Rainer Bauböck is one of the world's leading scholars of citizenship and migration. The theory he outlines in this volume is the culmination of twenty years' work thinking through the relationship of citizenship with multilevel democracy and migration. Bauböck's lead essay offers a clearly structured concept of democratic citizenship. It addresses the major theoretical and practical questions of the forms of citizenship and access to citizenship in different types of polity, the specification and justification of rights of non-citizen immigrants as well as non-resident citizens, and the conditions under which norms governing citizenship can legitimately vary. The essay ranges from consideration of the demos boundary problem to contemporary citizenship regimes, linking literatures that have not been previously drawn together. The second part of the book contains responses to Bauböck's essay from a range of influential interlocutors. The volume concludes with Bauböck's extensive response to his critics. LEAD AUTHOR: Rainer Bauböck is Professor of Social and Political Theory at the European University Institute in Florence, Italy INTERLOCUTORS: Joseph H. Carens, University of Toronto David Miller, Nuffield College, University of Oxford Iseult Honohan, University College Dublin Will Kymlicka and Sue Donaldson, Queen's University at Kingston David Owen, University of Southampton Peter J. Spiro, Temple University