What is the English School of International Relations and why is there increasing interest in it? Linklater and Suganami provide a comprehensive account of this distinctive approach to the study of world politics which highlights coexistence and cooperation, as well as conflict, in the relations between sovereign states. In the first book-length volume of its kind, the authors present a comprehensive discussion of the rise and development of the English School, its principal research agenda, and its epistemological and methodological foundations. The authors further consider the English School's position on progress in world politics, its relationship with Kantian thought, its conception of a sociology of states-systems and its approach to good international citizenship as a means of reducing harm in world politics. Lucidly written and unprecedented in its coverage, this book is essential reading for anyone interested in international relations and politics worldwide.