlisted equity securities and listed equity
securities for which the last sales price is not available are valued at the
most recent bid price. The net asset value of debt securities is computed by (i)
valuing long-term debt obligations at the mean of representative quoted bid or
asked prices for such securities or, if such prices are not available, at prices
for securities of comparable maturity, quality and type, however, when the
Advisers deem it appropriate, prices obtained for the day of valuation from a
bond pricing service will be used, (ii) valuing short-term debt obligations with
remaining maturities in excess of 60 days at the mean of representative quoted
bid and asked prices for such securities or, if such prices are not available,
using the prices for securities of comparable maturity, quality and type, and
(iii) valuing short-term debt securities with 60 days or less remaining to
maturity by amortizing such securities to maturity based on their cost to the
Fund. Options and futures contracts and options on futures contracts which are
traded on exchanges are valued at their last sale or settlement price as of the
close of such exchanges, or, if no sales are reported, at the mean between the
last reported bid and asked prices. Over-the-counter options are valued at the
average of the last bid prices obtained from dealers. Any other assets will be
valued at fair value as determined in good faith by the Adviser based on
procedures approved by the Trustees of the Fund.
 
  Generally, the net asset values per share of the Class A shares, Class B
shares and Class C shares are expected to be substantially the same. Under
certain circumstances, however, the per share net asset values of the Class A
shares, Class B shares and Class C shares may differ from one another,
reflecting the daily expense accruals of the higher distribution fee and
transfer agency costs applicable with respect to the Class B shares and Class C
shares and the differential in the dividends paid on the classes of shares. The
price paid for shares purchased is based on the next calculation of net asset
value (plus sales charges, where applicable) after an order is received by an
authorized dealer provided such order is transmitted to the Distributor prior to
the Distributor's close of business on such day. Orders received by authorized
dealers after the close of the Exchange are priced based on the next close
provided they are received by the Distributor prior to the Distributor's close
of business on such day. It is the responsibility of authorized dealers to
transmit orders received by them to the Distributor so they will be received
prior to such time. Orders of less than $500 are mailed by the authorized dealer
and processed at the offering price next calculated after acceptance by Investor
Services.
 
  Each class of shares represents an interest in the same portfolio of
investments of the Fund and has the same rights, except that (i) Class B shares
and Class C shares bear the expenses of the deferred sales arrangement and any
expenses (including the higher distribution fee and transfer agency costs)
resulting from such sales arrangement, (ii) generally, each class has exclusive
voting rights with respect to approvals of the Rule 12b-1 distribution plan
pursuant to which its distribution fee or service fee is paid, (iii) each class
of shares has different exchange privileges, (iv) certain classes of shares are
subject to a conversion feature and (v) certain classes of shares have different
shareholder service options available. The net income attributable to Class B
shares and Class C shares and the dividends payable on Class B shares and Class
C shares will be reduced by the amount of the distribution fee and other
expenses associated with such shares. Sales personnel of authorized dealers
distributing the Fund's shares and other persons entitled to receive
compensation for selling such shares may receive differing compensation for
selling Class A shares, Class B shares or Class C shares.
 
  The Distributor may from time to time implement programs under which an
authorized dealer's sales force may be eligible to win nominal awards for
certain sales efforts or under which the Distributor will reallow to any
authorized dealer that sponsors sales contests or recognition programs
conforming to criteria established by the Distributor, or participates in sales
programs sponsored by the Distributor, an amount not exceeding the total
applicable sales charges on the sales generated by the authorized dealer at the
public offering price during such programs. Other programs provide, among other
things and subject to certain conditions, for certain favorable distribution
arrangements for shares of the Fund. Also, the Distributor in its discretion may
from time to time, pursuant to objective criteria established by the
Distributor, pay fees to, and sponsor business seminars for, qualifying
authorized dealers for certain services or activities which are
 
                                       20
<PAGE>   21
 
primarily intended to result in sales of shares of the Fund. Fees may include
payment for travel expenses, including lodging, incurred in connection with
trips taken by invited registered representatives and members of their families
to locations within or outside of the United States for meetings or seminars of
a business nature. In some instances additional compensation or promotional
incentives may be offered to brokers, dealers or financial intermediaries that
have sold or may sell significant amounts of shares during specified periods of
time. The Distributor may provide additional compensation to Edward D. Jones &
Co. or an affiliate thereof based on a combination of its sales of shares and
increases in assets under management. All of the foregoing payments are made by
the Distributor out of its own assets. Such fees paid for such services and
activities with respect to the Fund will not exceed in the aggregate 1.25% of
the average total daily net assets of the Fund on an annual basis. These
programs will not change the price an investor will pay for shares or the amount
that the Fund will receive from such sale.
 
CLASS A SHARES
 
  The public offering price of Class A shares is the next determined net asset
value plus a sales charge, as set forth herein.
 
SALES CHARGE TABLE
 
<TABLE>
<CAPTION>
                                                                                                  REALLOWED
                                                                                  AS % OF        TO DEALERS
                                                                 AS % OF        NET AMOUNT       (AS A % OF
                     SIZE OF INVESTMENT                       OFFERING PRICE     INVESTED      OFFERING PRICE)
<S>                                                           <C>             <C>              <C>
- --------------------------------------------------------------------------------------------------------------
Less than $100,000..........................................     4.75%             4.99%           4.25%
$100,000 but less than $250,000.............................     3.75%             3.90%           3.25%
$250,000 but less than $500,000.............................     2.75%             2.83%           2.25%
$500,000 but less than $1,000,000...........................     2.00%             2.04%           1.75%
$1,000,000 or more*.........................................       *                 *               *
- --------------------------------------------------------------------------------------------------------------
</TABLE>
 
* No sales charge is payable at the time of purchase on investments of $1
  million or more, although for such investments the Fund imposes a CDSC of
  1.00% on redemptions made within one year of the purchase. A commission will
  be paid to authorized dealers who initiate and are responsible for purchases
  of $1 million or more as follows: 1.00% on sales to $2 million, plus 0.80% on
  the next $1 million and 0.50% on the excess over $3 million.
 
  In addition to the reallowances from the applicable public offering price
described herein, the Distributor may, from time to time, pay or allow
additional reallowances or promotional incentives, in the form of cash or other
compensation, to authorized dealers that sell shares of the Fund. Authorized
dealers which are reallowed all or substantially all of the sales charges may be
deemed to be underwriters for purposes of the 1933 Act.
 
  The Distributor may also pay financial institutions (which may include banks)
and other industry professionals that provide services to facilitate
transactions in shares of the Fund for their clients a transaction fee up to the
level of the reallowance allowable to authorized dealers described herein. Such
financial institutions, other industry professionals and authorized dealers are
hereinafter referred to as "Service Organizations." Banks are currently
prohibited from providing certain underwriting or distribution services. If
banking firms were prohibited from acting in any capacity or providing any of
the described services, the Distributor would consider what action, if any,
would be appropriate. The Distributor does not believe that termination of a
relationship with a bank would result in any material adverse consequences to
the Fund. State securities laws regarding registration of banks and other
financial institutions may differ from the interpretation of federal law
expressed herein and banks and other financial institutions may be required to
register as dealers pursuant to certain state laws.
 
QUANTITY DISCOUNTS
 
  Investors purchasing Class A shares may under certain circumstances be
entitled to pay reduced sales charges. The circumstances under which such
investors may pay reduced sales charges are described below.
 
  Investors or their authorized dealers must notify the Fund at the time of the
purchase order whenever a quantity discount is applicable to purchases. Upon
such notification, an investor will receive the lowest applicable sales charge.
Quantity discounts may be modified or terminated at any time. For more
information about quantity discounts, investors should contact their authorized
dealers or the Distributor.
 
                                       21
<PAGE>   22
 
  A person eligible for a reduced sales charge includes an individual, his or
her spouse and children under 21 years of age and any corporation, partnership
or sole proprietorship which is 100% owned, either alone or in combination, by
any of the foregoing; a trustee or other fiduciary purchasing for a single trust
or for a single fiduciary account, or a "company" as defined in Section 2(a)(8)
of the 1940 Act.
 
  As used herein, "Participating Funds" refers to certain open-end investment
companies advised by the Adviser or Advisory Corp. and distributed by the
Distributor as determined from time to time by the Fund's Board of Trustees.
 
  VOLUME DISCOUNTS. The size of investment shown in the preceding sales charge
table applies to the total dollar amount being invested by any person in shares
of the Fund, or in any combination of shares of the Fund and shares of other
Participating Funds, although other Participating Funds may have different sales
charges.
 
  CUMULATIVE PURCHASE DISCOUNT. The size of investment shown in the preceding
sales charge table may also be determined by combining the amount being invested
in shares of the Participating Funds plus the current offering price of all
shares of the Participating Funds which have been previously purchased and are
still owned.
 
