The current system of international law is experiencing profound transformations. Indeed, the simultaneous processes of globalization combined with the disintegration of international systems of governance and law-making pose complex challenges for legal scholarship. The doctrinal response to these challenges has been theorized within two seemingly contradictory discourses in international law: fragmentation and constitutionalisation. This book takes an innovative approach to international law, viewing the processes of the fragmentation and constitutionalisation as being profoundly interconnected and reflective of each other. It brings together a select group of contributors, including both established and emerging scholars and practitioners, in order to explore the ways in which the problems of fragmentation and constitutionalisation are viscerally linked one to the other and thus mutually conditioning and stimulating. The book considers the theory and practice of international law looking at the two phenomena in relation to the various fields of international law such as international criminal law, cultural heritage law and international environmental law.

This dissertation examines the idea of constitutionalisation of international law in light of concerns of fragmentation. It focuses on the dynamic of fragmentation in the international legal system. It shows that arguments about constitutionalism do not represent a remedy to the phenomenon of fragmentation. Consequently, the dissertation advances arguments of integrity of international law. Further, the dissertation examines new developments in constitutionalisation practices that support a normative, teleological approach to constitutionalisation in the international legal system. The dissertation offers insights on both the autonomy of the concept of international constitutionalism and the idea of fragmentation as a universally recognised characteristic of modern international law. It offers recommendations on how to address charges of fragmentation in international law in light of the dominant conception of modern international law.

The book examines one of the most debated issues in current international law: to what extent the international legal system has constitutional features comparable to what we find in national law. This question has become increasingly relevant in a time of globalization, where new international institutions and courts are established to address international issues. Constitutionalization beyond the nation state has for many years been discussed in relation to the European Union. This book asks whether we now see constitutionalization taking place also at the global level. The book investigates what should be characterized as constitutional features of the current international order, in what way the challenges differ from those at the national level and what could be a proper interaction between different international arrangements as well as between the international and national constitutional level. Finally, it sketches the outlines of what a constitutionalized world order could and should imply. The book is a critical appraisal of constitutionalist ideas and of their critique. It argues that the reconstruction of the current evolution of international law as a process of constitutionalization -against a background of, and partly in competition with, the verticalization of substantive law and the deformalization and fragmentation of international law- has some explanatory power, permits new insights and allows for new arguments. The book thus identifies constitutional trends and challenges in establishing international organisational structures, and designs procedures for standard-setting, implementation and judicial functions. This paperback edition features the authors' discussion of this book on the EJIL Talks blog.

This major extension of existing scholarship on the fragmentation of international law utilises the concept of 'regimes' from international law and international relations literature to define functional areas such as human rights or trade law. Responding to existing approaches, which focus on the resolution of conflicting norms between regimes, it contains a variety of critical, sociological and doctrinal perspectives on regime interaction. Leading international law scholars and practitioners reflect on how, in situations of diversity and concurrent activity, such interaction shapes and controls knowledge and norms in often hegemonic ways. The contributors draw on topical examples of interacting regimes, including climate, trade and investment regimes, to argue for new methods of regime interaction. Together, the essays combine approaches from international, transnational and comparative constitutional law to provide important insights into an issue that continues to challenge international legal theory and practice.

This Festschrift is published on the occasion of Gerhard Hafner’s 65th birthday and his retirement as a professor at the University of Vienna. It assembles a great number of renowned friends and colleagues in international law honouring Gerhard Hafner’s outstanding career as scholar, diplomat, legal adviser and arbitrator. The diversity of areas selected for this Festschrift reflects the generalist approach of Gerhard Hafner towards international law. Among the topics on which his contribution was particularly influential are the fragmentation of international law, the law of State immunity and international criminal law, which feature prominently in the Festschrift. Other areas covered are the theory of international law (including sources), basic principles of international law, codification of international law, subjects of international law, international dispute settlement, the law of the sea and international environmental law, human rights and humanitarian law and the law of the European Union.

Fragmentation has been much discussed as a threat to international law as a legal system. This book contends that the fragmentation of international law is far exceeded by its convergence, as international bodies find ways to account for each other and the interactions of emerging sub-fields. Reasserting its role as the 'principal judicial organ of the United Nations', the International Court of Justice has ensured that the centre of international law can and does hold. This process has strengthened a trend towards the reunification of international law. In order to explore this process, this book looks at fragmentation and convergence from the point of view of the centre of the International Court and of the position of other courts and tribunals. Featuring contributions by leading international lawyers from a range of backgrounds, this volume proposes both a new take and the last word on the fragmentation debate in international law--