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.

"The Routledge Handbook of Differentiation in the European Union offers an essential collection of ground-breaking chapters reflecting on the causes and consequences of this complex phenomenon. With contributions from key experts in this sub-field 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:

The notion of Differentiated Integration is increasingly used in the literature on European integration. Often employed interchangeably with the notion of "flexible integration, diverging views on its nature have led to the emergence of various definitions and, to some extent, a semantic confusion. A lack of consensus characterizes the academic literature; some authors even avoid putting an explicit definition on the term. The main objective of this book is to seek answers for the following questions: How can one define Differentiated Integration in the European Union? Should Differentiated Integration be considered as a process, a concept, a system or a theory? Should it be seen as a temporary or a well-established phenomenon? How is this field of study likely to develop in the future? In order to do so, all chapters, written by leading experts in the field, offer a state-of-the-art analysis of the study of differentiated integration, from theoretical and practical perspectives. In addition, this book is not a collection of isolated papers: all chapters are interconnected and gravitate towards the aforementioned central questions, but approach these from different perspectives. This book was published as a special issue of the Journal of European Public Policy.

This book offers a comprehensive account and assessment of differentiation in European integration, including an analysis of differentiation in EU enlargement, the Eurozone crisis, Brexit, and the selective integration of non-member states.

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.

This book, adopting a law in context approach, deals with the controversial development of increased differentiation in European Union law.

Differentiation was at first not perceived as a threat to the European project, but rather as a tool to promote further integration. Today, more EU policies than ever are marked by concentric circles of integration and a lack of uniform application. As the EU faces increasingly existential challenges, this timely book considers whether the proliferation of mechanisms of flexibility has contributed to this newly fragile state or whether, to the contrary, differentiation has been fundamental to integration despite the heterogeneity of national interests and priorities.

Comprehensive overview of the Eurozone crisis from a multidimensional constitutional perspective which incorporates the underlying economic assumptions and developments.

The effects of the Eastern enlargement, the biggest so far, are still felt across the European Union (EU). Many warned the EU was about to overreach the limits of its integration capacity. More than a decade later, this book presents a broad-based and systematic evaluation of the 2004–2007’s enlargement and its impact on the EU. In contrast to widespread scepticism, our results show that the EU’s integration capacity has been strong. Credible accession conditionality and pre-accession assistance have had a positive impact on democracy, governance capacity, and economic transformation, at least before accession. After accession, EU institutions have proven resilient. Eastern enlargement has not affected negatively the legislative capacity of the EU. It has not led to a deterioration of compliance and implementation of EU law either; initial differentiated integration has quickly returned to normal levels. This generally positive assessment stands in stark contrast with increasing public opposition to future EU enlargements. We identify some less known sources of such opposition: the lack of communication and political debate about enlargement between EU leaders and their citizens. Public opposition undermines the credibility of EU conditionality, which is crucial for having a positive impact on neighbouring countries in the future. The chapters in this book originally appeared in a special issue in the Journal of European Public Policy.

Far from displaying a uniform pattern, European integration varies significantly across policy areas and individual countries. Why do some member states choose to opt out of specific EU policies? Why are some policies deeply integrated whereas others remain intergovernmental? In this updated second edition, the authors introduce the most important theoretical approaches to European integration and apply these to the trajectories of key EU policy areas. Arguing that no single theory offers a completely convincing explanation of integration and differentiation in the EU, 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.