The English School is an underutilized research resource and deserves a larger role in IR than it currently has. Its distinctive elements are its methodological pluralism, its historicism, and its interlinking of three key concepts: international system, international society and world society. International society is the main focus, and the via media, between the other two, but more work needs to be done to develop the School's theoretical position, particularly in understanding the relationship between international and world society. In order to realize its potential, the English School needs both to construct a more coherent research agenda and to recover some of the working method of the British Committee. It is potentially a way of challenging the theoretical fragmentation that afflicts IR, and of setting up the foundations for a return to grand theory.