McFadyen Sponsors Launches a New & Improved ATG Users Group Web Site Showcasing the Features of ATG 6
www.AtgUsersGroup.org, the Central Forum for the ATG Community for the Past 3 Years, is Equipped with New Features & Functionality

Vienna, VA, December 20, 2002 - McFadyen Consulting, founder & manager of the ATG Users Group, today announced a beta version launch of www.AtgUsersGroup.org on the newly released ATG6. McFadyen Consulting, founder and sponsor of the ATG Users Group (ATG-UG), formerly known as the Dynamo Users Group (DUG), has completed the migration of the site from a Dynamo 5.1 non-portal site to an ATG 6 portal site featuring ATG Publishing. The final production site will formally launch in mid-January to celebrate ATG's annual summit, the ATG 2003 Open, January 27-29th Doral Resort, Miami, FL.

Over 3,000 people have become registered members of www.AtgUsersGroup.org over the past 3 years. Along with the migration and additions of new functionality, Users Group members enjoy benefits which include:

• Forums - a six-category message board containing over 14,000 posts.
• Resources - a rich technical resource library comprised of periodicals, books, videos, white papers, and web links that contain technical information relevant to those working with ATG.
• Case Studies - more than 60 case studies are posted to date with new additions frequently. Case studies enable users to see how others are creatively applying ATG-based solutions to their business needs.
• News - real-time information on the latest ATG products, partners and related technologies.
• Events - information on current industry events and those directly designed for users of the ATG platform. In many cases users can register for events directly from the www.AtgUsersGroup.org site.

ATG 6 is the latest product offering from ATG (NASDAQ: ARTG). ATG 6 will offer major enhancements to ATG Commerce, ATG Portal, and the ATG Relationship Management Platform, as well as new ATG Integrations and three new product modules. The first new product module, ATG Publishing, includes browser-based tools for adding and editing web assets and has a powerful workflow editor that provides a comprehensive solution for managing these assets. ATG Analytics provides insights into sales trends and user behavior patterns. ATG Search is designed to deliver rapid access to online product and self-service information.

With the comprehensive features that ATG 6 provides, the migration of www.AtgUsersGroup.org brought extensive enhancements to the new web site. By utilizing ATG scenario-based personalization features, the web site allows users to customize the portal to suit their own preferences. For example, users will be able to remove or add Portlets from a web page, change the layout of a web page, choose their preferred color schemes, etc. Other new features include online polls on topics regarding ATG products and ATG user concerns and a survey for ATG-related events. There are also major enhancements to current features such as a more powerful search function and a more detailed real time ATG (NASDAQ: ARTG) stock ticker. In addition to employing the latest ATG technology, the new web site also provides a fresh user experience with major changes in the graphical design.

"The ATG Users Group web site will continue to serve as the central online gathering point for the ATG user community," explained Tom McFadyen, president, McFadyen Consulting. "Being the first integrator to implement a migration to ATG 6 is very exciting for McFadyen Consulting. We see it as another opportunity to demonstrate the strength of ATG as an eBusiness platform."

About the ATG Users Group
Founded in early 2000, the ATG Users Group has stayed true to the mission statement "To bring together and make available valuable resources from experts, end-users, and ATG to enable the entire community to get the most from their IT investments". This mission is carried out via regional educational seminars and online. Regional events focus on the business and technical applications of ATG products, pulling together industry experts as speakers and showcasing case studies to demonstrate how others have experienced measurable business success through the use of ATG. Cities including Washington, D.C., New York City, Minneapolis, Boulder, and San Francisco currently have active chapters that hold events on a regular basis.

About McFadyen Consulting
McFadyen Consulting (www.mcfadyen.com) has been providing full lifecycle implementation services on large-scale IT solutions integration for over a decade. The organization combines industry best practice experience, technology expertise, and visionary strategy to create market leadership and solve critical business needs for clients. McFadyen Consulting is a leading integrator of ATG's Dynamo eBusiness platform and has completed over 20 Dynamo projects. Dynamo clients range from Fortune 500 organizations to dynamic young companies seeking differentiation online. McFadyen Consulting's expertise includes eBusiness solutions, content management, ERP integration, 3-tier architecture, object-oriented development, supply chain integration, and electronic workflow automation. In the fall of 2000 McFadyen Consulting established the ATG Users Group (DUG) that meets quarterly in the Washington, D.C. area and New York City. DUG (www.DynamoUsersGroup.org) was founded to create an unbiased, educational forum for the exchange of information and ideas for the ATG Dynamo user community.

About ATG
Art Technology Group, Inc. ("ATG") (Nasdaq: ARTG) is a leading provider of Internet customer relationship management and electronic commerce products and services. ATG offers an integrated suite of Java application server-based products and services, as well as related application development, integration and support services. ATG's Dynamo® Product Suite enables Global 1000 enterprises, as well as new businesses using the Internet as their primary business channel, to understand, manage and build their online customer relationships and to more effectively market, sell and support their products and services over the Internet. The Company is headquartered in Cambridge, MA with additional locations throughout the U.S. and in Europe.