In this volume, fourteen distinguished specialists in international political economy thoroughly explore the concept of international regimes—the implicit and explicit principles, norms, rules, and procedures that guide international behavior. In the first section, the authors develop several theoretical views of regimes. In the following section, the theories are applied to specific issues in international relations, including the General Agreement on Tariffs and Trade (GATT) and on the still-enduring postwar regimes for money and security.