Disarmament is integral to the safeguarding and promotion of security, development, and human rights. Hundreds of millions of dollars are spent each year on disarmament operations, yet no comprehensive guide exists to explain clearly the international rules governing disarmament. This book seeks to fill that gap. It describes the international legal rules that govern disarmament and the operational, political, and technical considerations that govern their implementation. This book aims to support compliance, implementation, and further development of international disarmament law. Traditionally, disarmament focused on weapons of mass destruction. This remains a critically important area of work. In recent decades, the scope of disarmament has broadened to encompass also conventional weapons, including through the adoption of rules and regulations to govern arms transfers and measures to eliminate specific munitions from stockpiles and to destroy explosive remnants of war.