The Oxford ILDC online database, an online collection of domestic court decisions which apply international law, has been providing scholars with insights for many years. This ILDC Casebook is the perfect companion, introducing key court decisions with brief introductory and connecting texts. An ideal text for practitioners, judged, government officials, as well as for students on international law courses, the ILDC Casebook explains the theories and doctrines underlying the use by domestic courts of international law, and illustrates the key importance of domestic courts in the development of international law. The Oxford ILDC online database, an online collection of domestic court decisions which apply international law, has been providing scholars with insights for many years.This ILDC Casebook is the perfect companion, introducing key court decisions with brief introductory and connecting texts. André Nollkaemper is Professor of Public International Law at the Faculty of Law of the University of Amsterdam. He is an external Legal Advisor to the Minister of Foreign Affairs of the Netherlands, member of the Permanent Court of Arbitration, of the Institut de Droit International, former President of the European Society of International Law and member of the Royal Netherlands Academy of Arts and Sciences. August Reinisch is Professor of International and European Law at the University of Vienna. He is a member of the International Law Commission, of the Institut de Droit international, and of the Permanent Court of Arbitration, as well as President of the German Society of International Law. Ralph Janik is a Lecturer at the University of Vienna and Webster University. He specializes in international law and international relations. Florentina Simlinger is an Assistant at the Section for International Law and International Relations at the University of Vienna where she focuses on international arbitration and climate change law.