International Law Law

The Practice of Interpretation in International Law, Vol. 4: Unity, Diversity, and Evolution

By Sotirios Ioannis Lekkas et al.
Coming Soon Cambridge University Press Available August 2026

Specifications

ISBN-13
9781009599115
Publisher
Cambridge University Press
Publication
August 2026
Format
Paperback
Jurisdiction
U.K. ? Countri(es) for reference only

Details

Does a unified law of interpretation exist? Can it be applied to all legal rules, regardless of their source, interpreter, or subject matter? This volume offers a comprehensive exploration of how interpretation is practiced across the diverse landscape of international law. Drawing on contributions from leading scholars and practitioners, the book examines interpretation through the lenses of multiple actors, sources, and regimes, revealing three core themes. Unity emerges in shared interpretative methods, rooted in the Vienna Convention on the Law of Treaties and its customary counterparts. Diversity appears in the distinctive approaches found within specialised legal regimes. Evolution is seen in the growing range of materials considered during interpretation. Rich in comparative insights, this volume will be an essential reference for researchers, practitioners, and anyone interested in the dynamic processes that shape meaning in international law.

This title is also available as open access on Cambridge Core.

Table of Contents

1. Shifting landscape of interpretation in international law: sources, actors, subject-matters
Sotirios Ioannis Lekkas, Nina Mileva and Panos Merkouris

Part I. Unity, Diversity, and Evolution of Interpretation Across Sources of International Law:
2. Systemic integrational and public law elements in the sources of international law
Jure Vidmar
3. Comparative reasoning in international investment law and arbitration
Yannick Radi
4. Interpretation of customary international environmental law before international courts
Ilias Plakokefalos

Part II. Unity, Diversity, and Evolution of Interpretation of International Law across Actors:
5. Interpretation of customary international law in an institutional context
Catherine Broelmann
6. Treaty interpretation in the fog of war: the evolution of the ICRC's methodology
Ellen Polcinski
7. Treaty interpretation practices of human rights bodies: thrown for a loop or thrown into the crucible
Marlies Hesselmann
8. Mutually supportive interpretation of the law of the sea, international biodiversity law, and human rights - clarifying the path towards transformative change
Elisa Morgera

Part III. Unity, Diversity, and Evolution of Interpretation across Subject-Matters of International Law:
9. Application of the general rule of interpretation by the WTO dispute settlement system
Gabrielle Marceau, Maria George and Vishakha Raj
10. Methods of interpretation of international investment law: the use of the object and purpose of investment treaties in interpreting territoriality
Thomas Nektarios Papanastasiou
11. Core international crimes at the interface: in search of unity amidst diversity in the interpretation of international criminal law
Olympia Bekou
12. Crimes against humanity and customary international law
Leila Sadat

Concluding Observations:
13. The practice of interpretation in international law: unity, diversity, and evolution
Judge Ineta Ziemele
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