The conference brought together 144 participants, both government officials and members of the research community, from 13 nations to discuss international terrorism. The conference had three objectives. (1) It provided an opportunity to examine recent events, identify any new trends in terrorism, and exchange information on countermeasures. (2) It gave participants a chance to review more generally what had been learned about the phenomenon of terrorism in the 1970s and to explore its possible future course in the 1980s. (3) It identified the means by which individual research efforts in various countries could be coordinated and the results of this research shared. The conference addressed four areas: the terrorist environment, the terrorist mindset, the government response, and the future course of terrorism. This report summarizes the discussion in these four areas. It also includes eleven contributed papers that were used as resource material for the discussion.