The current decade has been characterized by a resurgence of interest in the law of public international organizations. This fourth, revised edition of International Institutional Law covers the most recent developments in the field. Although public international organizations such as the United Nations, the International Monetary Fund, the World Trade Organization, the European Bank for Reconstruction and Development and the European Union have broadly diverging objectives, powers, fields of activity and numbers of member states, they share a wide variety of institutional problems. In this study, the law of individual organizations is not described separately. Instead the book offers a comparative analysis of the institutional law of international organizations. It includes comparative chapters on the rules and practices concerning, for example, membership, decision-making, financing, legal order, supervision and sanctions, legal status and external relations. The book has been designed to appeal to both academics and practitioners.