In recent years there has been a flourishing body of work on the Law of Treaties, crucial for all fields within international law. However, scholarship on modern treaty law falls into two distinct strands which have not previously been effectively synthesized. One concerns the investigation of concepts which are fundamental to or inherent in the law of treaties generally - such as consent, object and purpose, breach of obligation and provisional application - while the other focuses upon the application of treaties and of treaty law in particular substantive (e.g. human rights, international humanitarian law, investment protection, environmental regulation) or institutional contexts (including the Security Council, the World Health Organization, the International Labour Organization and the World Trade Organization). This volume represents the culmination of a series of collaborative explorations by leading experts into the operation, development and effectiveness of the modern law of treaties, as viewed through these contrasting perspectives.

Examining the fulfilment of international obligations by subjects of this law, this book explores the normative and functional links between the sources and rules of international law on the one hand, and the responsibility for violating international law on the other. In the sphere of law-making, the theory of obligations allows for a more precise and considered formulation of international obligations. It has the potential to enable subjects of international law to behave more rationally, allowing deeper reflection on whether to take on obligations and how to properly perform them. This book proposes a new approach to the issue of the proper operation of international law, with the theory of obligations at its heart. Linking the institutions and concepts of international law into a rational whole, the book offers an analysis of the operation of international law and the behaviour of its subjects to develop a framework for ensuring the ultimate effectiveness of international law. Analysing sources of law including treaties and common law, alongside the resolutions of international organisations, this book demonstrates the practical application of the subject with reference to the jurisprudence of international courts and other bodies. The volume will be of interest to scholars, students, and practitioners concerned with international law – its creation, performance, application, compliance, and enforcement.

The editors’ substantive introduction and the specially commissioned chapters in the Handbook explore the emergence of transnational labour law as a field, along with its contested contours. The expansion of traditional legal methods, such as treaties, is juxtaposed with the proliferation of contemporary alternatives such as indicators, framework agreements and consumer-led initiatives. Key international and regional institutions are studied for their coverage of such classic topics as freedom of association, equality, and sectoral labour standard-setting, as well as for the space they provide for dialogue. The volume underscores transnational labour law’s capacity to build bridges, including on migration, climate change and development.