The United Nations Secretariat is one of the six major organs of the United Nations (a) the General Assembly; (b) the Security Council; (c) the Economic and Social Council; (d) the defunct Trusteeship Council; and (e) the International Court of Justice. The Secretariat is the United Nations' executive arm. The Secretariat has an important role in setting the agenda for the UN's deliberative and decision making bodies of the UN (the General Assembly, Economic and Social Council, and Security Council), and the implementation of the decision of these bodies. Secretary-General, who is appointed by the General Assembly, is the head of the secretariat.