Cognos to Announce Third Quarter Fiscal 2006 Results on December 21

Ottawa, Ontario and Burlington, Massachusetts, December 8, 2005- Cognos (Nasdaq: COGN; TSX: CSN), the world leader in business intelligence and corporate performance management (CPM), today announced that it will release third quarter fiscal 2006 financial results on December 21, 2005 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 800-814-4861 or via Webcast at http://www.cognos.com/company/investor/events/fy06q3/index.html. 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.

An archive of the Webcast will be available commencing December 21, 2005 at 9:00 p.m. Eastern Time. The archive can be accessed at http://www.cognos.com/company/investor/events/fy06q3/index.html.

A replay of the conference call will be available from Wednesday, December 21, 2005 at 7:15 p.m. Eastern Time until January 4, 2006 at 11:59 p.m. Eastern Time. The replay can be accessed at 416-640-1917. The passcode for the replay is 21167560#.

About Cognos:
Cognos, the world leader in business intelligence and corporate performance management, delivers software and services that help companies drive, monitor and understand corporate performance.

Cognos serves more than 23,000 customers in over 135 countries. Cognos enterprise business intelligence and performance management solutions and services are also available from more than 3,000 worldwide partners and resellers. For more information, visit the Cognos Web site at http://www.cognos.com.