(1) The Tribunal shall be constituted without delay after registration of the Request.
(2) Unless the parties agree otherwise:
a)
the majority of the arbitrators on a Tribunal shall be nationals of States other than the State party to the dispute, any constituent State of the REIO party to the dispute and the State whose national is a party to the dispute;
b)
a party may not appoint an arbitrator who is a national of the State party to the dispute, any constituent State of the REIO party to the dispute or the State whose national is a party to the dispute;
c)
arbitrators appointed by the Secretary-General shall not be nationals of the State party to the dispute, a constituent State of the REIO party to the dispute or the State whose national is a party to the dispute; and
d)
no person previously involved in the resolution of the dispute as a conciliator, judge, mediator or in a similar capacity may be appointed as an arbitrator.
(3) The composition of a Tribunal shall remain unchanged after it has been constituted, except as provided in Chapter V.