MOUNTAIN VIEW, Calif., July 28, 2004 -- ILOG(R) (Nasdaq: ILOG; Euronext: ILO, ISIN: FR0004042364) today announced that Equifax, Inc., the premier information and intelligence company, has selected ILOG JRules(TM), a core offering in ILOG's Business Rule Management System (BRMS) product line, to enable an adaptable and reusable business rules-based foundation for the InterConnect(TM) product suite of Equifax Technology Solutions LLC. Designed as an application service provider (ASP) offering, Equifax InterConnect provides an integrated suite of modular components that allows companies to automate business processes, including application processing, decisioning, and the acquisition and integration of data.

Equifax, a leading credit reporting entity and provider of decisioning and analytical tools, chose ILOG JRules as an important component of its InterConnect product suite. Leveraging ILOG JRules software, InterConnect provides advanced decisioning for Equifax customers. The comprehensive features provided by ILOG JRules significantly accelerates time-to-market for customer products and services.

"The high performance and scalability of ILOG JRules offers InterConnect customers the tools and resources they need for successful business rules management," said Steve Ely, senior vice president, product management, Equifax. "The combination of ILOG's BRMS and Equifax's analytics and decisioning expertise provides a superior solution for customers in all markets served by Equifax including financial services, telecommunications and utilities."

Embedded within InterConnect's technology infrastructure, ILOG JRules supports a centralized foundation for business rules that can be tailored to meet specific customer needs. Ranging from point of sale risk management and marketing decisioning to loan requests and small business decision support, InterConnect customers rely on business rules to determine customer eligibility and product offers as well as facilitate compliance with state and federal regulations.

"Equifax's advanced technology and industry expertise are a valuable asset to companies trying to streamline strategic business applications such as credit evaluations, mortgage lending, and portfolio management processing, said Bob Cooper, vice president, ILOG. "ILOG has a proven history with leaders in the industry segments that Equifax serves. We look forward to working with Equifax and their Interconnect customers as they extend their use of business rules beyond Interconnect and across the enterprise."

ILOG has consistently built on its history of product innovation to make ILOG JRules the industry's leading business rule software. For the second year in a row, ILOG has been named to the leader quadrant of Gartner's Magic Quadrant for Business Rule Engines. ILOG's BRMS provides a competitive advantage for many strategic business applications. Compliance solutions powered by ILOG JRules monitor high volumes of data in real time, enabling the immediate detection and reporting of faulty or fraudulent information. For business process management, ILOG JRules enables the effective management of the complex, dynamic rules that can number in the thousands for a discrete business process, maximizing business agility. Customers of the award-winning ILOG JRules include CitiStreet, VSP, eBay, Zurich, MetLife, Sabre and other leading Global 2000 companies and governments worldwide.

About ILOG

For more than 10 years, ILOG's innovative enterprise-class software components and services have helped companies maximize their business agility and improve operating efficiency. Over 1,000 global corporations and more than 300 leading software vendors rely on ILOG's business rules, optimization and visualization technologies to achieve dramatic returns on investment, create market-defining products and services, and sharpen their competitive edge. For more details, please visit http://www.ilog.com.

NOTE: ILOG is a registered trademark, and JRules is a trademark, of ILOG. InterConnect is a trademark of Equifax. WebSphere is a trademark of IBM. All other trademarks are the property of their respective owners.

Forward-looking Information

This release contains "forward-looking" information within the meaning of the United States Securities laws that involve risks and uncertainties that could cause actual results to differ materially from those in the forward-looking statements. Potential risks and uncertainties include, without limitation, the management and proper utilization of ILOG JRules in InterConnect, and those risks and uncertainties mentioned under "Risk Factors" in the company's form 20-F for the year ended June 30, 2003, which is on file with the United States Securities and Exchange Commission.

SOURCE ILOG, Inc.

Web Site: http://www.ilog.com