  LETTER OF INTENT. A Letter of Intent provides an opportunity for an investor
to obtain a reduced sales charge by aggregating the investments over a
thirteen-month period to determine the sales charge as outlined in the preceding
sales charge table. The size of investment shown in the preceding sales charge
table also includes purchases of shares of the Participating Funds over a
thirteen-month period based on the total amount of intended purchases plus the
value of all shares of the Participating Funds previously purchased and still
owned. An investor may elect to compute the thirteen-month period starting up to
90 days before the date of execution of a Letter of Intent. Each investment made
during the period receives the reduced sales charge applicable to the total
amount of the investment goal. If the goal is not achieved within the period,
the investor must pay the difference between the sales charges applicable to the
purchases made and the sales charges previously paid. The initial purchase must
be for an amount equal to at least 5% of the minimum total purchase amount of
the level selected. If trades not initially made under a Letter of Intent
subsequently qualify for a lower sales charge through the 90-day back-dating
provisions, an adjustment will be made at the expiration of the Letter of Intent
to give effect to the lower charge. Such adjustments in sales charge will be
used to purchase additional shares for the shareholder at the applicable
discount category. Additional information is contained in the application form
accompanying this Prospectus.
 
OTHER PURCHASE PROGRAMS
 
  Purchasers of Class A shares may be entitled to reduced initial sales charges
in connection with unit investment trust reinvestment programs and purchases by
registered representatives of selling firms or purchases by persons affiliated
with the Fund or the Distributor. The Fund reserves the right to modify or
terminate these arrangements at any time.
 
  Unit Investment Trust Reinvestment Programs.  The Fund permits unitholders of
unit investment trusts to reinvest distributions from such trusts in Class A
shares of the Fund at net asset value, and with no minimum initial or subsequent
investment requirement if the administrator of an investor's unit investment
trust program meets certain uniform criteria relating to cost savings by the
Fund and the Distributor. The total sales charge for all other investments made
from unit trust distributions will be 1.00% of the offering price (1.01% of net
asset value). Of this amount, the Distributor will pay to the authorized dealer,
if any, through which such participation in the qualifying program was initiated
0.50% of the offering price as a dealer concession or agency commission. Persons
desiring more information with respect to this program, including the applicable
terms and conditions thereof, should contact their authorized dealer or the
Distributor.
 
  The administrator of such a unit investment trust must have an agreement with
the Distributor pursuant to which the administrator will (1) submit a single
bulk order and make payment with a single remittance for all investments in the
Fund during each distribution period by all investors who choose to invest in
the Fund through the program and (2) provide Investor Services with appropriate
backup data for each participating investor in a computerized format fully
compatible with Investor Services' processing system.
 
  As further requirements for obtaining these special benefits, the Fund also
requires that all dividends and other distributions by the Fund be reinvested in
additional shares without any systematic withdrawal program. There will be no
minimum for reinvestments from unit investment trusts. The Fund will send
account activity statements to such participants on a monthly basis only, even
if their investments are made more frequently. The Fund reserves the right to
modify or terminate this program at any time.
                                       22
<PAGE>   23
 
  NAV Purchase Options. Class A shares of the Fund may be purchased at net asset
value, upon written assurance that the purchase is made for investment purposes
and that the shares will not be resold except through redemption by the Fund,
by:
 
  (1) Current or retired trustees or directors of funds advised by the Adviser
      or Advisory Corp. and such persons' families and their beneficial
      accounts.
 
  (2) Current or retired directors, officers and employees of Morgan Stanley
      Group Inc. and any of its subsidiaries, employees of an investment
      subadviser to any fund described in (1) above or an affiliate of such
      subadviser, and such persons' families and their beneficial accounts.
 
  (3) Directors, officers, employees and, when permitted, registered
      representatives of financial institutions that have a selling group
      agreement with the Distributor and their spouses and children under 21
      years of age when purchasing for any accounts they beneficially own, or,
      in the case of any such financial institution, when purchasing for
      retirement plans for such institution's employees, provided that such
      purchases are otherwise permitted by such institutions.
 
  (4) Registered investment advisers who charge a fee for their services, trust
      companies and bank trust departments investing on their own behalf or on
      behalf of their clients. The Distributor may pay Participating Dealers
      through which purchases are made an amount up to 0.50% of the amount
      invested over a twelve month period.
 
  (5) Trustees and other fiduciaries purchasing shares for retirement plans of
      organizations which invest in multiple fund families through broker-dealer
      retirement plan alliance programs that have entered into agreements with
      the Distributor and which are subject to certain minimum size and
      operational requirements. Trustees and other fiduciaries should refer to
      the Statement of Additional Information for further details with respect
      to such alliance programs.
 
  (6) Beneficial owners of shares of Participating Funds held by a retirement
      plan or held in a tax-advantaged retirement account who purchase shares of
      the Fund with proceeds from distributions from such a plan or retirement
      account other than distributions taken to correct an excess contribution.
 
  (7) Accounts as to which a bank or broker-dealer charges an account management
      fee ("wrap accounts"), provided the bank or broker-dealer has a separate
      agreement with the Distributor.
 
  (8) Trusts created under pension, profit sharing or other employee benefit
      plans qualified under Section 401(a) of the Code, or custodial accounts
      held by a bank created pursuant to Section 403(b) of the Code and
      sponsored by non-profit organizations defined under Section 501(c)(3) of
      the Code and assets held by an employer or trustee in connection with an
      eligible deferred compensation plan under Section 457 of the Code. Such
      plans will qualify for purchases at net asset value provided, for plans
      initially establishing accounts with the Distributor in the Participating
      Funds after February 1, 1997, that (1) the initial amount invested in the
      Participating Funds is at least $500,000 or (2) such shares are purchased
      by an employer sponsored plan with more than 100 eligible employees. Such
      plans that have been established with a Participating Fund or have
      received proposals from the Distributor prior to February 1, 1997 based on
      net asset value purchase privileges previously in effect will be qualified
      to purchase shares of the Participating Funds at net asset value for
      accounts established on or before May 1, 1997. Section 403(b) and similar
      accounts for which Van Kampen Trust Company served as custodian will not
      be eligible for net asset value purchases based on the aggregate
      investment made by the plan or the number of eligible employees, except
      under certain uniform criteria established by the Distributor from time to
      time. Prior to February 1, 1997, a commission will be paid to authorized
      dealers who initiate and are responsible for such purchases within a
      rolling twelve-month period as follows: 1.00% on sales to $5 million, plus
      0.50% on the next $5 million and 0.25% on the excess over $10 million. For
      purchases on February 1, 1997 and thereafter, a commission will be paid as
      follows: 1.00% on sales to $2 million, plus 0.80% on the next $1 million,
      plus 0.50% on the next $47 million and 0.25% on the excess over $50
      million.
 
  (9) Individuals who are members of a "qualified group". For this purpose, a
      qualified group is one which (i) has been in existence for more than six
      months, (ii) has a purpose other than to acquire shares of the Fund or
      similar investments, (iii) has given and continues to give its endorsement
      or authorization, on behalf of the group, for purchase of shares of the
      Fund and other Participating Funds, (iv) has a membership that the
      authorized dealer
 
                                       23
<PAGE>   24
 
      can certify as to the group's members and (v) satisfies other uniform
      criteria established by the Distributor for the purpose of realizing
      economies of scale in distributing such shares. A qualified group does not
      include one whose sole organizational nexus, for example, is that its
      participants are credit card holders of the same institution, policy
      holders of an insurance company, customers of a bank or broker-dealer,
      clients of an investment adviser or other similar groups. Shares purchased
      in each group's participants account in connection with this privilege
      will be subject to a CDSC of 1.00% in the event of redemption within one
      year of purchase, and a commission will be paid to authorized dealers who
      initiate and are responsible for such sales to each individual as follows:
      1.00% on sales to $2 million, plus 0.80% on the next $1 million and 0.50%
      on the excess over $3 million.
 
  The term "families" includes a person's spouse, children under 21 years of age
and grandchildren, parents, and a person's spouse's parents.
 
  Purchase orders made pursuant to clause (4) may be placed either through
authorized dealers as described above or directly with Investor Services by the
investment adviser, trust company or bank trust department, provided that
Investor Services receives federal funds for the purchase by the close of
business on the next business day following acceptance of the order. An
authorized dealer may charge a transaction fee for placing an order to purchase
shares pursuant to this provision or for placing a redemption order with respect
to such shares. Authorized dealers will be paid a service fee as described
herein under "Distribution and Service Plans" on purchases made as described in
(3) through (9) above. The Fund may terminate, or amend the terms of, offering
shares of the Fund at net asset value to such groups at any time.
 
