This article presents a new set of analytical tools for understanding competing conceptions of political membership. Controversies concerning nationality and citizenship are often seen as products of conflict between `civic' and `ethnic' visions. However, the conceptual roots of current discussions and disagreements about political membership are actually more complicated than this might suggest. After examining the dichotomy of civic and ethnic and its limitations, this article identifies five competing ways of understanding the meaning of belonging to, or being a citizen (...) of, a given polity. Political membership may be understood and discussed as a matter of descent from common biological ancestors, cultural attachment, or identification with particular political principles. Alternatively, it may also be imagined either as an exchange of rights for duties or as a benefit granted to those contributing materially to the community. Each of these conceptions figures significantly in current political and intellectual discussions of citizenship and nationality. The typology may also prove applicable to new kinds of debates about global citizenship. (shrink)