LAKE FOREST, Calif., March 2, 2004 -- Wonderware, a business unit of Invensys Systems, Inc., today announced that Control magazine readers have awarded Wonderware first place in the HMI and SCADA software categories as part of the magazine’s 2004 “Readers’ Choice Awards.”

Earning 36 percent of the vote, with the second place winner at 22 percent, 2004 is the 10th consecutive year that Wonderware ranked No. 1 in the “Software, Human Machine Interface” category. The Wonderware HMI has ranked first for HMI since Control magazine began offering an HMI category in 1995. Wonderware’s SCADA software earned 25 percent of the Control readers’ votes, jumping 14 percent from last year’s 11 percent second-place ranking.

“Control magazine’s Readers’ Choice Awards are truly representative of the performance of the companies that are selected,” said Walt Boyes, editor-in-chief of Control magazine. “In both the product and services categories, companies like Wonderware show year after year that, in a completely fair and unbiased poll, they continue to provide quality to their users. The poll is conducted via e-mail to a carefully cleaned and screened list, which allows one vote per respondent. The questions are open-ended and a company has to receive at least 5 percent of the votes in a category to be listed.”

As part of the magazine’s 12th annual awards program, Control editors surveyed more than 24,000 selected subscribers. The readership was asked to name the top vendors in 65 industrial automation technology categories and rate their customer service.

“The readers of Control magazine are experts in their fields and their selection of Wonderware applications for the magazine’s Readers’ Choice Awards marks a significant achievement for Wonderware and Invensys,” said Steve Lewarne, vice president of marketing. “This award recognizes that Wonderware keeps the needs of its customers top-of-mind when developing products -- and we will continue our efforts to bring innovative products to the manufacturing and industrial automation marketplace.”

About Wonderware HMI and SCADA Products

Wonderware’s InTouch HMI software is designed for visualization and industrial process control. Its powerful wizards enable users to quickly create and deploy customized applications that connect and deliver real-time information. In addition, Wonderware offers a full range of products for SCADA including SCADAlarm event-notification software; the IndustrialSQL Server real-time plant historian; ActiveFactory reporting and analysis clients; SuiteVoyager portal software; InTouch HMI software; and the Industrial Application Server, which is built on the ArchestrA software architecture.

About Invensys’ Wonderware and ArchestrA Business Units

Wonderware and ArchestrA are business units of Invensys Systems, Inc. Wonderware is the world’s leading supplier of industrial automation and information software. Founded in 1987, Wonderware pioneered the use of the Microsoft® Windows® operating system in HMI automation software for manufacturing operation systems. Wonderware software powers intelligent plant decisions in real time. ArchestrA technology provides a unified set of software services that enables every system in your plant, working in concert.

Based in Lake Forest, Calif., the Wonderware and ArchestrA business units have regional sales and development offices throughout North America, Europe, Latin America and Asia to provide support to its network of more than 160 distributor offices. Wonderware has approximately 300,000 software licenses in approximately 100,000 plants worldwide, which is about 30 percent of the world’s 335,000 plants with 20 or more employees. For more information about ArchestrA technology, visit www.invensys.com/archestra or www.archestra.biz.

About Invensys

Invensys is a global leader in production technology and solutions. The group helps customers improve productivity, performance and profitability using innovative services and technologies and a deep understanding of their industries and applications. Invensys business units work closely with customers to increase performance of production assets, maximize return on investment in production and data management technologies and remove cost and cash from the supply chain.

Leading Invensys brands focused on production management include APV, Avantis, Eurotherm, Foxboro, IMServ, SimSci-Esscor, Triconex and Wonderware. These businesses address process and batch industries -- including oil and gas, chemicals, power and utilities, food and beverage, and personal health care -- and the discrete and hybrid manufacturing sectors. Invensys operates in more than 60 countries, with its headquarters in London. For more information, visit www.invensys.com.

# # #

Invensys, Wonderware, InTouch, SCADAlarm, IndustrialSQL Server, ActiveFactory, SuiteVoyager, ArchestrA, APV, Avantis Eurotherm, Foxboro, IMServ, SimSci-Esscor, and Triconex are trademarks of Invensys plc, its subsidiaries and affiliated companies. All other brands and product names may be the trademarks of their respective owners.