This volume explores the theoretical value of applying rational choice theory to questions of regional integration. As with other questions of conflict and cooperation in the field of international politics, studies of European integration are divided largely between the realist and liberalist perspectives. Yet neither of these schools of thought aptly explains the dynamics characterizing this process, that is, the major advances in regional integration and the long periods of paralysis. The contributions in this volume work their way from the most general questions and macro-processes down to particular policy problems of the European Union and the micro-foundations of interstate cooperation. The work will be of interest to scholars and policymakers in international relations, international economics, and European studies.