ATG Customers Realizing Continued Benefits Through Use of ATG 6; Companies Expanding Use of Scenario Personalization, Tapping Into New Modules Such as ATG Publishing.

Business Editors/High-Tech Writers

CAMBRIDGE, Mass.--(BUSINESS WIRE)--July 28, 2003

On the strength of its proven commerce and personalization capabilities and new additions such as the Publishing module, ATG (Art Technology Group, Nasdaq: ARTG), a leading provider of innovative software applications for commerce and customer self-service, is witnessing a great number of success stories among customers that have purchased the company's ATG 6 product.

Consumer-facing organizations from a number of different industries are reporting further success leveraging ATG 6, which shipped in December and features new capabilities such as publishing, as well as enhanced search and ATG's patented Scenario Personalization(SM) functionality. Campaigns designed to promote self-service and foster a more intimate and valuable online experience have become more robust and are yielding results even more quickly.

"ATG 6 has taken what ATG's technology has always done best, personalization and self-service, and rounded out its capabilities to produce a complete solution that allows us to drive even more revenue and offer more targeted marketing, which further helps us develop and maintain customer loyalty," said Rich Bradway, manager of Internet marketing of the Boston Symphony Orchestra, which has seen a 50 percent rise in online ticket sales since launching on ATG and has recently created new features such as the "Interactive Timeline" and the multimedia presentation "Explore the Orchestra" designed to attract a broader audience. "In addition to continually enhancing the online experience of our subscribers, we're able to manage our content and information better than ever."

Other examples of customers experiencing success on ATG 6 are:

-- Bookspan: "Book of the month club" company is creating

event-driven scenarios to push targeted promotions to

customers. www.bookspan.com

-- Cabela's: Renowned outdoor equipment maker has seen

significant increases in "impulse" purchases as well as

average order size by creating cross-sell and up-sell programs

tied directly to products being purchased on the site.

www.cabelas.com

-- Fira Internacional de Barcelona: Spain's largest convention

and trade fair center is using ATG to effectively execute and

manage the entire process of attracting, registering and

tracking the attendance of visitors to the various events

staged at the conference center each year.

Several ATG 6 customers have praised the new ATG Publishing module that automates the management and deployment of assets such as price lists, product catalogs and service information. Pioneer Investments, for example, has deployed ATG Publishing to automate the management of interactive tools and resources and has seamlessly integrated the module into its existing environment. ATG Publishing will allow Pioneer the flexibility to provide a richer site experience to its customers, while simultaneously making it easier for Pioneer employees to edit and update site content without having to endure a long publishing process as was the case with its previous content management system.

"The success that our customers are having, particularly with the new publishing model, is a testament to the commitment we have maintained to developing and evolving the ATG product suite," said John Dragoon, senior vice president product marketing, ATG. "We have consistently listened to our customers' wishes and, as a result, have built a product that is robust yet flexible enough to meet the always changing needs of their businesses."

About ATG

ATG (Art Technology Group, Inc.) is a leading provider of innovative software applications for commerce and customer self-service. Customers around the globe rely on ATG for the frontline applications that help build and manage mutually beneficial relationships. Deployed on the industry's most popular application servers, ATG's application suites for e-commerce, portals, and relationship management are ideal for integrated e-business initiatives across the enterprise.

ATG has delivered e-business solutions to blue-chip companies worldwide including Aetna Services, Inc., Alcatel, American Airlines, Barclays Global Investors, Best Buy, BMG Direct, Eastman Kodak, Ford Motor Credit, HSBC, J. Crew, Sun Microsystems, 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 our Web site at www.atg.com.

(C) 2003 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc., and Scenario Personalization is its service mark. 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 the possibility that the ATG product deployment will not be successful, on time or significantly enhance the user's Internet experience or handle user volumes; that those customers leveraging ATG won't have the opportunity to increase revenue and decrease future costs; the need to adapt to rapid changes so products do not become obsolete; the possibility of errors in ATG's software products; the possibility that the solution will not make customer implementations faster or more flexible or permit the customer to meet its customer-facing or infrastructure requirements; and the risks and costs of intellectual property litigation. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.