This book is a direct result of the publication of the 1994 Netherlands Yearbook of International Law, published in 1995. It was decided that the publication of the 25th Yearbook should be marked by a special volume written by current and former members of the Board of Editors, omitting the usual documentation sections. The central theme of this special volume is whether the secondary rules form a potential risk, constituting a threat to the global unity and efficacy of the international legal order. As many fields of international law as possible have been included: diplomatic law, the law of war, human rights, environmental law, and the law of international organizations (e.g. GATT/WTO and the European Communities). The research methods used are presented in an introductory paper, and results and conclusions are provided. The UN legal system is also accorded its rightful place in the research.