LEENDERT J. BAL Transport Attaché at the Netherlands Permanent Representation at the European Union in Brussels, Belgium DEREK BEACH University of Aarhus, Denmark OLEG ELGSTRÖM Professor of Political Science at Lund University, Sweden PETER C. J. VAN GRINSVEN Netherlands Institute of International Relations "Clingendael" ALAIN GUGGENBÜHL European Institute of Public Administration, The Netherlands DOROTHEE HEISENBERG Johns Hopkins School of Advanced International Studies in Washington, DC, USA MENDELTJE VAN KEULEN Netherlands Institute for International Affairs,The Netherlands ALICE LANDAU University of Geneva, Switzerland PIETER J. LANGENBERG Netherlands Permanent Mission to the European Union, The Netherlands RINUS VAN SCHENDELEN Erasmus University, Rotterdam, The Netherlands.