This book addresses how international organizations with a global reach, such as the UN and the WTO, have changed the mechanisms and reasoning behind the making, implementation, and enforcement of international law. Alvarez argues that existing descriptions of international law and international organizations do not do justice to the complex changes resulting from the increased importance of these institutions after World War II, and especially from changes after the end of the Cold War. In particular, this book examines the impact of the institutions on international law through the day to day application and interpretation of institutional law, the making of multilateral treaties, and the decisions of a proliferating number of institutionalized dispute settlers.