12 Subsidiary Bodies and Sub-Committees 5. The Peace and Security Council may establish such subsidiary bodies as it deems necessary for the performance of its functions. Such subsidiary bodies may include ad hoc committees for mediation, conciliation or enquiry, consisting of an individual State or group of States. The Peace and Security Council shall also seek such military, legal and other forms of expertise as it may require for the performance of its functions. Chairmanship 6. The chair of the Peace and Security Council shall be held in turn by the Members of the Peace and Security Council in the alphabetical order of their names. Each Chairperson shall hold office for one calendar month. Agenda 7. The provisional agenda of the Peace and Security Council shall be determined by the Chairperson of the Peace and Security Council on the basis of proposals submitted by the Chairperson of the Commission and Member States. The inclusion of any item in the provisional agenda may not be opposed by a Member State. Quorum 8. The number of Members required to constitute a quorum shall be two- thirds of the total membership of the Peace and Security Council. Conduct of Business 9. The Peace and Security Council shall hold closed meetings. Any Member of the Peace and Security Council which is party to a conflict or a situation under consideration by the Peace and Security Council shall not participate either in the discussion or in the decision making process relating to that conflict or situation. Such Member shall be invited to present its case to the Peace and Security Council as appropriate, and shall, thereafter, withdraw from the proceedings.