(3) The notice shall be accompanied by five additional signed copies and by the fee prescribed by Article 5 of the Administrative and Financial Rules (Additional Facility).

Article 4
Registration of the Notice

As soon as the Secretary-General shall have satisfied himself that the notice conforms in form and substance to the provisions of Article 3 of these Rules, he shall register the notice in the Arbitration (Additional Facility) Register and on the same day dispatch to the parties a certificate of registration. He shall also transmit a copy of the notice and of the accompanying documentation (if any) to the other party to the dispute (hereinafter called the "Respondent").

Article 5
Certificate of Registration

The certificate of registration of a notice shall:

(a) record that the notice is registered and indicate the date of the registration and of the dispatch of that notice;

(b) notify each party that all communications in connection with the proceeding will be sent to the address stated in the notice, unless another address is indicated to the Secretariat;

(c) unless such information has already been provided, invite the parties to communicate to the Secretary-General any provisions agreed by them regarding the number and the method of appointment of the arbitrators; and

(d) invite the parties to proceed, as soon as possible, to constitute an Arbitral Tribunal in accordance with Chapter III of these Rules.

CHAPTER III
THE TRIBUNAL

Article 6
General Provisions

(1) In the absence of agreement between the parties regarding the number of arbitrators and the method of their appointment, the Tribunal shall consist of three arbitrators, one arbitrator appointed by each party and the third, who shall be the President of the Tribunal, appointed by agreement of the parties, all in accordance with Article 10 of these Rules.

(2) Upon the dispatch of the certificate of registration of the notice for arbitration, the parties shall promptly proceed to constitute a Tribunal.

(3) The Tribunal shall consist of a sole arbitrator or any uneven number of arbitrators appointed as the parties shall agree.

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