For the time being, the political project of basing the European Union on a document entitled 'Constitution' has failed. The second, revised and enlarged edition of this volume retains its title nonetheless. Building on a scholarly rather than black-letter law account, it shows European constitutional law as it looks following the Treaty of Lisbon, with the EU's foundational treaties mandating the exercise of public authority, establishing a hierarchy of norms and legitimising legal acts, providing for citizenship, and granting fundamental rights. In this way the treaties shape the relations between legal orders, between public interest regulation and market economy, and between law and politics. The contributions demonstrate in detail how a constitutional approach furthers understanding of the core issues of EU law, how it offers theoretical and doctrinal insights, and how it adds critical perspective.