ATG Unveils the Industry`s Most Complete Platform for Guided, Adaptive Customer Experience

Building on history of innovation and enhancing award-winning technologies, new ATG applications create the most productive and relevant customer experience across a company`s marketing, sales and service offerings

CAMBRIDGE, Mass. - March 15, 2004 - Drawing on its long history of technology vision and market leadership, ATG (Art Technology Group, Inc., NASDAQ: ARTG), today announced major enhancements to its Customer Experience Platform (formerly known as ATG Relationship Management). This flagship product line enables consumer-facing companies to provide their customers with a consistent, guided, adaptive experience, online and via other channels. With ATG, consumers can find what they want, do more business online, and have a more satisfying self-service experience. As a result, companies increase their revenues, productivity and profit.

"ATG, a leading provider of commerce and self-service applications, is tackling the paradox that the empowered customer is in charge by delivering its customer base additional presales and post-sales solutions designed to empower online consumers with dynamic self-serviced environments," said Kent Allen, Research Director at Aberdeen Group.

With ATG`s announcement today of ATG Campaign Optimizer and ATG Adaptive Assistance (see separate releases dated March 15), the ATG Customer Experience Platform spans the entire customer lifecycle from marketing through sales and service. Companies can create personalized, scenario-driven interactions and campaigns that can be comparatively tested and measured for effectiveness. Once engaged with a customer, ATG solutions allow customers to provide guidance for site visitors with contextual self-service options powered by intuitive natural language navigation tools.

"Our new products represent the next generation of e-business technology to help businesses guide their customers through an experience that keeps them coming back for more," said Bob Burke, president and CEO, ATG. "Research has shown that while online business continues to grow exponentially, consumers have grown increasingly frustrated with the service and attention they receive online. ATG`s Customer Experience Platform is the first to address both sides of the equation to provide companies with revenue generating tools and customers with a guided online experience that mirrors an exceptional offline interaction."

According to the U.S. Commerce Department, online sales increased 26 percent in 2003 to a total of $55 billion, with Forrester Research predicting that sales will grow by an additional 25 percent in 2004. Still, Forrester found that in more than half the cases, online consumers fail to reach their goals, and Jupiter Research found that half of all consumers are dissatisfied with site search capabilities.

The ATG Customer Experience Platform addresses these concerns through a robust set of self-service offerings, built on top of the ATG Adaptive Scenario Engine to create an intuitive, completely personalized information retrieval process. A comprehensive, integrated eBusiness Suite allows companies to more effectively market and communicate with their customers based on personal information and shopping preferences gleaned throughout the process.

In addition, ATG has also released updates to ATG Portal, ATG Content Administration (formerly known as ATG Publishing), and ATG Adaptive Scenario Engine. This updated release includes support for the JSR 168 portlet standard, improved JSP template support within the Content Administration product and support for JDK 1.4.

"One of the disconnects in online business today is that companies are able to offer users a myriad of options and capabilities, but either don`t provide users with enough guidance or don`t learn enough to communicate with that user properly," continued Burke. "With our new offerings and product roadmap, we are enabling our customers to capitalize on the next wave of growth in online commerce."

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 and guided 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.

©2004 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc., and Customer Experience Platform 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 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.