[SRSY LOGO] Stradley Ronon Stevens & Young, LLP 2600 One Commerce Square Philadelphia, PA 19103-7098 Telephone (215) 564-8000 Fax (215) 564-8120 www.stradley.com Jana L. Cresswell 215-564-8048 September 28, 2007 VIA EDGAR Ms. Laura Hatch U.S. Securities and Exchange Commission Division of Investment Management 100 F Street, N.E. Washington, D.C. 20549 Re: DFA Investment Dimensions Group Inc. File Nos. 002-73948 and 811-3258 Dear Ms. Hatch: I am writing on behalf of the above-referenced Registrant, pursuant to Rule 477(a) under the Securities Act of 1933, as amended, to request the consent of the U.S. Securities and Exchange Commission (the "Commission") to the withdrawal of the post-effective amendment to the Registrant's registration statement on Form N-1A filed with EDGAR submission type 485BPOS, which was accepted via the EDGAR system at 4:17 p.m. on September 28, 2007 (Accession No. 0001193125-07-209999). Such post-effective amendment was filed with the incorrect EDGAR submission type of 485BPOS. The post-effective amendment has been re-filed using the correct EDGAR submission type of 485BXT. Therefore, Registrant respectfully requests the Commission's consent to the withdrawal of Registrant's post-effective amendment (Accession No. 0001193125-07-209999) filed under the EDGAR submission type 485BPOS. If you have any questions, or require anything further regarding the request, please contact me at (215) 564-8048. Very truly yours, /s/Jana L. Cresswell Jana L. Cresswell
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AW Filing
Dfa Investment Dimensions AWWithdrawal of amendment
Filed: 28 Sep 07, 12:00am