The Maastricht Treaty introduced a number of revolutionary changes to the European Union. This volume brings together a group of leading scholars to reflect on the developments in each of these key areas over the past 20 years, and on this basis to assess the way in which the EU is position to address current challenges.

This book was published as a special issue of the Journal of European Integration.

1. Introduction: Understanding and Assessing the Maastricht Treaty 2. Still Rooted in Maastricht: EU External Relations as a 'Third-generation Hybrid' 3. Justice and Home Affairs: The Treaty of Maastricht as a Decisive Intergovernmental Gate Opener 4. Twenty Years of Co-decision Since Maastricht: Inter- and Intrainstitutional Implications 5. The Maastricht Treaty and the European Council: The History of an Institutional Evolution 6. The Maastricht Treaty at Twenty: A Greco-European Tragedy? 7. 'Maastricht Plus': Managing the Logic of Inherent Imperfections 8. Post-Maastricht Civil Society and Participatory Democracy 9. In the Face of Crisis: Input Legitimacy, Output Legitimacy and the Political Messianism of European Integration 10. The Arc of Institutional Reform in Post-Maastricht Treaty Change

Thomas Christiansen is Jean Monnet Professor of European Institutional Politics at Maastricht University. He is Co-Director of the Maastricht Centre for European Governance (with S.Vanhonacker) and Executive Editor of the Journal of European Integration (with S.Duke). He has published widely on different aspects of the institutional politics of the EU.

Simon Duke is a Professor at the European Institute of Public Administration (EIPA), Maastricht, Netherlands. He has published several monographs and his work has also appeared in numerous academic journals including the Journal of Common Market Studies, International Politics, European Foreign Affairs Review and the Hague Journal of Diplomacy.