IDC Cites Success of DSET's Alliance Program

International IT Research Firm Names DSET a "Winner" in Building Essential Industry Relationships

Bridgewater, NJ - June 28, 2001 - (Nasdaq: DSET) - DSET Corporation announced today that it has been cited for the effectiveness of its industry alliance efforts in a recent study issued by IDC, a prominent international IT research and consulting company. The title of the study is "Strategic Alliances 2001: Winners, Innovators, and the Next Generation."

Alliances among complementary companies are viewed as one of the keys to success in today's market climate. And although the study states that less than 50% of alliance managers surveyed felt their alliances were meeting initial expectations, there are a number of examples of successful strategic software alliances employing leading alliance best practices. DSET is profiled in the report's "Winner" category along with Commerce One and IBM as an example of an organization that has been especially successful in establishing mutually beneficial relationships with alliance partners.

"These companies have demonstrated what can be achieved when senior executives at both alliance partners champion the relationship as a key business strategy," said Nicole Gallant, strategic software alliances analyst at IDC and author of the report. "IDC research shows that resources and management infrastructure are key factors in successful alliances, and senior-executive alliance 'converts' play a key role in the internal resources allocated for alliance management and implementation. Successful alliances don't just happen - they need planning. These companies 'get it'."

"IDC's report is one more validation of our strategy for partnering with other industry leaders to expand the utility and accessibility of DSET's software solutions," said John Scheifele, director of strategic alliances at DSET. "These relationships enable us to offer the capabilities of DSET products to more customers in more diverse markets, and to do so at significantly lower cost to users."

About IDC:

IDC is the foremost global market intelligence and advisory firm helping clients gain insight into technology and ebusiness trends to develop sound business strategies. Using a combination of rigorous primary research, in-depth analysis, and client interaction, IDC forecasts worldwide markets and trends to deliver dependable service and client advice. More than 700 analysts in 43 countries provide global research with local content. IDC's customers comprise the world's leading IT suppliers, IT organizations, ebusiness companies, and the financial community. IDC is a division of IDG, the world's leading IT media, research, and exposition company. IDC's Web site can be viewed at www.idc.com.

About DSET:

DSET is a leading supplier of software known as electronic-bonding gateways and the related services that enable service providers in the telecommunications industry to implement an automated Trading Partner Network (TPN). A TPN plays a critical role in lowering the cost of acquiring customers, reducing the amount of time required to turn on services for new customers, and minimizing the time required to resolve service outages to ensure higher customer satisfaction and less customer turnover. DSET provides the installation, training, interoperability-testing, and maintenance services needed to put TPNs into production and maintain them efficiently. DSET is headquartered in Bridgewater, New Jersey, and the company's Web site can be viewed at www.dset.com.

Statements regarding financial matters contained in this press release, other than historical facts, are forward-looking. Since all statements about DSET's plans, estimates, and expectations are based on current projections that involve risks and uncertainties, and are subject to change at any time, the company's actual results may differ materially from expected results. Investors should consider these risks and uncertainties, which are discussed in documents filed by DSET with the Securities and Exchange Commission. These documents identify important factors that could cause the actual results to differ materially from those contained in the projections or forward-looking statements. DSET expressly disclaims any obligation to update any forward-looking statements.

x x x

DSET Contacts:

Media Relations: Dean Maskevich, Marketing Communications, 908-526-7500 Ext. 1366,
e-mail: dmaskevi@dset.com

Investor Relations: John P. Murphy, Westfield Investor Relations, 908-233-1558, e-mail: westfieldir@worldnet.att.net

DSET and the DSET logo are registered trademarks of DSET Corporation.

All other trademarks are the property of their respective owners.