The following press release provides insight on industry trends and behaviors impacting all players involved in clinical research as analyzed and reported by CenterWatch.

Drug Information Association and CenterWatch establish agreement to deliver clinical research information and educational services to professionals around the world.

HORSHAM, PA - January 27, 2003 - The Drug Information Association (DIA), and CenterWatch, a division of Thomson Healthcare (NYSE: TOC; TSX: TOC), today announce a collaborative agreement to disseminate clinical trials information and resources to industry professionals worldwide. Through this agreement, DIA will distribute CenterWatch's award-winning news and information services to biopharmaceutical companies, regulatory agencies and other pharmaceutical and related healthcare industry professionals. Ultimately, this collaboration of complementary products, services, and constituents, will help advance international pharmaceutical research and development.

DIA is an international organization which annually provides more than 100 meetings, training courses, and symposia for nearly 30,000 members from the pharmaceutical industry, government regulatory agencies, academic institutions and contract service organizations (CSOs). As part of this collaborative agreement, CenterWatch will provide its publications, training guides, news reports, clinical research investigator profiles, investigational drug profiles and career development information to DIA members in order to assist biopharmaceutical companies and other industry professionals in more effectively managing and conducting all aspects of their clinical research studies. In addition, given its broad publishing reach, CenterWatch will promote DIA membership to more than 35,000 international clinical research investigators.

This collaborative agreement establishes an ongoing process for CenterWatch and DIA to jointly deliver, throughout the world, a more complete continuum of practical and valuable information for pharmaceutical and research professionals.

"DIA has always had a reputation for providing high quality educational programs for pharmaceutical industry professionals," said Kenneth Getz, President & CEO, CenterWatch. "We are thoroughly delighted to be not only providing our information services to DIA members, but to also be raising awareness of the value of DIA membership among investigative sites."

ABOUT DIA
For nearly four decades, DIA has provided professionals involved in the discovery, development, evaluation and utilization of medicines and related health care technologies with professional and career development resources and training to help them deliver effective medicines to patients as quickly and safely as possible. As an organization deeply committed to preserving and protecting the health and well-being of all the world's people, DIA aims to provide everyone involved in this process, from research through marketing, with the most current and accurate information available.

DIA has evolved from a founding group of thirty U.S. professionals employed in academia and the pharmaceutical industry into an international organization which annually holds more than 100 meetings, training courses, and symposia for nearly 30,000 members from the pharmaceutical industry, government regulatory agencies, academic institutions, contract service organizations (CSOs), and other bodies, around the world.

ABOUT CENTERWATCH
Thomson CenterWatch (www.centerwatch.com) is a Boston-based publishing and information services company that focuses specifically on the clinical trials industry. Its fact-based and objective coverage and analyses have earned CenterWatch the distinction of being regarded as the source for authoritative and comprehensive news, information and insight.

CenterWatch provides a wide variety of publications and information services to pharmaceutical and biotechnology companies, CROs, SMOs, and investigative sites involved in the management and conduct of clinical trials. CenterWatch also provides educational materials for healthy professionals, patients, and health consumers. CenterWatch provides market research and market intelligence services that many major companies have retained to help develop new business strategies, to guide the implementation of new clinical research-related initiatives, and to assist in due diligence activities.

CenterWatch is a business within The Thomson Corporation (www.thomson.com). With 2001 revenues of $7.2 billion, Thomson is a global leader in providing integrated information solutions to business and professional customers. Thomson provides added-value information, software applications, and tools to more than 20 million users in the fields of law, tax, accounting, financial services, higher education, reference information, corporate training and assessment, scientific research, and healthcare. The corporation's common shares are listed on the New York and Toronto stock exchanges (NYSE: TOC; TSX: TOC).

FOR MORE INFORMATION
Please contact Joan Kroll, Director, CenterWatch Marketing & Promotional Sales, at (617) 856 - 5900, or Kate Strauser, Worldwide Director of DIA Member Services and Communications, at (215) 442 - 6178, for more information.

# # #