An extensive one-volume guide covering some 1,900 international and regional entities, this title gives detailed and accurate information on a wide spectrum of international organizations, from the International Monetary Fund to NATO.Fully revised and updated, this new 13th edition includes background material as well as useful contact details to offer a complete understanding of the role of international organizations in the framework of modern global politics. Users will benefit from brand new introductory essays covering the international humanitarian system and international environmental governance, as well as biographical details of leading officials within international organizations.