CLASS B SHARES
 
  Class B shares are offered at net asset value. Class B shares which are
redeemed within five years of purchase are subject to a CDSC at the rates set
forth in the following table charged as a percentage of the dollar amount
subject thereto. The charge is assessed on an amount equal to the lesser of the
then current market value or the cost of the shares being redeemed. Accordingly,
no sales charge is imposed on increases in net asset value above the initial
purchase price. In addition, no charge is assessed on shares derived from
reinvestment of dividends or capital gains distributions. It is presently the
policy of the Distributor not to accept any order for Class B shares in an
amount of $500,000 or more because it ordinarily will be more advantageous for
an investor making such an investment to purchase Class A shares.
 
  The amount of the CDSC, if any, varies depending on the number of years from
the time of payment for the purchase of Class B shares until the time of
redemption of such shares. Solely for purposes of determining the number of
years from the time of any payment for the purchases of shares, all payments
during a month are aggregated and deemed to have been made on the last day of
the month.
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                              CONTINGENT DEFERRED SALES CHARGE
                                                                     AS A PERCENTAGE OF
YEAR SINCE PURCHASE                                           DOLLAR AMOUNT SUBJECT TO CHARGE
- ----------------------------------------------------------------------------------------------
<S>                                                           <C>
First.......................................................               4.00%
Second......................................................               4.00%
Third.......................................................               3.00%
Fourth......................................................               2.50%
Fifth.......................................................               1.50%
Sixth.......................................................                None
</TABLE>
 
- --------------------------------------------------------------------------------
 
  In determining whether a CDSC is applicable to a redemption, it is assumed
that the redemption is first of any shares in the shareholder's Fund account
that are not subject to a CDSC, second of shares held for over five years and
third of shares held longest during the five year period.
 
  To provide an example, assume an investor purchased 100 shares at $10 per
share (at a cost of $1,000) and in the second year after purchase, the net asset
value per share is $12 and, during such time, the investor has acquired 10
additional shares upon dividend reinvestment. If at such time the investor makes
his or her first redemption of 50 shares (proceeds of $600), 10 shares will not
be subject to charge because of dividend reinvestment. With respect to the
remaining 40 shares, the charge is applied only to the original cost of $10 per
share and not to the increase in net asset
 
                                       24
<PAGE>   25
 
value of $2 per share. Therefore, $400 of the $600 redemption proceeds is
subject to a deferred sales charge at a rate of 4.00% (the applicable rate in
the second year after purchase).
 
  A commission or transaction fee of 4.00% of the purchase amount will be paid
to authorized dealers at the time of purchase. Additionally, the Distributor
may, from time to time, pay additional promotional incentives in the form of
cash or other compensation to authorized dealers that sell Class B shares of the
Fund.
 
CLASS C SHARES
 
  Class C shares are offered at net asset value. Class C shares which are
redeemed within the first year of purchase are subject to a CDSC of 1.00%. The
charge is assessed on an amount equal to the lesser of the then current market
value or the cost of the shares being redeemed. Accordingly, no sales charge is
imposed on increases in net asset value above the initial purchase price. In
addition, no charge is assessed on shares derived from reinvestment of dividends
or capital gains distributions. It is presently the policy of the Distributor
not to accept any order for Class C shares in an amount of $1 million or more
because it ordinarily will be more advantageous for an investor making such an
investment to buy Class A shares.
 
  In determining whether a CDSC is applicable to a redemption it is assumed that
the redemption is first of any shares in the shareholder's Fund account that are
not subject to a CDSC and second of shares held for more than one year or shares
acquired pursuant to reinvestment of dividends or distributions.
 
  A commission or transaction fee of up to 1.00% of the purchase amount will
generally be paid to authorized dealers at the time of purchase. Authorized
dealers also will be paid ongoing commissions and transaction fees of up to
0.75% of the average daily net assets of the Fund's Class C shares annually
commencing in the second year after purchase. Additionally, the Distributor may,
from time to time, pay additional promotional incentives in the form of cash or
other compensation to authorized dealers that sell Class C shares of the Fund.
 
WAIVER OF CONTINGENT DEFERRED SALES CHARGE
 
  The CDSC is waived on redemptions of Class B shares and Class C shares (i)
following the death or disability (as defined in the Code) of a shareholder,
(ii) in connection with required minimum distributions from an IRA or other
retirement plan, (iii) pursuant to the Fund's systematic withdrawal plan but
limited to 12% annually of the initial value of the account, (iv) in
circumstances under which no commissions or transaction fee is paid to
authorized dealers at the time of purchase of such shares, and (v) effected
pursuant to the right of the Fund to liquidate a shareholder's account as
described herein under "Redemption of Shares." The CDSC also is waived on
redemptions of Class C shares as it relates to the reinvestment of redemption
proceeds in shares of the same class of the Fund within 180 days after
redemption. See the Statement of Additional Information for further discussion
of waiver provisions.
 
- --------------------------------------------------------------------------------
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
  The Fund offers a number of shareholder services designed to facilitate
investments in its shares at little or no extra cost to the investor. Below is a
description of such services.
 
  INVESTMENT ACCOUNT. Each shareholder has an investment account under which the
investor's shares of the Fund are held by Investor Services, the Fund's transfer
agent. Investor Services performs bookkeeping, data processing and
administration services related to the maintenance of shareholder accounts.
Except as described in this Prospectus, after each share transaction in an
account, the shareholder receives a statement showing the activity in the
account. Each shareholder who has an account in certain of the Participating
Funds will receive quarterly statements from Investor Services showing any
reinvestments of dividends and capital gains distributions and any other
activity in the account since the preceding statement. Such shareholders also
will receive separate confirmations for each purchase or sale transaction other
than reinvestment of dividends and capital gains distributions and systematic
purchases or redemptions. Additions to an investment account may be made at any
time by purchasing shares through authorized dealers or by mailing a check
directly to Investor Services.
 
                                       25
<PAGE>   26
 
  SHARE CERTIFICATES. Generally, the Fund will not issue share certificates.
However, upon written or telephone request to the Fund, a share certificate will
be issued representing shares (with the exception of fractional shares) of the
Fund. A shareholder will be required to surrender such certificates upon
redemption thereof. In addition, if such certificates are lost the shareholder
must write to Van Kampen Funds, c/o Van Kampen Investor Services Inc., P.O. Box
418256, Kansas City, MO 64141-9256, requesting an "affidavit of loss" and obtain
a Surety Bond in a form acceptable to Investor Services. On the date the letter
is received Investor Services will calculate a fee for replacing the lost
certificates equal to no more than 2.00% of the net asset value of the issued
shares, and bill the party to whom the replacement certificate was mailed.
 
  REINVESTMENT PLAN. A convenient way for investors to accumulate additional
shares is by accepting dividends and capital gains distributions in shares of
the Fund. Such shares are acquired at net asset value per share (without sales
charge) on the record date. Unless the shareholder instructs Investor Services
otherwise, the reinvestment plan is automatic. This instruction may be made by
telephone by calling (800) 341-2911, ((800) 421-2833 for the hearing impaired)
or in writing to Investor Services. The investor may, on the initial application
or prior to any declaration, instruct that dividends be paid in cash and capital
gains distributions be reinvested at net asset value, or that both dividends and
capital gains distributions be paid in cash.
 
  AUTOMATIC INVESTMENT PLAN. An automatic investment plan is available under
which a shareholder can authorize Investor Services to debit a bank account on a
regular basis to invest predetermined amounts in the Fund. Additional
information is available from the Distributor or authorized dealers.
 
  RETIREMENT PLANS. Eligible investors may establish individual retirement
accounts ("IRAs"); SEP; 401(k) plans; Section 403(b)(7) plans in the case of
employees of public school systems and certain non-profit organizations; or
other pension or profit sharing plans. Documents and forms containing detailed
information regarding these plans are available from the Distributor. Van Kampen
Trust Company serves as custodian under the IRA, 403(b)(7) and Keogh plans.
Details regarding fees, as well as full plan administration for profit sharing,
pension and 401(k) plans, are available from the Distributor.
 
  AUTOMATED CLEARING HOUSE ("ACH") DEPOSITS. Holders of Class A shares can use
ACH to have redemption proceeds deposited electronically into their bank
accounts. Redemptions transferred to a bank account via the ACH plan are
available to be credited to the account on the second business day following
normal payment. In order to utilize this option, the shareholder's bank must be
a member of ACH. In addition, the shareholder must fill out the appropriate
section of the account application. The shareholder must also include a voided
check or deposit slip from the bank account into which redemptions are to be
deposited together with the completed application. Once Investor Services has
received the application and the voided check or deposit slip, such
shareholder's designated bank account, following any redemption, will be
credited with the proceeds of such redemption. Once enrolled in the ACH plan, a
shareholder may terminate participation at any time by writing Investor
Services.
 
