Keynote to Celebrate World Usability Day 2006 (November 14) by Hosting Official Event at San Mateo, CA Headquarters

• World Usability Day Event Planned for November 14, 2006, 3-7pm PST
• Usability and Design Expert, Aaron Marcus, to Present ''Cross-Cultural User Interface Design''
• Keynote Set to Launch WebEffective™ 5.0, the Leading On-Demand Customer Experience Research Application, Very Same Day
• User Experience Professionals and Media Welcome to Attend

SAN MATEO, Calif.--(BUSINESS WIRE)--Keynote (Nasdaq:KEYN), The Mobile and Internet Performance Authority™, today announced it will participate in World Usability Day 2006 by sponsoring an official event at its headquarters in San Mateo, California. The celebratory event, “Improving the Online User Experience,” will be held on Tuesday, November 14, 2006, 3-7pm PST. Keynote headquarters is located at 777 Mariners Island Blvd., San Mateo, CA 94404. On the same day, Keynote is scheduled to announce WebEffective 5.0, a significantly upgraded version of its on-demand software application designed to help companies improve their Web site effectiveness and online business performance by conducting in-depth, online customer experience research studies.

User experience professionals and interested media in the San Francisco Bay area are welcome to attend the event, which will feature food and drink, informative presentations, and an opportunity to network with industry peers. Renowned usability and design expert, Aaron Marcus, will present “Cross-Cultural User Interface Design” from the Keynote event at 6:15pm PST. Mr. Marcus’ presentation will also be available globally by Webcast at that time. For information on viewing the webcast see www.worldusability.org. Keynote’s Customer Experience/UX team will be available during the event to discuss best practices in online customer experience research, and to demonstrate the capabilities of Keynote WebEffective, an on-demand software application designed to help companies improve online business performance by conducting in-depth, online customer experience research studies.

Sponsored annually by the Usability Professionals’ Association (UPA), World Usability Day promotes the value of usability engineering, user-centered design, and every user's right to ask for things that work better. The UPA is organizing and sponsoring 36 hours of World Usability Day activities at the local level around the globe, all occurring on November 14, 2006.

About Keynote

Keynote Systems (Nasdaq “KEYN”) is the global leader in test & measurement solutions that improve mobile communications and online business performance. As an independent and trusted third-party, Keynote provides IT and marketing executives with an unbiased view into their Internet services from around the world. For over a decade, we have been providing measurement data and testing capabilities that allow companies to understand and improve their customer’s online and mobile experience. Keynote has four test and measurement businesses: Web performance, mobile quality, streaming & VoIP, and customer experience/UX. In addition, our industry analysis group called Keynote Competitive Research publishes proprietary studies measuring customer experience and service levels across a wide range of industries.

Known as The Mobile and Internet Performance Authority™, Keynote has a market-leading infrastructure of 2,400 measurement computers and mobile devices in over 240 locations around the world. Keynote also maintains one of the most representative panels of online users consisting of 160,000 consumers. Our on-demand, hassle-free infrastructure allows businesses to access services they need, when they need them to pinpoint and fix mobile quality and Internet problems before they impact customers.

We help over 2,600 corporate customers become “the best of the best” by helping them improve online business performance and mobile communications quality. Our customers represent top Internet and mobile companies including American Express, BP, Caterpillar, Dell, Disney, eBay, ESPN Mobile, E*TRADE, Expedia, FedEx, Microsoft, SonyEricsson, Sprint, T-Mobile, Verizon and Vodafone.

Keynote Systems, Inc. is headquartered in San Mateo, California and can be reached at www.keynote.com or by telephone in the U.S. at [phone].

Keynote, The Internet Performance Authority and Perspective are registered trademarks and The Mobile and Internet Performance Authority and True Experience are trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners. © 2006 Keynote Systems, Inc.