Ottawa, Ontario and Burlington, Massachusetts, December 8, 2003—Cognos (Nasdaq: COGN; TSX: CSN), the world leader in business intelligence (BI) and corporate performance management, today announced that it will release third quarter fiscal 2004 financial results on December 17, 2003 after the close of the market. The company will discuss the results on a conference call and Webcast, beginning at 5:15 p.m. Eastern Time.

Listeners can access the conference call at 416-640-1907 or via Webcast at http://www.cognos.com/earnings. Presentation slides for the call can be accessed at the Investor Relations area of the Cognos Web site approximately 15 minutes prior to the start of the call.

The Webcast, including audio and accompanying slides, will be archived and available on the Cognos Web site at http://www.cognos.com/investor for one year. The conference call replay can be accessed at 416-640-1917 from Wednesday, December 17, 2003 at 8:15 p.m. Eastern Time until Wednesday, December 31, 2004 at 11:59 p.m. Eastern Time. The passcode for the replay is 21027086#.