1. Introduction 2. What is Proportionality? 3. Proportionality: A Multiplicity of Meanings 4. Proportionality in the Just War Tradition 5. Proportionality in International Humanitarian Law 6. Proportionality in Human Rights Law and Morality 7. The Uniqueness of Jus in Bello Proportionality 8. Countermeasures and Counterinsurgency 9. Human Shields and Risk 10. Targeted Killings and Proportionality in Law: Two Models 11. The Nature of War and the Idea of "Cyberwar" 12. Thresholds of Jus in Bello Proportionality Bibliography Index.

The principle of proportionality is one of the cornerstones of International Humanitarian Law. Almost all states involved in armed conflicts recognize that it is prohibited to launch an attack that is expected to cause incidental harm to civilians that exceeds the direct military advantage anticipated from the attack. This prohibition is included in military manuals, taught in professional courses, & accepted as almost axiomatic. Yet, the exact meaning of this principle is vague. Almost every issue is in dispute. Controversy is especially rife regarding asymmetrical conflicts, in which many modern democracies are involved. How exactly should proportionality be implemented when the enemy is not an army, but a non-state actor embedded within a civilian population? What does it mean to use precautions in attack, when almost every attack is directed at objects that are used for both military & civilian purposes?

In this edited volume, scholars from a wide range of areas of international law consider whose interests are at stake in the application of the principle of proportionality. In so doing, the volume casts new light this important principle.

Necessity and proportionality hold a firm place in the international law governing the use of force by states, as well as in the law of armed conflict. However, the precise contours of these two requirements are uncertain and controversial. The aim of Necessity and Proportionality in International Peace and Security Law is to explore how necessity and proportionality manifest themselves in the modern world under the law governing the use of force and the law of armed conflict, and how they relate to each other. The book explores the ways in which necessity and proportionality are applied in practice and addresses pressing legal issues in the law on the use of force, including the controversial "unwilling and unable" test for the use of force in self-defense, drones and targeted killing, the application of this legal regime during civil war, and the need for further transparency in states' justification for the use of force in self-defense. The analysis of the role of military necessity within the law of armed conflict on the modern battlefield focuses on the history and nature of the principle of military necessity, the proper application of the principle of proportionality, how commanders should account for mental harm in calculating proportionality, and the role artificial intelligence and autonomous weapons systems may play in proportionality analysis. The book concludes with a discussion of the potential role of proportionality in the law governing post-conflict contexts.

There has been considerable debate in the international community as to the legality of the forceful actions in Kosovo in 1999, Afghanistan in 2002 and Iraq in 2003 under the United Nations Charter. There has been consensus, however, that the use of force in all these situations had to be both proportional and necessary. Against the background of these recent armed conflicts, this 2004 book offers the first comprehensive assessment of the twin requirements of proportionality and necessity as legal restraints on the forceful actions of States. It also provides a much-needed examination of the relationship between proportionality in the law on the use of force and international humanitarian law.

This book seeks to clarify the legal concept of proportionality in international humanitarian law, as it applies during armed conflict. It is argued in the book that a refocus of the interpretation of the proportionality rule is warranted to enhance the protection of civilians. More precisely, this book seeks to dissect the origins of the rule, determine how its components must be interpreted and how it is to be applied in practice. The book considers practical situations that may arise in the conduct of military operations and searches for the limits international humanitarian law sets to commanders' assessments of proportionality during armed conflict. The book concludes that proportionality is an inherently subjective and imprecise yardstick that nonetheless serves to protect civilians during armed conflict.

Het onderwerp van dit proefschrift is het beginsel van proportionaliteit binnen het humanitair oorlogsrecht (HOR).

The right of States to use force extraterritorially is conditioned by requirements of necessity and proportionality. This book provides a much-needed detailed analysis of those requirements, and a coherent and up-to-date account of the applicable contemporary international law in this field.

The ECJ has applied fundamental rights and the principle of proportionality for decades. This book tries to elucidate the Court's approach to these fundamental tenets of Community law. It starts with establishing a firm theoretical foundation. Then, the book analyzes the case law of the ECJ and other constitutional courts to find out which method courts actually apply. Next, it is discussed why the courts follow a particular approach. Then, it is considered whether the approach fulfils constitutional requirements. Finally, a rationalizing model of balancing is developed. The book is useful for the practitioner as well as for the researcher. It does not present a mere summary of the Court's case law but a systematization of the underlying rationales.

The main objective of this study is to present a comparative legal analysis of proportionality. It provides a close examination of the key areas in which this principle has been applied, both at the national and supranational levels. The whole work is placed in the context of transformation of public law in the twentieth century. As many important general principles of law as applied by the Court of Justice have been borrowed from German and French law, a comparative study of the various forms which this principle has assumed in both German and French public law is presented. The book then offers an in-depth analysis of the application and impact of the principle of proportionality in EC law. The introduction and development of this principle by the Court of Justice represents one of the most striking examples of the interaction between the Community and national legal systems. It also illustrates the character of Community law as developed by the Court and the law-making function of the latter.