EXHIBIT 2.1 AGREEMENT AND PLAN OF MERGER Dated as of March 23, 1998Merger Agreement • April 2nd, 1998 • Walsh International Inc \De\ • Services-computer programming services • New York
EXHIBIT 2.2 STOCK OPTION AGREEMENT STOCK OPTION AGREEMENT, dated as of March 23, 1998 (the "Agreement"), by and between Walsh International Inc., a Delaware corporation ("Issuer"), and Cognizant Corporation, a Delaware corporation ("Grantee")....Stock Option Agreement • April 2nd, 1998 • Walsh International Inc \De\ • Services-computer programming services • New York
