10.1.3 in all other cases, hear the parties on the most expeditious or least costly procedure to be adopted for the further conduct of the arbitration, and thereafter rule upon such procedure and upon time limits for complying with such procedure;

10.1.4 thereafter, in such manner as he deems appropriate, on the application of a party or mero motu, conduct hearings or otherwise deal with any further procedural and interlocutory matters, including matters relating to compliance or non-compliance with his procedural rulings;

10.1.5 proceed with the hearing until the final conclusion thereof;

10.1.6 thereafter make a written award on all issues in the dispute, including an award on costs;

10.1.7 notwithstanding anything provided in 10.1.1 to 10.1.6, combine or dispense with any of the steps provided in 10.1.1 to 10.1.6 if he considers it appropriate for the just, expeditious, economical and final determination of all the disputes raised in the proceedings.

10.2 10.2.1 Before devoting any time to any step in the proceedings, the arbitrator shall notify the Secretariat of the nature of such step and of the time which he estimates will be required therefor. The arbitrator shall give a similar notification to the Secretariat before further proceeding with any step which will take more time than he estimated before commencing such step.