There is much confusion over the 'Constitution', and this book provides an in-depth legal analysis of the institutional aspects of the Constitutional Treaty which, if ratified by the 25 EU Member States, would govern the European Union. Piris argues that, despite its ratification being rejected by the French and the Netherlands referenda in 2005, the Treaty should not be discarded, as it will inevitably be the point of departure for the future of European integration. He places this analysis in an historical and political context and explains the origin, meanings and legal and political effects of all proposed changes to the present treaties.