This is the first ever textbook on international criminal law published after the adoption of the Rome Statute of the International Criminal Court in July 1998 and the adoption in June 2000 of the Elements of Crimes under the Statute and the Court's Rules of Procedure and Evidence. The book systematically analyses international criminal law in light of the latest developments, including the jurisprudence of the International Criminal Tribunal for the Former Yugoslavia and that for Rwanda. It is divided into four parts. Part I introduces the legal foundations of international criminal law. Part II analyses the substantive law of genocide, crimes against humanity, war crimes, and aggression and other international crimes. Part III deals with modes of perpetration of international crimes and grounds for excluding international criminal responsibility. Part IV elaborates practical procedural and other issues pertaining to the implementation of international criminal justice before international criminal tribunals. This compact, stand-alone textbook covering both the substantive and procedural aspects of international criminal law and containing much of the most recent relevant case law, provides the ideal introduction to this burgeoning field.