This publication is the result of a symposium held in 2004 at the Kiel Walther Schücking Institute for International Law on the occasion of its 90th anniversary. In 2000 the International Law Commission of the United Nations in its preliminary study on dangers associated with conflicts between various normative subsystems of international law stated that the fragmentation of international law could endanger the stability as well as the consistency of international law and its comprehensive nature. It is against this background that this volume contains an in-depth analysis as to whether divergent trends have emerged, and if so to what extent, with regard to the sources of international law, its subjects, questions of State responsibility and dispute settlement with regard to the law of the sea, international humanitarian and international criminal law, human rights, international environmental law and international economic law. Besides, the book also addresses the question whether, and if so which, rules have developed to cope with conflicts between the various subsystems just mentioned. It therefore constitutes an essential contribution to the ongoing and crucial debate on the fragmentation of modern public international law.

Autorentext
Professor Andreas Zimmermann is Professor of Law, University of Potsdam and Director Potsdam Centre of Human Rights; Dr. jur. (Heidelberg), LL.M. (Harvard); former Member of the German delegation to the Preparatory Committee and the United Nations Diplomatic Conference on the Establishment of an International Criminal Court; member of the Permanent Court of Arbitration; counsel in various cases before the ICJ; judge ad hoc in various cases before the European Court of Human Rights; arbitrator under the annex to the Vienna Convention on the Law of Treaties; member of the advisory board on UN issues of the German Ministry of Foreign Affairs.

Inhalt
Inhalt: J. Delbrück, The Walther Schücking Institute at 90 - R. Hoffmann / A. Zimmermann, Introductory Remarks - D. König, Questionnaire International Law of the Sea - A. Peters / H. W. Kessler, Questionnaire International Humanitarian Law - E. Riedel, Questionnaire Human Rights and the Unity-Diversity Divide - P.-T. Stoll, Questionnaire International Environmental Law - C. Tietje, Questionnaire International Economic Law - M. Heymann, Unity and Diversity with Regard to International Treaty Law - M. Kohen / A. Pellet / J. Bröhmer, Comments - A. Seibert-Fohr, Unity and Diversity in the Formation and Relevance of Customary International Law - V. Gowlland-Debbas / F. L. Morrison / T. Stein, Comments - R. Geiß, Non-State Actors: Their Role and Impact on the Fragmentation of International Law - G. Hafner / J. J. Paust / D. Thürer, Comments - S. Wittich, Domestic Implementation and the Unity of International Law - A. Abou-el-Wafa / E. Benvenisti / Z. Kdzia / C. Tomuschat, Comments - B. Rudolf, Unity and Diversity of International Law in the Settlement of International Disputes - S. Oeter / P. Tomka / R. Wolfrum, Comments - C. J. Tams, Unity and Diversity in the Law of State Responsibility - C. Espósito Massicci / M. Herdegen / B. Simma, Comments - J. Delbrück / D. König / A. Peters / E. Riedel / P.-T. Stoll / C. Tietje, Overall Statements - R. Hofmann, Concluding Remarks