As a general rule, arbitration procedure comprises two distinct phases: pleadings and oral discussions.

The pleadings consist in the communication by the respective agents to the members of the Tribunal and the opposite party of cases, counter-cases, and, if necessary, of replies; the parties annex thereto all papers and documents called for in the case. This communication shall be made either directly or through the intermediary of the International Bureau, in the order and within the time fixed by the 'Compromis'.

The time fixed by the 'Compromis' may be extended by mutual agreement by the parties, or by the Tribunal when the latter considers it necessary for the purpose of reaching a just decision.

The discussions consists in the oral development before the Tribunal of the arguments of the parties.