A&E Television Networks Selects ATG Campaign Optimizer To Increase Visibility into Consumer Purchasing Decisions.

Business Editors/High-Tech Writers

CAMBRIDGE, Mass.--(BUSINESS WIRE)--May 19, 2004

Multimedia Company Purchases ATG Campaign Optimizer

to Assist in Enhancing Online Customer Experience

ATG (Art Technology Group, Inc., NASDAQ: ARTG), the software provider behind the Web's richest customer experiences, today announced that A&E Television Networks (AETN), a global multimedia company that includes The History Channel(R) and A&E, has purchased ATG Campaign Optimizer(TM) as part of the evolutionary development of its online channel, which is powered by ATG technology.

Through its use of ATG Campaign Optimizer, AETN will be able to immediately increase its ability to conduct extensive split-testing of promotions and online content to more accurately examine the purchasing decisions and preferences of its customers. Unlike traditional split-testing solutions, ATG Campaign Optimizer offers business users the flexibility and ease-of-use necessary to conduct multiple tests simultaneously.

"Understanding which promotions and content are resonating more with customers is critical to our ability to provide the best possible online experience," said So Young Park, director of E-Commerce at A&E Television Networks. "Since initially launching on its technology in 2001, we have worked closely with ATG to transform our online channel into a vital component to our overall business success."

"A&E Television Networks continues to be at the forefront of a group of organizations that truly understands the potential of the online channel and the importance of interacting with customers in a meaningful way," said Cliff Conneighton, senior vice president of marketing, ATG. "As A&E continues to utilize ATG technology to create the best possible experience for their users, they can now change promotions and offerings for these customers on the fly, which is a win for the customers because they are offered relevant products they desire, and it is a win for A&E because they can make fast changes without tying up IT resources."

ATG unveiled ATG Campaign Optimizer and ATG Adaptive Customer Assistance(TM) in March 2004 as part of the ATG Customer Experience Platform.

About A&E Television Networks

A&E Television Networks, a joint venture of The Hearst Corporation, ABC, Inc. and NBC, is an award-winning, international media company offering consumers a diverse communications environment ranging from television programming, magazine publishing, web sites, books, music CDs to DVDs/home videos, as well as supporting nationwide educational initiatives. AETN is comprised of A&E, The History Channel(R), The Biography Channel(R), History International, AETN Consumer Products, and AETN International. The A&E web site is located at www.AETV.com, BIOGRAPHY(R) at www.Biography.com, and The History Channel at www.HistoryChannel.com.

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. 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.