Article 38 of the Statute of the International Court of Justice defines "international law" to include not only "custom" and "convention" between States but also "the general principles of law recognized by civilized nations" within their municipal legal systems. In 1953, Bin Cheng wrote his seminal book on general principles, identifying core legal principles common to various domestic legal systems across the globe. This monograph summarizes and analyzes the general principles of law and norms of international due process, with a particular focus on developments since Cheng's writing. The aim is to collect and distill these principles and norms in a single volume as a practical resource for international law jurists, advocates, and scholars. The information contained in this book holds considerable importance given the growth of inter-state intercourse resulting in the increased use of general principles over the past 60 years. General principles can serve as rules of decision, whether in interpreting a treaty or contract, determining causation, or ascertaining unjust enrichment. They also include a core set of procedural requirements that should be followed in any adjudicative system, such as the right to impartiality and the prohibition on fraud. Although the general principles are, by definition, basic and even rudimentary, they hold vital importance for the rule of law in international relations. They are meant not to define a rule of law, but rather the rule of law.

This book examines the role played by domestic and international judges in the “flexibilization” of legal systems through general principles. It features revised papers that were presented at the Annual Conference of the European-American Consortium for Legal Education, held at the University of Parma, Italy, May 2014. This volume is organized in four sections, where the topic is mainly explored from a comparative perspective, and includes case studies. The first section covers theoretical issues. It offers an analysis of principles in shaping Dworkin’s theories about international law, a reflection on the role of procedural principles in defining the role of the judiciary, a view on the role of general principles in transnational judicial communication, a study on the recognition of international law from formal criteria to substantive principles, and an inquiry from the viewpoint of neo-constitutionalism. The second section contains studies on the role of general principles in selected legal systems, including International Law, European Union Law as well as Common Law systems. The third section features an analysis of select legal principles in a comparative perspective, with a particular focus on the comparison between European and American experiences. The fourth and last section explores selected principles in given areas of law, including the misuse of the lex specialis principle in the relationship between international human rights law and international humanitarian law, the role of the judiciary in Poland as regards discrimination for sexual orientation, and the impact of the ECtHR case law on Italian criminal law with regard to the principle of legality. Overall, the book offers readers a thoughtful reflection on how the interpretation, application, and development of general principles of law by the judiciary contribute to the evolution of legal systems at both the domestic and international levels as well as further their reciprocal interactions.

International lawyers usually disregard the vital functions that general principles of law may play in the decisions of international courts and tribunals. As far as international criminal law is concerned, general principles of law may be crucial to the outcome of an international trial, inter alia because the conviction of an accused in respect of a particular charge may depend on the existence of a given defence under this source. This volume examines the role that general principles of law have played in the decisions of international criminal courts and tribunals. In particular, it analyses their alleged ‘subsidiary’ nature, their process of determination, and their transposition from national legal systems into international law. It concludes that general principles of law have played a significant role in the decisions of international criminal courts and tribunals, not only by filling legal gaps, but also by being a fundamental means for the interpretation of legal rules and the enhancement of legal reasoning.

General Principles and the Coherence of International Law offers a comprehensive analysis of general principles of law, assessing their role in guaranteeing the coherence of the international legal system.

In General Principles for Business and Human Rights in International Law Ludovica Chiussi Curzi offers a critical analysis of the relevance of general principles of law in the multifaceted business and human rights field.

Because of its unique nature, the sources of international law are not always easy to identify and interpret. This book provides an ideal introduction to these sources for anyone needing to better understand where international law comes from. As well as looking at treaties and custom, the book will look at more modern and controversial sources.