This book contains the proceedings of an international colloquium in honour of Professor Walter van Gerven which was held in Leuven on 15-16 September 2000 and organized by the Universities of Leuven and Maastricht in the framework of the lus Commune Research School. Walter van Gerven has been a professor of Law in Leuven for four decades and in Maastricht between 1994 and 2000; he has been Advocate General at the Court of Justice of the European Communities (1988-1994) and was Member of the Committee of Independent Experts which screened the European Commission in 1999. The book is built around three themes: good governance in the European Union, judicial review of administrative action and liability of supranational, State and private actors. A great number of very distinguished scholars have contributed to this book: Lord Slynn of Hadley, Deirdre Curtin, Christiaan W.A. Timmermans, Gil Carlos Rodriguez Iglesias, Sacha Prechal, Jürgen Schwarze, Takis Tridimas, Bruno de Witte, Jeremy Lever, Pierre Larouche, Francis G. Jacobs, Luc Gyselen, Paul J.G. Kapteyn, Arthur Hartkamp and Pieter VerLoren van Themaat.