This Handbook offers a state of the art overview of international organization. Reinalda draws from not only the fields of political science and international relations but also from organization and management studies, the sociology of social movements and international law. Focusing on the wide range of documentation and data sets available on international organizations, the contributors analyse the ideas promoted by them, processes taking place within them, actors playing their roles, structures and change, and evolving international architectures. Drawing together contributions from leading researchers in the field this work will be of great interest to all students and scholars of international organizations and global governance.