This Handbook, produced by the UNU-CPR for the President of the General Assembly at its 78th session, responds to the General Assembly's request and is designed as a resource for Member States and other stakeholders. It offers a review of the past practice of the General Assembly addressing issues of international peace and security, case studies of some of the most important examples of General Assembly action, and recommendations on how Member States could foster deeper interaction with the SC in the future. The Handbook provides an impartial, user-friendly guide for Member States looking to energize the work of the General Assembly. It contains three main parts: (I) a brief overview of the Charter-based roles and responsibilities of the General Assembly, including the divisions of responsibilities between the Assembly and the Security Council and developments in practice; (II) five chapters summarizing past General Assembly practice with regard to key issue areas (peace operations, use of force, sanctions, accountability mechanisms and good offices); and (III) key lessons to help foster interaction and synergies between the GA and the SC on issues of international peace and security. A series of annexes provide abbreviated case studies to supplement the discussion of key practice areas --[author website].