EXHIBIT NO. EX-99.H.3.I

                        DIMENSIONAL INVESTMENT GROUP INC.

                      THE DFA 6-10 INSTITUTIONAL PORTFOLIO

                        FORM OF ADMINISTRATION AGREEMENT
                               ADDENDUM NUMBER ONE

         THIS ADDENDUM made this ___ day of ________, 2001, by and between
DIMENSIONAL INVESTMENT GROUP INC., a Maryland corporation (the "Fund"), on
behalf of:

                     "THE DFA 6-10 INSTITUTIONAL PORTFOLIO"

(the "Portfolio"), a separate series of the Fund, and DIMENSIONAL FUND
ADVISORS INC., a Delaware corporation (the "Administrator").

         WHEREAS, the Fund and the Administrator have previously entered into an
Administration Agreement, dated May 3, 1993 (the "Administration Agreement"),
pursuant to which the Administrator has agreed to provide the services,
assistance and facilities of an administrator, and to perform various
administrative and other services for the Portfolio; and

         WHEREAS, the administrator has been informed by the Fund that the
Portfolio desires to change its name;

         NOW, THEREFORE, in consideration of the terms and conditions
hereinafter set forth, it is hereby agreed as follows:

         1. The name of the Portfolio shall be changed from "The DFA 6-10
Institutional Portfolio" to "The DFA Small Cap Institutional Portfolio," and all
references in the Administration Agreement to "The DFA 6-10 Institutional
Portfolio" shall be changed to "The DFA Small Cap Institutional Portfolio."

         2. The effective date of this Addendum shall be April 1, 2001.

         3. The parties hereby further agree that no other provisions of the
Administration Agreement are in any way modified by this Addendum, and that all
other provisions of the Administration Agreement remain in full force and
effect.

         IN WITNESS WHEREOF, the parties hereby have caused this Addendum to be
executed this ____ day of _______, 2001.

DIMENSIONAL INVESTMENT                           DIMENSIONAL FUND ADVISORS
GROUP INC.                                       INC.


By:                                              By:
   ---------------------------------------          ----------------------------
   Michael T. Scardina                              Catherine L. Newell
   Vice President, Chief Financial Officer          Vice President and Secretary
   and Treasurer