The principle of the self-determination of peoples is enshrined in the Unit
ed Nations Charter and based on liberal and democratic values. However, the
international community has, until recently, interpreted this principle ve
ry restrictively, so that it has amounted to little more than the right to
be free from European colonialism. The collapse of the USSR and Yugoslavia,
as well as persistent ethno-nationalist conflicts around the world, have p
rovoked new thinking about the right of self-determination in political the
ory. This article reviews six theories, and identifies what they have in co
mmon and on what they differ. It draws some cautious policy conclusions fro
m this analysis and, in doing so, seeks to clarify the role and limits of t
heory in international politics.