  DIVIDEND DIVERSIFICATION. A shareholder may, upon written request or by
completing the appropriate section of the application accompanying this
Prospectus or by calling (800) 341-2911 ((800) 421-2833 for the hearing
impaired), elect to have all dividends and other distributions paid on a class
of shares of the Fund invested into shares of the same class of any
Participating Fund so long as the investor has a pre-existing account for such
class of shares of the other fund. Both accounts must be of the same type,
either non-retirement or retirement. If the accounts are retirement accounts,
they must both be for the same class and of the same type of retirement plan
(e.g. IRA, 403(b)(7), 401(k), Keogh) and for the benefit of the same individual.
If a qualified, pre-existing account does not exist, the shareholder must
establish a new account subject to minimum investment and other requirements of
the fund into which distributions would be invested. Distributions are invested
into the selected fund at its net asset value as of the payable date of the
distribution.
 
  EXCHANGE PRIVILEGE. Shares of the Fund may be exchanged for shares of the same
class of any Participating Fund based on the next computed net asset values of
each fund after requesting the exchange without any sales charge, subject to
certain limitations. Shares of the Fund may be exchanged for shares of any other
Participating Fund only if shares of that Participating Fund are available for
sale; however, during periods of suspension of sales, shares of the
Participating Fund may be available for sale only to existing shareholders of
the Participating Fund. Shareholders seeking an exchange into a Participating
Fund should obtain and read the current prospectus for such fund.
 
                                       26
<PAGE>   27
 
  To be eligible for exchange, shares of the Fund must have been registered in
the shareholder's name for at least 30 days. Shares of the Fund registered in a
shareholder's name for less than 30 days may be exchanged upon receipt of prior
approval of the Adviser. It is the policy of the Adviser, under normal
circumstances, not to approve such requests.
 
  When Class B shares and Class C shares are exchanged among Participating
Funds, the holding period for purposes of computing the CDSC is based upon the
date of the initial purchase of such shares from a Participating Fund. If such
Class B or Class C shares are redeemed and not exchanged for shares of another
Participating Fund, such Class B or Class C shares are subject to the CDSC
schedule imposed by the Participating Fund from which such shares were
originally purchased.
 
  Exchanges of shares are sales and may result in a gain or loss for federal
income tax purposes. If the shares exchanged have been held for less than 91
days, the sales charge paid on such shares is carried over and included in the
tax basis of the shares acquired.
 
  A shareholder wishing to make an exchange may do so by sending a written
request to Investor Services or by contacting the telephone transaction line at
(800) 421-5684. A shareholder automatically has telephone exchange privileges
unless otherwise designated in the application form accompanying this
Prospectus. Van Kampen and its subsidiaries, including Investor Services
(collectively "VK"), and the Fund employ procedures considered by them to be
reasonable to confirm that instructions communicated by telephone are genuine.
Such procedures include requiring certain personal identification information
prior to acting upon telephone instructions, tape recording telephone
communications, and providing written confirmation of instructions communicated
by telephone. If reasonable procedures are employed, neither VK nor the Fund
will be liable for following telephone instructions which it reasonably believes
to be genuine. VK and the Fund may be liable for any losses due to unauthorized
or fraudulent instructions if reasonable procedures are not followed. If the
exchanging shareholder does not have an account in the fund whose shares are
being acquired, a new account will be established with the same registration,
dividend and capital gain options (except dividend diversification) and
authorized dealer of record as the account from which shares are exchanged,
unless otherwise specified by the shareholder. In order to establish a
systematic withdrawal plan for the new account or reinvest dividends from the
new account into another fund, however, an exchanging shareholder must file a
specific written request. The Fund reserves the right to reject any order to
acquire its shares through exchange. In addition, the Fund may modify, restrict
or terminate the exchange privilege at any time on 60 days' notice to its
shareholders of any termination or material amendment.
 
  A prospectus of any of these mutual funds may be obtained from any authorized
dealer or the Distributor. An investor considering an exchange to one of such
funds should refer to the prospectus for additional information regarding such
fund prior to investing.
 
  SYSTEMATIC WITHDRAWAL PLAN. Any investor whose shares in a single account
total $10,000 or more at the offering price next computed after receipt of
instructions may establish a monthly, quarterly, semi-annual or annual
withdrawal plan. Any investor whose shares in a single account total $5,000 or
more at the offering price next computed after receipt of instructions may
establish a quarterly, semi-annual or annual withdrawal plan. This plan provides
for the orderly use of the entire account, not only the income but also the
capital, if necessary. Each withdrawal constitutes a redemption of shares on
which any capital gain or loss will be recognized. The planholder may arrange
for monthly, quarterly, semi-annual or annual checks in any amount not less than
$25. Such a systematic withdrawal plan may also be maintained by an investor
purchasing Class B shares for a retirement plan established on a form made
available by the Fund. See "Shareholder Services -- Retirement Plans."
 
  Class B shareholders and Class C shareholders who establish a withdrawal plan
may redeem up to 12% annually of the shareholder's initial account balance
without incurring a CDSC. Initial account balance means the amount of the
shareholder's investment at the time the election to participate in the plan is
made.
 
  Under the plan, sufficient shares of the Fund are redeemed to provide the
amount of the periodic withdrawal payment. Dividends and capital gains
distributions on shares held under the plan are reinvested in additional shares
at the next determined net asset value. If periodic withdrawals continuously
exceed reinvested dividends and capital gains distributions, the shareholder's
original investment will be correspondingly reduced and ultimately exhausted.
Withdrawals made concurrently with the purchase of additional shares ordinarily
will be disadvantageous to the shareholder because of the duplication of sales
charges. Any gain or loss realized by the shareholder upon redemption of shares
is a taxable event.
 
                                       27
<PAGE>   28
 
  INTERNET TRANSACTIONS. In addition to performing transactions on your account
through written instruction or by telephone, you may also perform certain
transactions through the Internet. Please refer to our web site at www.van-
kampen.com for further instruction. VK and the Fund employ procedures considered
by them to be reasonable to confirm that instructions communicated through the
Internet are genuine. Such procedures include requiring use of a personal
identification number prior to acting upon Internet instructions and providing
written confirmation of instructions communicated through the Internet. If
reasonable procedures are employed, neither VK nor the Fund will be liable for
following instructions through the Internet which it reasonably believes to be
genuine. If an account has multiple owners, Investor Services may rely on the
instructions of any one owner.
 
- --------------------------------------------------------------------------------
REDEMPTION OF SHARES
- --------------------------------------------------------------------------------
 
  REGULAR REDEMPTIONS. Shareholders may redeem for cash some or all of their
shares of the Fund at any time. To do so, a written request in proper form must
be sent directly to Van Kampen Investor Services Inc., P.O. Box 418256, Kansas
City, Missouri 64141-9256. Shareholders may also place redemption requests
through an authorized dealer. Orders received from authorized dealers must be at
least $500 unless transmitted via the FUNDSERV network. The redemption price for
such shares is the net asset value next calculated after an order is received by
an authorized dealer provided such order is transmitted to the Distributor prior
to the Distributor's close of business on such day. It is the responsibility of
authorized dealers to transmit redemption requests received by them to the
Distributor so they will be received prior to such time.
 
  As described herein under "Purchase of Shares," redemptions of Class B shares
or Class C shares are subject to a CDSC. In addition, a CDSC of 1.00% may be
imposed on certain redemptions of Class A shares made within one year of
purchase for investments of $1 million or more. The CDSC incurred upon
redemption is paid to the Distributor in reimbursement for distribution-related
expenses. A custodian of a retirement plan account may charge fees based on the
custodian's fee schedule.
 
  The request for redemption must be signed by all persons in whose names the
shares are registered. Signatures must conform exactly to the account
registration. If the proceeds of the redemption exceed $50,000, or if the
proceeds are not to be paid to the record owner at the record address, or if the
record address has changed within the previous 30 days, signature(s) must be
guaranteed by one of the following: a bank or trust company; a broker-dealer; a
credit union; a national securities exchange, registered securities association
or clearing agency; a savings and loan association; or a federal savings bank.
 
  Generally, a properly signed written request with any required signature
guarantee is all that is required for a redemption. In some cases, however,
other documents may be necessary. For example, although the Fund normally does
not issue certificates for shares, it will do so if a special request has been
made to Investor Services. In the case of shareholders holding certificates, the
certificates for the shares being redeemed must accompany the redemption
request. In the event the redemption is requested by a corporation, partnership,
trust, fiduciary, executor or administrator, and the name and title of the
individual(s) authorizing such redemption is not shown in the account
registration, a copy of the corporate resolution or other legal documentation
appointing the authorized signer and certified within the prior 120 days must
accompany the redemption request. IRA redemption requests should be sent to the
IRA custodian to be forwarded to Investor Services. Where Van Kampen Trust
Company serves as IRA custodian, special IRA, 403(b)(7), or Keogh distribution
forms must be obtained from and be forwarded to Van Kampen Trust Company, P.O.
Box 944, Houston, Texas 77001-0944. Contact the custodian for information.
 
