The Commentary on the Vienna Convention on the Law of Treaties offers an in‑depth, article‑by‑article analysis of all provisions of the Convention. Each provision is examined under the following headings: (I) Purpose and Function of the Article, (II) Historical Background and Negotiating History, (III) Elements of the Article, (IV) Status under Customary International Law, and (V) Treaties Concluded by International Organizations. In sum, the Commentary provides a comprehensive legal analysis of every aspect of the international law of treaties. Moreover, where the law of treaties intersects with other fields of international law—for example, the law of state responsibility and the prohibition of armed aggression—the relevant interfaces are discussed and contextualized. With its strong focus on international practice, the Commentary is an invaluable reference for both scholars and practitioners of international law.

Professor Dr. Oliver Dörr, European Legal Studies Institute, University of Osnabrück, Germany

Professor Dr. Kirsten Schmalenbach, Law Faculty, Paris Lodron University of Salzburg, Austria