The United Nations Handbook is published by the New Zealand Government as a ready reference guide. It provides current information about all the UN family organizations, including their purpose, evolution, structure and membership, where applicable. It is not intended to be a historical record. The book has at its heart information about the six principal UN organs established by the UN Charter: the General Assembly, Security Council, Economic and Social Council, Trusteeship Council, International Court of Justice and the Secretariat. It also contains information about subsidiary organs established in accordance with the Charter, related UN organs and programmes, specialized agencies and autonomous bodies related to the UN, and various ad hoc organs and programmes. Some bodies are shown as subsidiary to or associated with one or other of the principal organs, while others are shown under the heading Other Bodies Subsidiary or Related to the UN. The specialized agencies of the UN are included under this heading.