  In the case of redemption requests sent directly to Investor Services, the
redemption price is the net asset value per share next determined after the
request is received in proper form. Payment for shares redeemed will be made by
check mailed within seven days after acceptance by Investor Services of the
request and any other necessary documents in proper order. Such payment may be
postponed or the right of redemption suspended as provided by the rules of the
SEC. If the shares to be redeemed have been recently purchased by check,
Investor Services may delay mailing a redemption check until it confirms the
purchase check has cleared, which may take up to fifteen days. A taxable gain or
loss will be recognized by the shareholder upon redemption of shares.
 
  TELEPHONE REDEMPTIONS. In addition to the regular redemption procedures set
forth above, the Fund permits redemption of shares by telephone and for
redemption proceeds to be sent to the address of record for the account or to
the
 
                                       28
<PAGE>   29
 
bank account of record as described below. To establish such privilege a
shareholder must complete the appropriate section of the application
accompanying this Prospectus or call the Fund at (800) 341-2911 to request that
a copy of the Telephone Redemption Authorization form be sent to them for
completion. To redeem shares, contact the telephone transaction line at (800)
421-5684. VK and the Fund employ procedures considered by them to be reasonable
to confirm that instructions communicated by telephone are genuine. Such
procedures include requiring certain personal identification information prior
to acting upon telephone instructions, tape recording telephone communications
and providing written confirmation of instructions communicated by telephone. If
reasonable procedures are employed, neither VK nor the Fund will be liable for
following telephone instructions which it reasonably believes to be genuine. VK
and the Fund may be liable for any losses due to unauthorized or fraudulent
instructions if reasonable procedures are not followed. Investor Services will
record any calls. Telephone redemptions may not be available if the shareholder
cannot reach Investor Services by telephone, whether because all telephone lines
are busy or for any other reason; in such case, a shareholder would have to use
the Fund's regular redemption procedure previously described. Requests received
by Investor Services prior to 4:00 p.m., New York time, on a regular business
day will be processed at the net asset value per share determined that day.
These privileges are available for all accounts other than retirement accounts.
The telephone redemption privilege is not available for shares represented by
certificates. If an account has multiple owners, Investor Services may rely on
the instructions of any one owner.
 
  For redemptions authorized by telephone, amounts of $50,000 or less may be
redeemed daily if the proceeds are to be paid by check and amounts of at least
$1,000 up to $1 million may be redeemed daily if the proceeds are to be paid by
wire. The proceeds must be payable to the shareholder(s) of record and sent to
the address of record for the account or wired directly to their predesignated
bank account. This privilege is not available if the address of record has been
changed within 30 days prior to a telephone redemption request. Proceeds from
redemptions are expected to be wired on the next business day following the date
of redemption. This service is also not available with respect to shares held in
an individual retirement account (IRA) for which Van Kampen Trust Company acts
as custodian. The Fund reserves the right at any time to terminate, limit or
otherwise modify this redemption privilege.
 
  GENERAL REDEMPTION INFORMATION. The Fund may redeem any shareholder account
with a net asset value on the date of the notice of redemption less than the
minimum initial investment as specified in this Prospectus. At least 60 days
advance written notice of any such involuntary redemption will be given and the
shareholder will be given an opportunity to purchase the required value of
additional shares at the next determined net asset value without sales charge.
Any involuntary redemption may only occur if the shareholder account is less
than the minimum initial investment due to shareholder redemptions.
 
  REDEMPTION UPON DEATH OR DISABILITY. The Fund will waive the CDSC on
redemptions following the death or disability of a Class B shareholder or Class
C shareholder. An individual will be considered disabled for this purpose if he
or she meets the definition thereof in Section 72(m)(7) of the Code, which in
pertinent part defines a person as disabled if such person "is unable to engage
in any substantial gainful activity by reason of any medically determinable
physical or mental impairment which can be expected to result in death or to be
of long-continued and indefinite duration." While the Fund does not specifically
adopt the balance of the Code's definition which pertains to furnishing the
Secretary of Treasury with such proof as he or she may require, the Distributor
will require satisfactory proof of disability before it determines to waive the
CDSC on Class B shares and Class C shares.
 
  In cases of death or disability, the CDSC on Class B shares and Class C shares
will be waived where the decedent or disabled person is either an individual
shareholder or owns the shares as a joint tenant with right of survivorship or
is the beneficial owner of a custodial or fiduciary account, and where the
redemption is made within one year of the death or initial determination of
disability. This waiver of the CDSC on Class B shares and Class C shares applies
to a total or partial redemption, but only to redemptions of shares held at the
time of the death or initial determination of disability.
 
  REINSTATEMENT PRIVILEGE. A Class A shareholder or Class B shareholder who has
redeemed shares of the Fund may reinstate any portion or all of the net proceeds
of such redemption in Class A shares of the Fund. A Class C shareholder who has
redeemed shares of the Fund may reinstate any portion or all of the net proceeds
of such redemption in Class C shares of the Fund with credit given for any CDSC
paid upon such redemption. Such reinstatement is made at the net asset value
(without sales charge except as described under "Shareholder
Services -- Exchange Privilege") next determined after the order is received,
which must be within 180 days after the date of the redemption. Reinstatement at
net asset value is also offered to participants in those eligible retirement
plans held or administered by Van Kampen Trust Company for repayment of
principal (and interest) on their borrowings on such plans.
 
                                       29
<PAGE>   30
 
- --------------------------------------------------------------------------------
DISTRIBUTION AND SERVICE PLANS
- --------------------------------------------------------------------------------
 
  The Fund has adopted a distribution plan (the "Distribution Plan") with
respect to each class of its shares pursuant to Rule 12b-1 under the 1940 Act.
The Fund also has adopted a service plan (the "Service Plan") with respect to
each class of its shares. The Distribution Plan and the Service Plan provide
that the Fund may spend a portion of the Fund's average daily net assets
attributable to each class of shares in connection with distribution of the
respective class of shares and in connection with the provision of ongoing
services to shareholders of each class. The Distribution Plan and the Service
Plan are being implemented through an agreement with the Distributor and
sub-agreements between the Distributor and brokers, dealers or financial
intermediaries (collectively, "Selling Agreements") that may provide for their
customers or clients certain services or assistance.
 
  CLASS A SHARES. The Fund may spend an aggregate amount up to 0.25% per year of
the average daily net assets attributable to the Class A shares of the Fund
pursuant to the Distribution Plan and Service Plan. From such amount, the Fund
may spend up to 0.25% per year of the Fund's average daily net assets
attributable to the Class A shares pursuant to the Service Plan in connection
with the ongoing provision of services to holders of such shares by the
Distributor and by brokers, dealers or financial intermediaries and in
connection with the maintenance of such shareholders' accounts. The Fund pays
the Distributor the lesser of the balance of the 0.25% not paid to such brokers,
dealers or financial intermediaries or the amount of the Distributor's actual
distribution-related expense.
 
  CLASS B SHARES. The Fund may spend up to 0.75% per year of the average daily
net assets attributable to the Class B shares of the Fund pursuant to the
Distribution Plan. In addition, the Fund may spend up to 0.25% per year of the
Fund's average daily net assets attributable to the Class B shares pursuant to
the Service Plan in connection with the ongoing provision of services to holders
of such shares by the Distributor and by brokers, dealers or financial
intermediaries and in connection with the maintenance of such shareholders'
accounts.
 
  CLASS C SHARES. The Fund may spend up to 0.75% per year of the average daily
net assets attributable to the Class C shares of the Fund pursuant to the
Distribution Plan. From such amount, the Fund, or the Distributor as agent for
the Fund, pays brokers, dealers or financial intermediaries in connection with
the distribution of the Class C shares up to 0.75% of the Fund's average daily
net assets attributable to Class C shares maintained in the Fund more than one
year by such broker's, dealer's or financial intermediary's customers. The Fund
pays the Distributor the lesser of the balance of 0.75% not paid to such
brokers, dealers or financial intermediaries or the amount of the Distributor's
actual distribution-related expense attributable to the Class C shares. In
addition, the Fund may spend up to 0.25% per year of the Fund's average daily
net assets attributable to the Class C shares pursuant to the Service Plan in
connection with the ongoing provision of services to holders of such shares by
the Distributor and by brokers, dealers or financial intermediaries and in
connection with the maintenance of such shareholders' accounts.
 
  OTHER INFORMATION. Amounts payable to the Distributor with respect to the
Class A shares under the Distribution Plan in a given year may not fully
reimburse the Distributor for its actual distribution-related expenses during
such year. In such event, with respect to the Class A shares, there is no
carryover of such reimbursement obligations to succeeding years.
 
