the members of the Committee, and thereafter the Committee shall be convened by its Chairman whenever necessary, at least once a year. ARTICLE 38: BUREAU 1. The Committee shall establish its own Rules of Procedure. 2. The Committee shall elect its officers for a period of two years. 3. Seven Committee members shall form the quorum. 4. In case of an equality of votes, the Chairman shall have a casting vote. 5. The working languages of the Committee shall be the official languages of the OAU. ARTICLE 39: VACANCY If a member of the Committee vacates his office for any reason other than the normal expiration of a term, the State which nominated that member shall appoint another member from among its nationals to serve for the remainder of the term - subject to the approval of the Assembly. ARTICLE 40: SECRETARIAT The Secretary-General of the Organization of African Unity shall appoint a Secretary for the Committee. ARTICLE 41: PRIVILEGES AND IMMUNITIES In discharging their duties, members of the Committee shall enjoy the privileges and immunities provided for in the General Convention on the Privileges and Immunities of the Organization of African Unity. CHAPTER THREE: MANDATE AND PROCEDURE OF THE COMMITTEE ARTICLE 42: MANDATE