In the aftermath of the British referendum to leave the European Union and the European Commission's 'White Paper on the Future of Europe', it is not only time to take stock of the existing literature on differentiated integration, but also to rethink the perimeters of disintegration. We argue that phenomena such as Brexit embrace forms of differentiation which trigger the need for conceptualizing differentiated disintegration altogether. This article first sketches the path of the scholarly debate in a chronological way to grasp the breadth of existing literature. Second, it discusses differentiated disintegration as a potentially new area for research. Mapping several scenarios for future research, we propose that differentiated (dis)integration needs to be conceived as a negotiated, but profoundly path-dependent process, which is structurally locked-in, and deeply conditioned by pre-existing organizations and institutions of European integration.

Assessing the consequences of Brexit on EU policies, institutions and members, this book discusses the significance of differentiation for the future of European integration. This book theoretically examines differentiated integration and disintegration, focuses on how this process affects key policy areas, norms and institutions of the EU, and analyses how the process of Brexit is perceived by and impacts on third countries as well as other organizations of regional integration in a comparative perspective. This edited book brings together both leading and emerging scholars to integrate the process of Brexit into a broader analysis of the evolution, establishment and impact of the EU as a system of differentiation. This book will be of key interest to scholar and students of European Union politics, European integration, Brexit, and more broadly to Public Administration, Law, Economics, Finance, Philosophy, History and International Relations.

The Routledge Handbook of Differentiation in the European Union offers an essential collection of groundbreaking chapters reflecting on the causes and consequences of this complex phenomenon. With contributions from key experts in this subfield of European Studies, it will become a key volume used for those interested in learning the nuts and bolts of differentiation as a mechanism of (dis)integration in the European Union, especially in the light of Brexit. Organised around five key themes, it offers an authoritative "encyclopaedia" of differentiation and addresses questions such as: How can one define differentiation in the European Union in the light of the most recent events? Does differentiation create more challenges or opportunities for the European Union? Is Europe moving away from an "ever closer Union" and heading towards an "ever more differentiated Union", especially as leading political figures across Europe favour the use of differentiation to reconcile divergences between member states? This handbook is essential reading and an authoritative reference for scholars, students, researchers and practitioners involved in, and actively concerned about, research in the study of European integration. As European differentiation is multifaceted and involves a wide range of actors and policies, it will be of further interest to those working on countries and/or in policy areas where differentiation is an increasingly relevant feature. The Introduction and chapters 13, 21, 30, and 35 of this book is available for free in PDF format as Open Access from the individual product page at www.routledge.com. It has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives 4.0 license.

The British referendum on continuing membership of the European Union (EU) in June 2016 represented a turning point in the relationship between the United Kingdom (UK) and the EU. This book investigates the implications of Brexit for the EU and the UK, placing this assessment in the context of the long-term evolution of UK-EU relations. The authors relate these findings to debates within the literature on EU policy-making, comparative politics, and political economy. The first part of this comprehensive volume explores the implications of Brexit for key policy areas, namely the single market, finance, and migration. The policies selected are those in which the consequences of Brexit are likely to be most significant because they are linked to the ‘four freedoms’ in the Single Market. The second part of the book explores important ‘horizontal’ or thematic issues, namely lessons from Brexit for theories of integration, the balance of power in the EU amongst the main member states post-Brexit, the evolution of the domestic political contestation in the EU, and the impact of Brexit on domestic politics in the UK. This book was originally published as a special issue of the Journal of European Public Policy.

Differentiation is becoming an increasingly salient feature of European integration. The multifaceted European crisis and the subsequent Brexit vote (paving the way for a ground-breaking case of differentiated disintegration) have led scholars and practitioners to think about the consequences of differentiated integration. This article draws on five empirical models of differentiation experienced by countries both inside and outside the EU: the European economic area model, the Danish model of (quasi-)permanent differentiation, the Swedish model of de facto differentiation, the instrumental model and the Brexit process of differentiation. It addresses the different risks and opportunities that each of these models entail. The article also introduces the contributions to this symposium, which aims at paving the way for future research on the consequences of differentiation in light of Brexit. This article is part of the 2019 Symposium titled 'Responding to Brexit: Differentiated integration and disintegration in the European Union', which also includes On the Methodology of Studying Differentiated (Dis)integration: Or How the Potential Outcome Framework Can Contribute to Evaluating the Costs and Benefits of Opting In or Out by Marian Burk and Dirk Leuffen (), The End of Exceptionalism and a Strengthening of Coherence? Law and Legal Integration in the EU Post-Brexit by Paul James Cardwell (), Differentiated (Dis)integration in Practice: The Diplomacy of Brexit and the Low Politics of High Politics by Øyvind Svendsen and Rebecca Adler-Nissen () and Rethinking Britain's Role in a Differentiated Europe after Brexit: A Comparative Regionalism Perspective by Philomena Murray and Alex Brianson ().

Far from displaying a uniform pattern of integration, the European Union varies significantly across policy areas, institutional development and individual countries. Why do some policies such as the Single Market attract non-EU member states, while some member states choose to opt out of other EU policies? In answering these questions, this innovative new text provides a state-of-the-art introduction to the study of European integration. The authors introduce the most important theories of European integration and apply these to the trajectories of key EU policy areas – including the single market, monetary policy, foreign and security policy, and justice and home affairs. Arguing that no single theory offers a completely convincing explanation of integration and differentiation in the EU, the authors put forward a new analytical perspective for describing and explaining the institutions and policies of the EU and their development over time. Written by a team of prominent scholars in the field, this thought-provoking book provides a new synthesis of integration theory and an original way of thinking about what the EU is and how it works.

This book examines differentiated integration in Europe, providing incisive analyses of domestic politics determinants – political conflict, party responses, citizens’ preferences and other supply and demand side elements. The four countries compared – Germany, Poland, Switzerland and the United Kingdom – afford rich diversity and offer broad empirical material available for cross-country analyses. Featuring interdisciplinary research, this book draws together recent developments in the evolution of European integration differentiation – its dynamics and determinants. This monograph will be of key interest to scholars and students of European integration, comparative politics, political psychology, international relations, and more broadly to European (area) studies. Chapter 5 of this book is freely available as a downloadable Open Access PDF at http://www.taylorfrancis.com under a Creative Commons Attribution-Non-Commercial (CC-BY-NC) 4.0 license.