EXHIBIT 1(a)(4)

                                 AMENDMENT NO. 3
                                       TO
             AMENDED AND RESTATED AGREEMENT AND DECLARATION OF TRUST
                                       OF
                              AIM INVESTMENT FUNDS

         This Amendment No. 3 to the Amended and Restated Agreement and
Declaration of Trust of AIM Investment Funds (this "Amendment") amends,
effective as of September 23, 2002, the Amended and Restated Agreement and
Declaration of Trust of AIM Investment Funds (the "Trust") dated as of May 15,
2002 (the "Agreement").

         Under Section 9.7 of the Agreement, this Amendment may be executed by a
duly authorized officer of the Trust.

         NOW, THEREFORE, the Agreement is hereby amended as follows:

    1. Schedule A of the Agreement is hereby deleted in its entirety and
replaced with the following:

                                   "SCHEDULE A

                              AIM INVESTMENT FUNDS
                         PORTFOLIOS AND CLASSES THEREOF

<Table>
<Caption>
PORTFOLIO                                       CLASSES OF EACH PORTFOLIO
- ---------                                       -------------------------
                                             
AIM Developing Markets Fund                     Class A Shares
                                                Class B Shares
                                                Class C Shares

AIM Global Biotech Fund                         Class A Shares
                                                Class B Shares
                                                Class C Shares

AIM Global Energy Fund                          Class A Shares
                                                Class B Shares
                                                Class C Shares

AIM Global Financial Services Fund              Class A Shares
                                                Class B Shares
                                                Class C Shares
</Table>


<Table>
<Caption>
PORTFOLIO                                       CLASSES OF EACH PORTFOLIO
- ---------                                       -------------------------
                                             
AIM Global Health Care Fund                     Class A Shares
                                                Class B Shares
                                                Class C Shares

AIM Global Science and                          Class A Shares
Technology Fund                                 Class B Shares
                                                Class C Shares

AIM Libra Fund                                  Class A Shares
                                                Class B Shares
                                                Class C Shares

AIM Strategic Income Fund                       Class A Shares
                                                Class B Shares
                                                Class C Shares"
</Table>

     2. All references in the Agreement to "this Agreement" shall mean the
Agreement as amended by this Amendment.

     3. Except as specifically amended by this Amendment, the Agreement is
hereby confirmed and remains in full force and effect.

     IN WITNESS WHEREOF, the undersigned, a duly authorized officer of the
Trust, has executed this Amendment as of September 23, 2002.


                                            By: /s/ CAROL F. RELIHAN
                                               ---------------------------------
                                                    Name:  Carol F. Relihan
                                                    Title: Senior Vice President