At the end of the 20th century and the beginning of the 21st, a new generation of 'internationalized' criminal justice bodies emerged to prosecute suspects of international crimes such as genocide, crimes against humanity and war crimes. Designed to address the weaknesses of both international and domestic criminal courts, these courts combine national and international elements. Their bench consists of both international and national judges and they can apply both international and national law. This book addresses three active and one putative jurisdiction of this kind: the Serious Crimes Panels in the District Court of Dili (East Timor); the 'Regulation 64' Panels in the courts of Kosovo; the Special Court for Sierra Leone; and the so-called Extraordinary Chambers in the Courts of Cambodia. Contributions from scholars of international law and international criminal law and from practitioners working in these courts provide in-depth analysis of the differing approaches and procedures of the courts and evaluation of their wider impact on the development of international criminal law and practice.