Do individual constitutions, and the legal cultures underlying them, pose an obstacle to future EU integration? This ambitious collection brings together reports from all the European Member States, systematically setting out their individual constitutional guarantees. In doing so, it tracks possible roadblocks to the future evolution of European integration. Written by recognised authorities in each Member State, it offers an authoritative and rigorous overview of the European Union's constitutional landscape. Its single-structure approach allows for comparison while maintaining consistency. It will become the standard reference work for academics, students and practitioners in the field of European Union law and integration.