  The Distributor's actual expenses with respect to Class B shares or Class C
shares for any given year may exceed the amounts payable to the Distributor with
respect to such class of shares under the Distribution Plan, the Service Plan
and payments received pursuant to the CDSC. In such event, with respect to any
such class of shares, any unreimbursed expenses will be carried forward and paid
by the Fund (up to the amount of the actual expenses incurred) in future years
so long as such Distribution Plan is in effect. Except as mandated by applicable
law, the Fund does not impose any limit with respect to the number of years into
the future that such unreimbursed expenses may be carried forward (on a Fund
level basis). Because such expenses are accounted on a Fund level basis, in
periods of extreme net asset value fluctuation such amounts with respect to a
particular Class B share or Class C share may be greater or less than the amount
of the initial commission (including carrying cost) paid by the Distributor with
respect to such share. In such circumstances, a shareholder of a share may be
deemed to incur expenses attributable to other shareholders of such class. As of
December 31, 1997, there were $666,494 and $29,521 of unreimbursed
distribution-related expenses with respect to Class B shares and Class C shares,
respectively, representing 6.63% and 1.71% of the Fund's net assets attributable
to Class B shares and Class C shares, respectively. If the Distribution Plan was
terminated or not continued, the Fund would not be contractually obligated to
pay the Distributor for any expenses not previously reimbursed by the Fund or
recovered through CDSCs.
 
                                       30
<PAGE>   31
 
  The Distributor will not use the proceeds from the CDSC applicable to a
particular class of shares to defray distribution-related expenses attributable
to any other class of shares. Various federal and state laws prohibit national
banks and some state-chartered commercial banks from underwriting or dealing in
the Fund's shares. In addition, state securities laws on this issue may differ
from the interpretations of federal law, and banks and financial institutions
may be required to register as dealers pursuant to state law. In the unlikely
event that a court were to find that these laws prevent such banks from
providing such services described above, the Fund would seek alternate providers
and expects that shareholders would not experience any disadvantage.
 
- --------------------------------------------------------------------------------
DISTRIBUTIONS FROM THE FUND
- --------------------------------------------------------------------------------
 
  In addition to any increase in the value of shares which the Fund may achieve,
shareholders may receive two kinds of return from the Fund: dividends and
capital gains distributions.
 
  DIVIDENDS. Dividends from net investment income (including stocks, interest
earned from other investments and net short-term capital gains, but not net
capital gains) are the Fund's main source of income. Substantially all of this
income, less expenses, is distributed annually as dividends to shareholders.
Dividends are automatically applied to purchase additional shares of the Fund at
the next determined net asset value. See "Shareholder Services -- Reinvestment
Plan."
 
  The per share dividends on Class B shares and Class C shares may be lower than
the per share dividends on Class A shares as a result of the higher distribution
fees and transfer agency costs applicable to such classes of shares.
 
  CAPITAL GAINS. The Fund may realize capital gains or losses when it sells
securities, depending on whether the sales prices for the securities are higher
or lower than their purchase prices. The Fund at least annually distributes to
shareholders its net capital gains, which are the excess of the Fund's net
long-term capital gains, if any on the sale of securities during the year over
its net short-term capital losses on the sale of securities, including capital
losses carried forward from prior years in accordance with tax laws ("capital
gain distributions"). As in the case of dividends, capital gains distributions
are automatically reinvested in additional shares of the Fund at net asset value
unless the shareholder elects otherwise. See "Shareholder
Services -- Reinvestment Plan."

- --------------------------------------------------------------------------------
TAX STATUS
- --------------------------------------------------------------------------------
 
  FEDERAL INCOME TAXATION OF THE FUND.  The Fund has elected and qualified and
intends to continue to qualify each year to be treated as a regulated investment
company under Subchapter M of the Code. To qualify as a regulated investment
company, the Fund must comply with certain requirements of the Code relating to,
among other things, the source of its income and diversification of its assets.
 
  If the Fund so qualifies and distributes each year to its shareholders at
least 90% of its net investment income (including tax-exempt interest, taxable
income and net short-term capital gain, but not net capital gains, which are the
excess of net long-term capital gains over net short-term capital losses), it
will not be required to pay federal income taxes on any income distributed to
shareholders. The Fund intends to distribute at least the minimum amount of net
investment income necessary to satisfy the 90% distribution requirement. The
Fund will not be subject to federal income tax on any net capital gains
distributed to shareholders.
 
  In order to avoid a 4% excise tax, the Fund will be required to distribute, by
December 31 of each year, at least 98% of its ordinary income (not including
tax-exempt income) for such year and at least 98% of its capital gain net income
(the latter of which generally is computed on the basis of the one-year period
ending on October 31 of such year), plus any amounts that were not distributed
in previous taxable years. For purposes of the excise tax, any ordinary income
or capital gain net income retained by, and subject to federal income tax in the
hands of, the Fund will be treated as having been distributed.
 
  If the Fund failed to qualify as a regulated investment company or failed to
satisfy the 90% distribution requirement in any taxable year, the Fund would be
taxed as an ordinary corporation on its taxable income (even if such income were
distributed to its shareholders) and all distributions out of earnings and
profits would be taxed to shareholders as ordinary income. To qualify again as a
regulated investment company in a subsequent year, the Fund may be required to
pay an interest charge on 50% of its earnings and profits attributable to
non-regulated investment company years and would be
 
                                       31
<PAGE>   32
 
required to distribute such earnings and profits to shareholders (less any
interest charge). In addition, if the Fund failed to qualify as a regulated
investment company for its first taxable year or, if immediately after
qualifying as a regulated investment company for any taxable year, it failed to
qualify for a period greater than one taxable year, the Fund would be required
to recognize any net built-in gains (the excess of aggregate gains, including
items of income, over aggregate losses that would have been realized if it had
been liquidated) in order to qualify as a regulated investment company in a
subsequent year.
 
  Some of the Fund's investment practices are subject to special provisions of
the Code that, among other things, may defer the use of certain losses of the
Fund and affect the holding period of the securities held by the Fund and the
character of the gains or losses realized by the Fund. These provisions may also
require the Fund to recognize income or gain without receiving cash with which
to make distributions in amounts necessary to satisfy the 90% distribution
requirement and the distribution requirements for avoiding income and excise
taxes. The Fund will monitor its transactions and may make certain tax elections
in order to mitigate the effect of these rules and prevent disqualification of
the Fund as a regulated investment company.
 
  Investments of the Fund in securities issued at a discount or providing for
deferred interest or payment of interest in kind are subject to special tax
rules that will affect the amount, timing and character of distributions to
shareholders. For example, with respect to securities issued at a discount, the
Fund will be required to accrue as income each year a portion of the discount
and to distribute such income each year in order to maintain its qualification
as a regulated investment company and to avoid income and excise taxes. In order
to generate sufficient cash to make distributions necessary to satisfy the 90%
distribution requirement and to avoid income and excise taxes, the Fund may have
to dispose of securities that it would otherwise have continued to hold.
 
  The Fund may invest in the stock of "passive foreign investment companies"
("PFICs"). A PFIC is a foreign corporation that, in general, meets either of the
following tests: (i) at least 75% of its gross income is passive income or (ii)
an average of at least 50% of its assets produce, or are held for the production
of, passive income. Under certain circumstances, a regulated investment company
that holds stock of a PFIC will be subject to federal income tax on (i) a
portion of any "excess distribution" received on such stock or (ii) any gain
from a sale or disposition of such stock (collectively, "PFIC income"), plus
interest on such amounts, even if the regulated investment company distributes
the PFIC income as a taxable dividend to its shareholders. The balance of the
PFIC income will be included in the regulated investment company's investment
company taxable income and, accordingly, will not be taxable to it to the extent
that income is distributed to its shareholders. If the Fund invests in a PFIC
and elects to treat the PFIC as a "qualified electing fund," then in lieu of the
foregoing tax and interest obligation, the Fund would be required to include in
income each year its pro rata share of the qualified electing fund's annual
ordinary earnings and net capital gain, which most likely would have to be
distributed to satisfy the 90% distribution requirement and the distribution
requirement for avoiding income and excise taxes. In most instances it will be
very difficult to make this election due to certain requirements imposed with
respect to the election.
 
  As an alternative to making the above-described election to treat the PFIC as
a qualified electing fund, the Fund may make an election to annually
mark-to-market certain publicly traded PFIC stock (a "PFIC Mark-to-Market
Election"). "Marking-to-market," in this context, means recognizing as ordinary
income or loss each year an amount equal to the difference between the Fund's
adjusted tax basis in such PFIC stock and its fair market value. Losses will be
allowed only to the extent of net mark-to-market gain previously included by the
Fund pursuant to the election for prior taxable years. The Fund may be required
to include in its taxable income for the first taxable year in which it makes a
PFIC Mark-to-Market Election an amount equal to the interest charge that would
otherwise accrue with respect to distributions on, or dispositions of, the PFIC
stock. This amount would not be deductible from the Fund's taxable income. The
PFIC Mark-to-Market Election applies to the taxable year for which made and to
all subsequent taxable years, unless the PFIC stock ceases to be publicly traded
or the Internal Revenue Service consents to revocation of the election. By
making the PFIC Mark-to-Market Election, the Fund could ameliorate the adverse
tax consequences arising from its ownership of PFIC stock, but in any particular
year may be required to recognize income in excess of the distributions it
receives from the PFIC and proceeds from the dispositions of PFIC stock.
 
