This open access book discusses crucial questions concerning the citizenship of the European Union. Is it a new citizenship beyond the nation-state although it is derived from Member State nationality? Who should get it? What rights and duties does it entail? Should EU citizens living in other Member States be able to vote there in national elections? In case there are tensions between free movement and social rights, which should take priority? And should the European Court of Justice determine what European citizenship is about or the legislative institutions of the EU or national parliaments? This collection of working papers provides a wide range of answers to these questions from legal scholars, political scientists, and political practitioners. It is structured as a series of three conversations in which authors respond to each other. This exchange of arguments provides unique depth to the debate.