"A study of their interactions and interrelations, with special consideration of the 1969 Vienna Convention on the Law of Treaties."--T.p.

States often regard themselves bound by treaty rules which have developed under customary international law, even though many of the treaties themselves have not been ratified. The Law of the Sea Convention, for instance, has generated new customary rules which modified the 1958 Geneva Conventions. These & many other issues are dealt with clearly & systematically in this informative handbook on the relations between written & unwritten international law. The conclusions of the first edition of Customary International Law & Treaties were largely confirmed by the International Court of Justice in the Nicaragua Case. This fully revised second edition, while basing itself on the original version, brings the subject up to date.

Customary international law remains a central source of international law and the core of the international legal system. It continues to draw the attention of lawyers, especially at a time marked by the great expansion of international law and its increasing application in domestic and international courts. Determining whether an applicable rule of customary international law exists is therefore of great practical concern - but this important legal task is not always simple or straightforward. This book serves as guidance to those seeking to determine the existence of rules of customary international law and their content. It elaborates on the methodology for the identification of rules of customary international law and examines a host of questions concerning the process and evidence at issue. It does so by complementing the authoritative work of the UN International Law Commission on this topic, and by drawing upon a wealth of additional practice and writings. Identification of Customary International Law provides an overview of the Commission's work and expands on it by addressing the nature and history of custom as a source of international law, inquiring into each of the two constituent elements of customary international law (namely, a general practice and opinio juris), explaining the value and limits of certain forms of evidence, and throwing further light on such issues as the persistent objector rule and particular customary international law. Practitioners and scholars alike will find this detailed treatment useful in seeking to determine the existence and content of any customary rule and in ensuring that arguments about customary international law are persuasive.

Whether or not a certain norm is legally binding upon international actors may often depend on whether or not the instrument which contains the norm is to be regarded as a treaty. In this study, the author argues that instruments which contain commitments are, "ex" "hypothesi," treaties. In doing so, he challenges popular notions proclaiming the existence of morally and politically binding agreements and so-called soft law'. Such notions, Klabbers argues, are internally inconsistent and founded upon untenable presumptions. Moreover, they find little support in the pertinent decisions of municipal and international courts and tribunals. The book addresses issues of importance not only for academics working in international law, constitutional law and political science, but also for practitioners involved in the making, implementation and enforcement of international agreements.

Patrick Dumberry provides a comprehensive analysis of the rules of customary international law in the field of international investment law.

Provides an intro. to the roles that international law and agreements play in the U.S. International law is derived from two primary sources ¿ international agreements (IA) and customary practice. Under the U.S. legal system, IA can be entered into by means of a treaty or an executive agreement. The Constitution allocates primary responsibility for entering into such agreements to the exec. branch, but Congress also plays an essential role. Contents of this report: (1) Intro.; (2) Forms of IA: Treaties; Executive Agreements; Nonlegal Agreements; (3) Effects of IA on U.S. Law; (4) Customary International Law; (5) Reference to Foreign Law by U.S. Courts. This is a print on demand edition of an important, hard-to-find report.

This book is a thought-provoking and authoritative text on this fast moving field of international law.

Along with treaties, custom is one of the sources of international law. It is known to consist of two elements: state practice and opinio juris. While many studies have looked at traditional questions of how to identify customary law, this book takes a new and original approach. It looks instead at the structure of thought that lies beneath the arguments about customary international law. By examining these structures, the book uncovers surprising conclusions, and demonstrates what the author describes as the 'discursive splendour' of customary international law. The book guides the reader through an analysis of eight distinct performances at work in the discourse on customary international law. One of its key claims is that customary international law is not the surviving trace of an ancient law-making mechanism that used to be found in traditional societies. Indeed, as is shown throughout, customary international law is anything but ancient, and there is hardly any doctrine of international law that contains so many of the features of modern thinking. It is also argued that, contrary to mainstream opinion, customary international law is in fact shaped by texts, and originates from a textual environment. This book provides an engaging account of customary international law, whilst challenging readers to rethink their understanding of this fundamental part of the discipline.

In The Rome Statute as Evidence of Customary International Law, Yudan Tan offers a detailed analysis of topical issues concerning the Rome Statute of the International Criminal Court as evidence of customary international law.