This book applies established analytical concepts such as influence, authority, administrative styles, autonomy, budgeting and multilevel administration to the study of international bureaucracies and their political environment. It reflects on the commonalities and differences between national and international administrations and carefully constructs the impact of international administrative tools on policy making. The book shows how the study of international bureaucracies can fertilize interdisciplinary discourse, in particular between International Relations, Comparative Government and Public Administration. The book makes a forceful argument for Public Administration to take on the challenge of internationalization.