Ben Rosamond provides an accessible and critical introduction to the full range of classical and contemporary perspectives on integration theory. He explains the centrality of theoretical work to the study of integration and the EU and locates different theories within their wider intellectual and ''real world'' contexts. The book engages with the key debates to have arisen from theoretical deliberations about European integration. It emphasizes the importance of ''sociology of knowledge'' questions when evaluating integration theory and stressing the continued significance of international theory to the study of the EU.