Company Announces Independent Investigation Into Stock Option
                           Dating Practices

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Dec. 19, 2006--Forrester Research, Inc. (Nasdaq: FORR) today announced that its Chief Financial Officer and Treasurer Warren Hadley has resigned effective immediately. His resignation was the result of initial findings of an internal investigation that uncovered irregularities with respect to an option grant for 5,000 shares made to Hadley in 1999. The initial findings resulted from a voluntary inquiry initiated by the Audit Committee of Forrester's board of directors. The Audit Committee has hired independent counsel to conduct the investigation and Forrester has informed the Securities and Exchange Commission.

While the impact of the particular option grant is not financially material, the review is still in the early stages. Forrester is unable to speculate whether, when the investigation is complete, there will be any material impact on current or prior financial statements. Any adjustments that would be required are expected to be non-cash, stock compensation charges and related tax benefit or expense. George F. Colony, chairman of the board and chief executive officer, will also serve as acting CFO while the Company conducts a search for the position.

The Audit Committee proactively and independently undertook the investigation to review stock option dating procedures consistent with best practices in corporate governance and Forrester's high level of integrity with which it conducts business. Based on its preliminary findings, the Audit Committee hired the law firm of Ropes & Gray LLP in November to conduct an independent investigation of its option grant practices.

Forrester's commitment to providing high-quality research services to its clients continues without disruption. As the investigation is ongoing, Forrester executives are not able to make any further comment at this time. The Company will provide updates as appropriate as the investigation continues or concludes.

About Forrester Research

Forrester Research (Nasdaq: FORR) is an independent technology and market research company that provides pragmatic and forward-thinking advice about technology's impact on business and consumers. For 23 years, Forrester has been a thought leader and trusted advisor, helping global clients lead in their markets through its research, consulting, events, and peer-to-peer executive programs. For more information, visit www.forrester.com.

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that involve a number of risks and uncertainties, including, without limitation, statements concerning the company's results of operations and financial position, the completion of the stock option dating practices investigation, the assessment of materiality for any period, the possibility of non-cash charges for compensation expense relating to past stock option grants and the resulting tax and accounting impact on any prior periods. There are a number of factors that could cause actual events to differ materially from those indicated. Such factors include, without limitation, Forrester's ability to anticipate business and economic conditions, technology spending, market trends, competition, industry consolidation, the ability to attract and retain professional staff, possible variations in Forrester's quarterly operating results, risks associated with Forrester's ability to offer new products and services, and Forrester's dependence on renewals of its membership-based research services and on key personnel, as well as other factors set forth in the company's most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q, as filed with the Securities and Exchange Commission.

(C) 2006, Forrester Research, Inc. All rights reserved. Forrester and WholeView are trademarks of Forrester Research, Inc.

    CONTACT: Forrester Research, Inc.
             Karyl Levinson, + 1-617-613-6262
             Vice President, Corporate Communications
             press@forrester.com
             or
             Phyllis Paparazzo, +1-617-613-6234
             Director, Investor Relations
             ppaparazzo@forrester.com

    SOURCE: Forrester Research, Inc. Contact: