This book is a guide to the law that applies in the three international criminal tribunals, for the former Yugoslavia, Rwanda and Sierra Leone, set up by the UN during the period 1993 to 2002 to deal with atrocities and human rights abuses committed during conflict in those countries. Building on the work of an earlier generation of war crimes courts, these tribunals have developed a sophisticated body of law concerning the elements of the three international crimes , and forms of participation in such crimes, as well as other general principles of international criminal law, procedural matters and sentencing.