Centered on progressiveness, these essays rigorously address some philosophical, conceptual and structural issues relating to the international legal system, the International Court of Justice (ICJ) and the international criminal tribunals. These include: the concept of the international law of co-progressiveness, opinio juris and customary international law, the rule of law, the interpretation of the ICJ Statute, law and expedience at the ICJ, the relationship between the International Criminal Court and the Security Council, the definition of crimes against humanity, guilty plea fairness,...