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This open access book brings conceptual clarity to the study and practice of self-determination, showing that it is, without doubt, one of the most important concepts of the international legal order. It argues that the accepted categorisation of international and external self-determination is not helpful, and suggests a new typology. This new framework has four categories: polity-based, identitarian, colonial, and remedial forms. Each will be distinguished by the grounds, or the legitimacy-claim, on which they are based. This not only ensures consistency, it moves the question out of the purely conceptual realm and addresses the practical concerns of those invoking self-determination. By presenting international lawyers with a typology that is both theoretically consistent and more practically useful, the author makes a significant contribution to our understanding of this keystone of international law.