The law of international responsiblity serves two main goals: providing reparation of individual states (or other victims) and the preservation of public order. Traditionally it has been held that despite these quite different aims, the law of of international responsibility is of a unitary nature, consisting of a single set of principles that applies to all breaches of all rules of international law. The article argues that in present international law thus unity cannot be maintained. On the one hand there is need for more refined principles of reparation and compensation. On the other hand there is a need for better accountability principles. Just as domestic law does not treat tort law and constitutional or administrative law under one set principles, international responsiblity must be more differentiated if it wishes to remain relevant in the 21st century.