ATG Customer Experience Platform to Power U.S. Army Online Marketplace; Integration with AKO Portal Offers Easy Access to Online Procurement System.

Business Editors/High-Tech Writers

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Jan. 30, 2004

ATG (Art Technology Group, Inc., Nasdaq: ARTG), the software provider behind the Web's richest customer experiences, today announced that it has provided the technology and solutions used by the U.S. Army Small Computer Program's (ASCP) it e-mart system. The new it e-mart system is designed to provide government users with an online marketplace to expedite purchasing IT products and services from all of the ASCP's pre-negotiated government discounted contracts.

Built using commercial-off-the-shelf (COTS) ATG software - the ATG e-Business Application Suite and the ATG Adaptive Scenario Engine - the ASCP Web site has been completely overhauled to create it e-mart, allowing users to quickly and easily navigate the site's product offerings. Similar ATG technology is being used to power sites such as U.S. Navy's E-Marketplace and the online commerce sites for Neiman Marcus, J.Crew, Restoration Hardware and many others.

One of the most significant features of the marketplace is the integration of it e-mart with the Army Knowledge Online (AKO) portal solution, which is also powered in part by ATG technology. This seamless integration with the AKO portal enables users to toggle back and forth between it e-mart and the AKO community. For the first time, users will also be able to move beyond the confines of the online catalogue and order custom-configured products.

"ATG's products and technology are helping organizations worldwide to reduce cost and build stronger relationships with their online users," said Geraldine Nagle, director, government sales, ATG. "We have a strong history of working closely with large government agencies and we're proud to continue our longstanding relationship with the U.S. Army."

About ATG

ATG (Art Technology Group, Inc., Nasdaq: ARTG) delivers innovative software to help high-end consumer-facing companies create a richer, more adaptive interactive experience for their customers and partners online and via other channels. ATG has delivered category-leading e-business solutions to many of the world's best-known brands including A&E Television, Aetna Services, Inc., Alcatel, American Airlines, Barclays Global Investors, Best Buy, BMG Direct, Eastman Kodak, Ford Motor Credit, HSBC, Hyatt, J. Crew, Merrill Lynch, Newell Rubbermaid, Target, U.S. Army, Walgreen Company and Wells Fargo. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America, Europe, and Asia. For more information about ATG, please visit www.atg.com.

(C)2004 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc. and ATG Relationship Management is its copyright. All other product names, service marks, and trademarks mentioned herein are trademarks of their respective owners.

This press release contains forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause ATG's actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Important risk factors affecting ATG's business generally may be found in their periodic reports and registration statements filed with the Securities and Exchange Commission at www.sec.gov. Risk factors related to the subject matter of this press release include, but are not limited to, the following possibilities that: customer's end users may not experience quicker or easier navigation of the ASCP site following product deployment; that integration of the ASCP site and AKO portal may not result in increased product orders; that deployment of the ASCP site and AKO portal may not result in reduced costs or stronger relations with end users; that deployment of the ASCP site and AKO portal may produce results not comparable to ATG customers described herein or otherwise deploying similar ATG products; that changes in regulations governing Department of Army contracting may affect the results or support of the ASCP site and AKO portal; that changes in Department of Army funding may affect the results or support of the ASCP site and AKO portal. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.