PSDI CITED AS LEADING SUPPLIER OF MAINTENANCE MANAGEMENT SOFTWARE

Automation Research Corporation Study Indicates Market to Top 1.3 Billion
by the Year 2000

CAMBRIDGE, MASS., MAY 2 -- PSDI (Nasdaq: PSDI) today announced that it has
been recognized as the 1995 leading supplier of maintenance management
software, according to a study published on April 26, 1996 by Automation
Research Corporation (ARC). With PSDI's recent acquisition of Maintenance
Automation Corporation, PSDI is now the world's largest provider of
maintenance management software and services.

The study, entitled "Computerized Maintenance Management Systems(CMMS)
Global Outlook," indicates that worldwide maintenance management revenue
was greater that $550 million in 1995 and is expected to exceed $1.3
billion by the year 2000. The study also indicates that there is growth in
all aspects of the maintenance management market, from standalone PC
applications to large, multi-site applications. The overall market is
expected to grow almost 30% from 1995 to 1996 with an average annual
growth rate of nearly 19% through the year 2000.

"The ARC study confirms the acceptance of our products across all market
segments," said Dean Goodermote, PSDI president. "We have retained our
leading position in facilities maintenance and discrete manufacturing, and
have become one of the top four providers of maintenance software to the
process industry, a market segment we have targeted with specific
technical product enhancements over the past two years."

According to the ARC study, the CMMS market is expected to exceed the
billion dollar level by 1998. This is largely due to the realization by
manufacturers that return-on-investment and the bottom-line savings are
imperative in gaining a competitive advantage. ARC acknowledges that over
the past two years, manufacturers have pared expenses to a bare minimum,
and recognized that maintenance management software greatly benefits both
the supplier and the user by maximizing plant output and reducing
emergency shutdowns.

Asserting the significance of the market's shift to client/server
technology, ARC estimates that by the year 2000, 80% of the maintenance
management software revenues will be from client/server systems. "PSDI led
the migration to client/server CMMS solutions beginning in 1991, and the
company's leadership and innovation have paved the way for many of the
major suppliers to adopt this technology," said Steve Clouther, ARC vice
president. "PSDI has taken advantage of the growing acceptance of the
advancements in enterprise maintenance management technology, and this
study confirms its tremendous momentum in this market."

Automation Research Corporation is a leading international market research
and management consulting firm focusing exclusively on the industrial
automation marketplace. ARC provides strategic planning and technology
assessment services to major industrial systems integrators, users, and
suppliers. Further information can be obtained from ARC, Three Allied
Drive, Dedham, MA 02026. Tel: 617-461-9100.Fax: 617-461-9101. Internet:
choward@arcresearch.com.

PSDI develops, markets and supports applications software used by
businesses, government agencies, and other organizations to assist them in
maintaining high-value capital assets such as plants, facilities and
production equipment. The Company's products are designed to enable
customers to reduce downtime, control maintenance expenses, cut spare
parts inventories and costs, improve purchasing efficiency, and more
effectively deploy productive assets, personnel and other resources.

Based in Cambridge, Mass., PSDI markets its products through a direct sales
force with sales offices throughout the United States, Canada, Australia,
UK, France, Germany, Sweden and the Netherlands, combined with a network
of international sales agents.
 
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