The provisions of the 1948 Genocide Convention are now being interpreted in important judgments by the International Court of Justice, the ad hoc Tribunals for the former Yugoslavia and Rwanda, and increasingly in domestic courts. In this definitive work William A. Schabas gives detailed attention to the concept of protected groups, the quantitative dimension of genocide, problems of criminal prosecution, and issues of international judicial cooperations such as extradition. He explores the duty to prevent genocide, and the consequences this may have on the emerging law of humanitarian intervention.