Rule 11
Filling Vacancies on the Tribunal

(1) Except as provided in paragraph (2), a vacancy resulting from the disqualification, death, incapacity or resignation of an arbitrator shall be promptly filled by the same method by which his appointment had been made.

(2) In addition to filling vacancies relating to arbitrators appointed by him, the Chairman of the Administrative Council shall appoint a person from the Panel of Arbitrators:

(a) to fill a vacancy caused by the resignation, without the consent of the Tribunal, of an arbitrator appointed by a party; or

(b) at the request of either party, to fill any other vacancy, if no new appointment is made and accepted within 30 days of the notification of the vacancy by the Secretary-General.

(3) The procedure for filling a vacancy shall be in accordance with Rules 1, 4(4), 4(5), 5 and, mutatis mutandis, 6(2).

Rule 12
Resumption of Proceeding after Filling a Vacancy

As soon as a vacancy on the Tribunal has been filled, the proceeding shall continue from the point it had reached at the time the vacancy occurred. The newly appointed arbitrator may, however, require that the oral procedure be recommenced, if this had already been started.

Chapter II
Working of the Tribunal

Rule 13
Sessions of the Tribunal

(1) The Tribunal shall hold its first session within 60 days after its constitution or such other period as the parties may agree. The dates of that session shall be fixed by the President of the Tribunal after consultation with its members and the Secretary-General. If upon its constitution the Tribunal has no President because the parties have agreed that the President shall be elected by its members, the Secretary-General shall fix the dates of that session. In both cases, the parties shall be consulted as far as possible.

(2) The dates of subsequent sessions shall be determined by the

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