This book explores recent contributions of the case-law of international courts and tribunals to the development of international law. It begins by looking at how such case-law has contributed to the development of the methodology of international law and to the development of procedural rules. It further examines recent contributions from three major players in the international judicial arena: the International Court of Justice, the International Tribunal for the Law of the Sea and the mechanisms for Investor-State Dispute Settlement. The contributors are well-established academics and practitioners as well as emerging voices in international law, coming from a rich and diverse regional background.