Requests the Secretary-General as well as the executive heads of all organizations within the United Nations system to take all necessary measures in order to ensure, in accordance with the Charter of the United Nations, bearing in mind in particular Article 101, paragraph 3, of the Charter, that an equitable balance between men and women staff members, particularly in the positions described above, be achieved before the end of the Second United Nations Development Deca_de at all levels in the United Nations system;