(a) The Tribunal shall consist of such number of arbitrators as has been agreed by the parties.
(b) Where the parties have not agreed on the number of arbitrators, the Tribunal shall consist of a sole arbitrator, except where the Center in its discretion determines that, in view of all the circumstances of the case, a Tribunal composed of three members is appropriate.
(c) Any nomination of an arbitrator made by the parties pursuant to Articles 16, 17 and 18 shall be confirmed by the Center provided that the requirements of Articles 22 and 23 have been met. The appointment shall be effective upon the Center’s notification to the parties.
Appointment Pursuant to Procedure Agreed Upon by the Parties