The commentary to the Vienna Convention on the Law of Treaties provides an in-depth analysis of each article of article to all provisions of the Vienna Convention. The analysis of each provision consists of (1) the purpose and function of the article; (2) historical background with the date of negotiation, (iii) elements of the article and finally (4) treaties of international organizations. In short, this commentary contains a comprehensive legal analysis of all aspects of international treaty law.

Moreover, when treaty law reaches other areas of international law, for example, the law of State responsibility, the discussion of relevant interfaces and their placement in their context. While focusing on international practice, the commentary is an invaluable reference for both academia and international law practitioners..