Article 30
1. A request for the formation of a special chamber to deal with a particular dispute, as provided for in article 15, paragraph 2, of the Statute, shall be made within two months from the date of the institution of proceedings. Upon receipt of a request made by one party, the President of the Tribunal shall ascertain whether the other party assents. 2. When the parties have agreed, the President of the Tribunal shall ascertain their views regarding the composition of the chamber and shall report to the Tribunal accordingly. 3. The Tribunal shall determine, with the approval of the parties, the Members who are to constitute the chamber. The same procedure shall be followed in filling any vacancy. The Tribunal shall also determine the quorum for meetings of the chamber. 4. Members of a chamber formed under this article who have been replaced, in accordance with article 5 of the Statute, following the expiration of their terms of office, shall continue to sit in all phases of the case, whatever the stage it has then reached.
Article 31
1. If a chamber when formed includes the President of the Tribunal, the President shall preside over the chamber. If it does not include the President but includes the Vice-President, the Vice-President shall preside. In any other event, the chamber shall elect its own President by secret ballot and by a majority of votes of its members. The member who, under this paragraph, presides over the chamber at the time of its formation shall continue to preside so long as he remains a member of that chamber. 2. Subject to paragraph 3, the President of a chamber shall exercise, in relation to cases being dealt with by that chamber and from the time it begins dealing with the case, the functions of the President of the Tribunal in relation to cases before the Tribunal. 3. The President of the Tribunal shall take such steps as may be necessary to give effect to article 17, paragraph 4, of the Statute. 4. If the President of a chamber is prevented from sitting or acting as President of the chamber, the functions of the presidency of the chamber shall be assumed by the member of the chamber who is the senior in precedence and able to act.