The study of compliance with international agreements has gained momentum over the past few years. Since the conclusion of World War II, this research agenda had been marginalized by the predominance of realist approaches to the study of international relations. However, alternative perspectives have developed that suggest that international law and institutions are important influences on the conduct of international politics. This review examines four perspectives and assesses their contribution to understanding the conditions under which states comply with international agreements. Despite severe conceptual and methodological problems, this research has contributed significantly to our understanding of the relationship between international politics and international law and institutions.