This text is a revised edition and contains new material documenting the extensive and rapid innovations in the UN Security Council's procedures of the past two decades. It provides insight into the inside workings of the world's pre-eminent body for the maintenance of international peace and security. Grounded in the history and politics of the Council, it describes the ways the Council has responded through its working methods to a changing world. It explains the Council's role in its wider UN Charter context and examines its relations with other UN organs and its own subsidiary bodies.