ATG Enhances Customer Experience Platform to Help Companies Make More Informed Business Decisions.

CAMBRIDGE, Mass. -- ATG Enhances Commerce Suite and Announces Analytic Offerings to Provide Detailed Insight into Business Performance on the Web

ATG (Art Technology Group, Inc., NASDAQ: ARTG), the software provider behind the Web's richest customer experiences, today unveiled powerful solutions designed to enhance the ability to assess and improve online marketing, sales, and service effectiveness. The new offerings will include analytics support that combines market-leading technology and new ATG commerce enhancements. By providing business users with these offerings to obtain faster, more accurate data collection and reporting, companies that use ATG solutions will be able to better understand their customers, drive new Web sales and provide a richer online experience for their customers.

One enhancement to the ATG Customer Experience Platform comes in the form of a new strategic technology and sales alliance between ATG and Coremetrics, a leading provider of hosted analytic solutions. The offering, built by ATG, will integrate robust, easy-to-use auto-tagging features with Coremetrics' data collection and reporting offering to enable the measurement of e-business applications.

"Utilizing Web site customer data has become a critical aspect of a company's ability to create and maintain an online relationship," said Adam Sarner, analyst, CRM Research Practice, Gartner, Inc. "The ability to automate laborious processes on the back end and speed the flow of data and analysis so it can be used quickly is a powerful value proposition both to the business and IT user as organizations strive to increase customer satisfaction."

ATG also announced today several enhancements to its industry-leading ATG Commerce solution designed to provide companies with detailed information on the effectiveness of online business initiatives. These new enhancements include an enhanced shopping cart abandonment feature and business process tracking capabilities.

ATG's shopping cart abandonment feature tracks and analyzes abandonment rates at a more granular level than traditional tools. Shopping cart abandonment is typically measured by simply calculating a rate based on non-purchase in a single site visit. ATG tracks the purchase or non-purchase of items over time when a user leaves a shopping cart and returns to it - whenever they return.

Similarly, ATG's new business process tracking capabilities allow business managers and IT staff to effectively define and track various stages in the purchasing cycle. Companies can also generate reports that evaluate site performance and buyer behavior while identifying areas of improvement.

Today's announcements represent the most recent enhancements ATG has made to the ATG Customer Experience Platform. ATG renamed its suite of products in March when the company introduced ATG Adaptive Customer Assistance and ATG Campaign Optimizer solutions (see releases dated March 15).

"These additions to the ATG Customer Experience Platform strengthen our product offering while reinforcing our commitment to provide our customers with the information they need to make better business decisions," said Cliff Conneighton, ATG senior vice president of marketing. "The addition of ATG analytical enhancements strengthens the testing, data capture and reporting capabilities present in all of our solutions while further cementing our position as the leading vendor to provide a complete solution to maximize the entire customer experience lifecycle of marketing, sales and service."

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., ATG Adaptive Customer Assistance 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; that the ATG product will not continue to be integrated with third party applications or application servers or will not support all Web services enabled systems; that ATG's product strategy may change in the future; 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.