5.             The arbitral tribunal shall make arrangements for the translation of oral statements made at a hearing and for a record of the hearing if

a. either is deemed necessary by the tribunal under the circumstances of the case; or

b. the parties have agreed to it and have communicated such agreement to the tribunal at least 30 days before the hearing.

6.             All oral hearings and meetings in arbitral proceedings shall be held in camera.

Article 27

Witnesses

1.             The arbitral tribunal may require a witness to be absent from a hearing during the testimony of another witness.

2.      The arbitral tribunal may determine the manner in which witnesses are to be examined.