Mail Stop 6010 September 22, 2005 Mr. Ron Foster Chief Financial Officer FormFactor, Inc. 7005 Southfront Road Livermore CA 94551 RE: FormFactor, Inc. Form 10-K for the fiscal year ended December 25, 2004 Filed March 14, 2005 File No. 0-50307 Dear Mr. Foster: We have completed our review of your Form 10-K and related filings and do not, at this time, have any further comments. Sincerely, Martin F. James Senior Assistant Chief Accountant ?? ?? ?? ?? Mr. John T. Dickson Agere Systems, Inc. September 9, 2004 Page 1 of 3