The pronouncements of punishment for war crimes, crimes against humanity, and genocide by the International Criminal Tribunal for the former Yugoslavia (ICTY) will be among its most important legacies for international law and international relations. The purpose of our research is to examine the judges' opinions on the determinants of punishment and, most especially, the data on sentences handed down by the trial chambers in order to understand which factors are the most powerful in explaining sentences. We find that there is a fair degree of consistency in the sentences conferred on the guilty. By systematically examining all the sentences both doctrinally and empirically we can see that sentences are premised on those critical factors that the judges are admonished to employ by the ICTY Statute and their own Rules of Procedure and Evidence.