Following an assessment of the importance of international cooperation in overall U.S. terrorism policy, a chapter describes the nature and development of standards for defining State-sponsored international terrorism as the basis for collective action against it. Two chapters review the efforts of the Summit Seven to apply or enforce some of these international norms. This includes a discussion of the main joint declarations of the United States and its allies in relation to specific categories of terrorism. An analysis of collective actions to these States in response to six selected terrorist incidents addresses hijacking, hostagetaking, abuse of diplomatic immunities, shootings, and bombings. These incidents present a varied picture of counterterrorism successes and failures. The book then draws some conclusions about the essential elements of a collective response to State-supported terrorism. The recommended strategy involves consensus, credibility, clarity, and consistency. Appended declarations of the summit Seven on International Terrorism, 1978-1987; chapter notes; subject index.