Forrester Research (FORR) 10-Q/A 2005 Q3 Quarterly report (amended)

EXHIBIT 32.1

CERTIFICATION PURSUANT TO
SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 1350, Chapter 63 of Title 18, United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned, as Chief Executive Officer of Forrester Research, Inc. (the “Company”), does hereby certify that to the undersigned’s knowledge:

1)	the Company’s Quarterly Report on Form 10-Q/A for the three months ended September 30, 2005 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
2)	the information contained in the Company’s Quarterly Report on Form 10-Q/A for the three months ended September 30, 2005 fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ George F. Colony
	George F. Colony Chairman of the Board of Directors and Chief Executive Officer
Dated: February 24, 2006