'An outstanding volume edited by two leading scholars of EU studies, this is one of the most sophisticated and systematic treatments of Europe’s "age of crisis"’ that I have seen. Ecumenical in its approach, the chapters test old and new theories of European integration against the crises of the last decade. The editors have done an excellent job in ensuring the coherence of the volume. The final result is far more than just the sum of its parts.'Christopher Bickerton, University of Cambridge, UK.'Drawing on new research, this volume highlights the strengths and weaknesses of current theories of European integration. The authors provide a comprehensive guide to our understanding of the European Union and how it has responded to the crises of the past decade. The result is a diverse, engaging, and deeply informative volume that is a valuable resource for students of European politics.'Gary Marks, UNC-Chapel Hill, USA, and European University Institute, Italy.