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.