The Office of the Special Adviser to the Secretary-General on Gender Issues and Advancement of Women (OSAGI) used to operate under DESA, but is now a part of the UN Women. Created in 1997 the office is charged with monitoring the implementation of the Millennium Declaration, the Beijing Declaration and the Platform for Action of the Fourth World Conference on Women (FWCW) held in Beijing in 1995 and the Outcome Document of the special session of the General Assembly on Beijing+5. OSAGI primarily focuses on the development of gender mainstreaming within the United Nations system and representation of gender concerns on international platforms. 
OSAGI’s mandate was to facilitate the work of Security Council on the agenda of Women, Peace and security. The head of OSAGI; Special Adviser on Gender Issues and Advancement of Women was appointed by the Secretary-General. The Special Adviser had leadership for the Inter-Agency Network on Women and Gender Equality and the Inter-Agency Task Force on Women, Peace and Security, a mandate delegated by the Security Council under resolution 1325 (see IANWGE).  Operationally, OSAGI had a very small office and capacity at UN Headquaters.