1. In the event of an oral hearing, the arbitral tribunal shall give the parties adequate advance notice of the date, time and place thereof.

2. Witnesses, including expert witnesses, may be heard under the conditions and examined in the manner set by the arbitral tribunal.

3. Hearings shall be held in camera unless the parties agree otherwise. The arbitral tribunal may require the retirement of any witness or witnesses, including expert witnesses, during the testimony of such other witnesses, except that a witness, including an expert witness, who is a party to the arbitration shall not, in principle, be asked to retire.

4. The arbitral tribunal may direct that witnesses, i ncluding expert witnesses, be examined through means of telecommunication that do not require their physical presence at the hearing (such as videoconference).