United Nations Staff Selection System  The United Nations Secretariat, in April 2010, pursuant to Secretary-General's bulletin ST/SGB/2002/5, promulgated United Nations Staff Selection System administrative instruction (ST/AI 2010/3) dated 22 April 2010. Administrative instruction ST/AI 2010/3 supersedes and abolishes the administrative instructions titled "Staff selection system" (ST/AI/ 2006/3/Rev.1), "Technical cooperation personnel and OPAS officers" (ST/AI/297 and Add.1), and "Movement of staff from the Field Service category to the Professional category" (ST/AI/360/Rev.1 and Corr.1). The new administrative instruction will remain in effect "until specifically amended or abolished". ST/AI 2010/3 applies to all appointments up to the D-2 level that have contracts of 1 year or longer. It excludes appointments at the Assistant Secretary-General and Under-Secretary-General levels, temporary appointments, and appointment of staff selected through a competitive examination. The intent of the new system is to integrate "recruitment, placement, promotion and mobility of staff within the Secretariat" up to and including D-1 and equivalent posts. The new system introduces a new requirement of periodic 'mobility' for promotion for "Staff in the Professional and above categories, up to and including those at the D-2 level". In the hierarchy of UN laws, ST/Secretary-General bulletins (ST/SGB) are higher than ST/AI. ST/SGB are bulletins that promulgate "Regulations adopted by the General Assembly, establish Financial Rules, Staff Rules and the organizational structure of the Secretariat and contain important decisions of policy. They are issued by the Secretary-General and remain in effect from a given date until specifically amended or abolished". The ST/AI series are administrative instructions that implement ST/SGB. These "prescribe instructions and procedures ... and set forth office practices and procedures to be applied in more than one department of the Secretariat. These instructions remain in effect from a given date until specifically amended or abolished". Affirmative measures to achieve gender equality in the UN system are contained in administrative instruction ST/AI/1999/9, "Special Measures for the Achievement of Gender Equality". This remains in force, and is listed under the heading Appointments, placement and promotion in the Annual Index to Administrative Issuance along with the administrative instruction on the Staff Selection System (ST/AI/2010/3).