Health technology assessment (HTA) has increasingly become a valuable tool to examine effectiveness, quality of care, patient outcomes, and cost-effectiveness of health care technologies. In 1994 and 1995, a survey was conducted to document the scope of worldwide HTA activities; 103 organizations from 24 countries responded. This paper summarizes the results of this international survey, including a description of each country's program, types of technologies assessed, methodologies used, and dissemination approaches. Results for Canada, the United States, and European and other countries are presented separately.