  DISTRIBUTIONS.  Distributions of the Fund's net investment income are taxable
to shareholders as ordinary income to the extent of the Fund's earnings and
profits, whether paid in cash or reinvested in additional shares. Distributions
of the Fund's net capital gains ("capital gains dividends"), if any, are taxable
to shareholders as long-term capital gains
 
                                       32
<PAGE>   33
 
regardless of the length of time shares of the Fund have been held by such
shareholders. Distributions in excess of the Fund's earnings and profits will
first reduce the adjusted tax basis of a holder's shares and, after such
adjusted tax basis is reduced to zero, will constitute capital gains to such
holder (assuming such shares are held as a capital asset). For a summary of the
tax rates applicable to capital gains (including capital gain dividends), see
"Capital Gains Rates Under the 1997 Tax Act" below. Tax-exempt shareholders not
subject to federal income tax on their income generally will not be taxed on
distributions from the Fund.
 
  Shareholders receiving distributions in the form of additional shares issued
by the Fund will be treated for federal income tax purposes as receiving a
distribution in an amount equal to the fair market value of the shares received,
determined as of the distribution date. The basis of such shares will equal the
fair market value on the distribution date.
 
  The Fund will inform shareholders of the source and tax status of all
distributions promptly after the close of each calendar year. Some portion of
the distributions from the Fund may be eligible for the dividends received
deduction for corporations if the Fund receives qualifying dividends during the
year and if certain other requirements of the Code are satisfied. Fund
distributions will not qualify for the dividends received deduction for
corporations, except to the extent the Fund receives dividends from domestic
corporations.
 
  Although dividends generally will be treated as distributed when paid,
dividends declared in October, November or December, payable to shareholders of
record on a specified date in such month and paid during January of the
following year will be treated as having been distributed by the Fund and
received by the shareholders on the December 31 prior to the date of payment. In
addition, certain other distributions made after the close of a taxable year of
the Fund may be "spilled back" and treated as paid by the Fund (except for
purposes of the 4% excise tax) during such taxable year. In such case,
shareholders will be treated as having received such dividends in the taxable
year in which the distribution was actually made.
 
  Income from investments in foreign securities received by the Fund may be
subject to income, withholding and other taxes imposed by foreign countries and
U.S. possessions. Tax conventions between certain countries and the United
States may reduce or eliminate such taxes. Investors may be entitled to claim
United States foreign tax credits with respect to such taxes, subject to certain
provisions and limitations contained in the Code. If more than 50% in value of
the Fund's total assets at the close of its fiscal year consists of securities
of foreign issuers, the Fund will be eligible to, and may, file elections with
the Internal Revenue Service pursuant to which shareholders of the Fund will be
required to (i) include their respective pro rata portions of such taxes in
their United States income tax returns as gross income, and (ii) treat such
respective pro rata portions as taxes paid by them. Shareholders will be
entitled, subject to certain limitations, to either deduct their respective pro
rata portions of such foreign taxes in computing their taxable incomes or use
them as foreign tax credits against their United States federal income taxes. No
deduction for such foreign taxes may be claimed by a shareholder who does not
itemize deductions. Each shareholder will be notified annually whether the
foreign taxes paid by the Fund will "pass through" for that year and, if so,
such notification will designate (i) the shareholder's portion of the foreign
taxes paid to each country and (ii) the portion of dividends that represent
income derived from sources within each country. The amount of foreign taxes for
which a shareholder may claim a credit in any year will be subject to an overall
limitation such that the credit may not exceed the shareholder's U.S. federal
income tax attributable to the shareholder's foreign source taxable income. This
limitation generally applies separately to certain specific categories of
foreign source income including "passive income" which includes, among other
types of income, dividends and interest. The foregoing is only a general
description of the foreign tax credit under current law. Because application of
the rules described above depends on the particular circumstances of each
shareholder, shareholders are advised to consult their own tax advisers.
 
  Under Code Section 988, foreign currency gains or losses from certain forward
contracts not traded in the interbank market as well as certain other gains or
losses attributable to currency exchange rate fluctuations are typically treated
as ordinary income or loss. Such income or loss may increase or decrease (or
possibly eliminate) the Fund's income available for distribution. If, under the
rules governing the tax treatment of foreign currency gains and losses, the
Fund's income available for distribution is decreased or eliminated, all or a
portion of the dividends declared by the Fund may be treated for federal income
tax purposes as a return of capital or, in some circumstances, as capital gain.
Generally, a shareholder's tax basis in Fund shares will be reduced to the
extent that an amount distributed to such shareholder is treated as a return of
capital.
 
                                       33
<PAGE>   34
 
  The Fund is required, in certain circumstances, to withhold 31% of dividends
and certain other payments, including redemptions, paid to shareholders who do
not furnish to the Fund their correct taxpayer identification number (in the
case of individuals, their social security number) and certain required
certifications or who are otherwise subject to backup withholding.
 
  SALE OF SHARES.  The sale of shares (including transfers in connection with a
redemption or repurchase of shares) will be a taxable transaction for federal
income tax purposes. Selling shareholders will generally recognize gain or loss
in an amount equal to the difference between their adjusted tax basis in the
shares and the amount received. If such shares are held as a capital asset, the
gain or loss will be a capital gain or loss and will be long-term if such shares
have been held for more than one year. For a summary of the tax rates applicable
to capital gains, see "Capital Gains Rates Under the 1997 Tax Act" below. Any
loss recognized upon a taxable disposition of shares held for six months or less
will be treated as a long-term capital loss to the extent of any capital gain
dividends received with respect to such shares. For purposes of determining
whether shares have been held for six months or less, the holding period is
suspended for any periods during which the shareholder's risk of loss is
diminished as a result of holding one or more other positions in substantially
similar or related property or through certain options or short sales.
 
  CAPITAL GAINS RATES UNDER THE 1997 TAX ACT.  Under the Taxpayer Relief Act of
1997 (the "1997 Tax Act"), the maximum tax rate applicable to net capital gains
recognized by individuals and other non-corporate taxpayers is (i) the same as
the maximum ordinary income tax rate for capital assets held for one year or
less, (ii) 28% for capital assets held for more than one year but not more than
18 months and (iii) 20% for capital assets held for more than 18 months. The
maximum net capital gains tax rate for corporations remains at 35%. The tax
rates for capital gains described above will apply to distributions of capital
gain dividends by the Fund (if, as expected, the Fund designates capital gain
dividends as 28% rate gain distributions or 20% rate gain distributions, in
accordance with its holding periods for the securities sold that generated such
capital gain dividends) as well as to sales and exchanges of shares in the Fund.
With respect to capital losses recognized on dispositions of shares held six
months or less where such losses are treated as long-term capital losses to the
extent of prior capital gain distributions received on such shares (see "Sale of
Shares" above), it is unclear how such capital losses offset the capital gains
referred to above. Shareholders should consult their own tax advisers as to the
application of the new capital gains rates to their particular circumstances.
 
  GENERAL.  The federal, state and local income tax discussion set forth above
is for general information only. Prospective investors should consult their
advisors regarding the specific federal tax consequences of purchasing, holding
and disposing of shares, as well as the effects of state, local and foreign tax
law and any proposed tax law changes.
 
- --------------------------------------------------------------------------------
FUND PERFORMANCE
- --------------------------------------------------------------------------------
 
  From time to time, the Fund may advertise its total return for prior periods.
Any such advertisement would include at least average annual total return
quotations for a one year period or for the life of the Fund. Other total return
quotations, aggregate or average, over other time periods may also be included.
 
  The total return of the Fund for a particular period represents the increase
(or decrease) in the value of a hypothetical investment in the Fund from the
beginning to the end of the period. Total return is calculated by subtracting
the value of the initial investment from the ending value and showing the
difference as a percentage of the initial investment; the calculation assumes
the initial investment is made at the current maximum public offering price
(which includes a maximum sales charge of 4.75% for Class A shares); that all
income dividends or capital gains distributions during the period are reinvested
in Fund shares at net asset value; and that any applicable CDSC has been paid.
The Fund's total return will vary depending on market conditions, the securities
comprising the Fund's portfolio, the Fund's operating expenses and unrealized
net capital gains or losses during the period. Total return is based on
historical earnings and asset value fluctuations and is not intended to indicate
future performance. No adjustments are made to reflect any income taxes payable
by shareholders on dividends and distributions paid by the Fund.
 
  Average annual total return quotations for periods of two or more years are
computed by finding the average annual compounded rate of return over the period
that would equate the initial amount invested to the ending redeemable value.
 
  Total return is calculated separately for Class A shares, Class B shares and
Class C shares. Class A shares total return figures include the maximum sales
charge of 4.75%; Class B shares and Class C shares total return figures include
any
 
                                       34
<PAGE>   35
 
applicable CDSC. Because of the differences in sales charges and distribution
fees, the total returns for each of the classes will differ.
 
  From time to time, the Fund may include in its sales literature and
shareholder reports a quotation of the current "distribution rate" for each
class of shares of the Fund. Distribution rate is a measure of the level of
income and short-term capital gain dividends, if any, distributed for a
specified period. Distribution rate differs from yield which is a measure of the
income actually earned by the Fund's investments, and from total return which is
a measure of the income actually earned by the Fund's investments plus the
effect of any realized and unrealized appreciation or depreciation of such
investments during a stated period. Distribution rate is, therefore, not
intended to be a complete measure of the Fund's performance. Distribution rate
may sometimes be greater than yield since, for instance, it may not include the
effect of amortization of bond premiums, and may include non-recurring
short-term capital gains and premiums from futures transactions engaged in by
the Fund. Distribution rates will be computed separately for each class of the
Fund's shares.
 
  In reports or other communications to shareholders or in advertising material,
the Fund may compare its performance with that of other mutual funds as listed
in the ratings or rankings prepared by Lipper Analytical Services, Inc., CDA,
Morningstar Mutual Funds or similar independent services which monitor the
performance of mutual funds, with the Consumer Price Index, the Dow Jones
Industrial Average Index, Standard & Poor's, or NASDAQ Composite Index, other
appropriate indices of investment securities, or with investment or savings
vehicles. The performance information may also include evaluations of the Fund
published by nationally recognized ranking services and by nationally recognized
financial publications. Such comparative performance information will be stated
in the same terms in which the comparative data or indices are stated. Such
advertisements and sales material may also include a yield quotation as of a
current period. In each case, such total return and yield information, if any,
will be calculated pursuant to rules established by the SEC and will be computed
separately for each class of the Fund's shares. For these purposes, the
performance of the Fund, as well as the performance of other mutual funds or
indices, do not reflect sales charges, the inclusion of which would reduce Fund
performance. The Fund will include performance data for each class of shares of
the Fund in any advertisement or information including performance data of the
Fund.
 
  The Fund may also utilize performance information in hypothetical
illustrations provided in narrative form. These hypotheticals will be
accompanied by the standard performance information required by the SEC as
described above.
 
  The Fund's Annual Report and Semi-Annual Report contains additional
performance information. A copy of the Annual Report and Semi-Annual Report may
be obtained without charge by calling or writing the Fund at the telephone
number and address printed on the cover of this Prospectus.
 
- --------------------------------------------------------------------------------
DESCRIPTION OF SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
  The Fund was originally incorporated in Maryland on November 24, 1993. The
Fund was reorganized as a business trust under the laws of the State of Delaware
as of August 5, 1995 and on July 14, 1998 adopted its current name. The
authorized capitalization of the Fund consists of an unlimited number of shares
of beneficial interest, par value $0.01 per share, divided into classes. The
Fund currently offers three classes of shares, designated Class A shares, Class
B shares and Class C shares. Other classes may be established from time to time
in accordance with provisions of the Fund's Declaration of Trust. Shares issued
by the Fund are fully paid, non-assessable and, except as described herein, have
no preemptive or conversion rights.
 
  Each class of shares represents an interest in the same assets of the Fund and
generally are identical in all respects except that each class bears certain
distribution expenses and has exclusive voting rights with respect to its
distribution fee. There are no conversion, preemptive or other subscription
rights, except with respect to the conversion of certain shares into Class A
shares as described herein. In the event of liquidation, each of the shares of
the Fund is entitled to its portion of all of the Fund's net assets after all
debt and expenses of the Fund have been paid. Since Class B shares and Class C
shares pay higher distribution fees and transfer agency costs, the liquidation
proceeds to Class B shareholders and Class C shareholders are likely to be lower
than to other shareholders.
 
  The Fund does not contemplate holding regular meetings of shareholders to
elect Trustees or otherwise. However, the holders of 10% or more of the
outstanding shares may by written request require a meeting to consider the
removal of Trustees by a vote of two-thirds of the shares then outstanding cast
in person or by proxy at such meeting. The Fund will
 
                                       35
<PAGE>   36
 
assist such holders in communicating with other shareholders of the Fund to the
extent required by the 1940 Act. More detailed information concerning the Fund
is set forth in the Statement of Additional Information.
 
  The Fund's Declaration of Trust provides that no Trustee, officer or
shareholder of the Fund shall be held to any personal liability, nor shall
resort be had to their private property for the satisfaction of any obligation
or liability of the Fund but the assets of the Fund only shall be liable.
 
- --------------------------------------------------------------------------------
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
  This Prospectus and the Statement of Additional Information do not contain all
the information set forth in the Registration Statement filed by the Fund with
the SEC under the 1933 Act. Copies of the Registration Statement may be obtained
at a reasonable charge from the SEC or may be examined, without charge, at the
office of the SEC in Washington, D.C.
 
  The fiscal year end of the Fund is December 31. The Fund sends to its
shareholders at least semi-annually reports showing the Fund's portfolio and
other information. An annual report, containing financial statements audited by
the Fund's independent accountants, is sent to shareholders each year. After the
end of each year, shareholders will receive federal income tax information
regarding dividends and capital gains distributions.
 
  Shareholder inquiries should be directed to the Van Kampen Global Managed
Assets Fund, One Parkview Plaza, Oakbrook Terrace, Illinois 60181, Attn:
Correspondence.
 
  For Automated Telephone Service which provides 24-hour direct dial access to
Fund facts and shareholder account information, dial (800) 847-2424. For
inquiries through Telecommunications Device for the Deaf (TDD) dial (800)
421-2833.
 
                                       36
<PAGE>   37
 
EXISTING SHAREHOLDERS--
FOR INFORMATION ON YOUR
EXISTING ACCOUNT PLEASE CALL
THE FUND'S TOLL-FREE
NUMBER--(800) 341-2911
 
PROSPECTIVE INVESTORS--CALL
YOUR BROKER OR (800) 421-5666
 
DEALERS--FOR DEALER
INFORMATION, SELLING
AGREEMENTS, WIRE ORDERS, OR
REDEMPTIONS CALL THE
DISTRIBUTOR'S TOLL-FREE
NUMBER--(800) 421-5666
 
FOR SHAREHOLDER AND DEALER
INQUIRIES THROUGH
TELECOMMUNICATIONS
DEVICE FOR THE DEAF (TDD)
DIAL (800) 421-2833
 
FOR AUTOMATED TELEPHONE
SERVICES DIAL (800) 847-2424
 
VAN KAMPEN GLOBAL MANAGED
ASSETS FUND
One Parkview Plaza
Oakbrook Terrace, IL 60181
 
Investment Adviser
 
VAN KAMPEN ASSET MANAGEMENT INC.
One Parkview Plaza
Oakbrook Terrace, IL 60181







Investment Subadviser
 
MORGAN STANLEY ASSET
MANAGEMENT INC.
1221 Avenue of the Americas
New York, NY 10020
 
Distributor
 
VAN KAMPEN FUNDS INC.
One Parkview Plaza
Oakbrook Terrace, IL 60181
 
Transfer Agent
 
VAN KAMPEN INVESTOR SERVICES INC.
P.O. Box 418256
Kansas City, MO 64141-9256
Attn: Van Kampen Global Managed
    Assets Fund
 
Custodian
 
STATE STREET BANK AND
TRUST COMPANY
225 West Franklin Street
P.O. Box 1713
Boston, MA 02105-1713
Attn: Van Kampen Global Managed
    Assets Fund
 
Legal Counsel
 
SKADDEN, ARPS, SLATE,
MEAGHER & FLOM (ILLINOIS)
333 West Wacker Drive
Chicago, IL 60606
 
Independent Accountants
 
PRICEWATERHOUSECOOPERS LLP
200 East Randolph Drive
Chicago, IL 60601
<PAGE>   38
 
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                                 GLOBAL MANAGED
                                  ASSETS FUND
 
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       P       R       O      S      P      E      C      T      U      S
 
                       APRIL 30, 1998, AS SUPPLEMENTED ON
                      JULY 14, 1998 AND SEPTEMBER 28, 1998
 












                               [VAN KAMPEN LOGO]
                                                                    GMA PRO 9/98


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