(12) The Commission may examine the parties and their witnesses when hearing a dispute. (13) A witness called and examined by the either party may be cross-examined by the other party and after being cross-examined, the witness may be re-examined. (14) The Commission may, at any time before making any orders relating to a dispute, require a party or any other person whom the Commission considers competent, to adduce documentary evidence or produce any material, specimen or product that the Commission may consider necessary for the determination of a dispute. (15) The Commission may adjourn the hearing of a dispute for the production of further evidence or for other good cause, on such terms as it may determine. (16) Where on the date of hearing any of the parties or their authorized representative does not appear when the dispute is called for hearing, the Commission may dismiss the dispute for non-appearance or proceed ex parte. (17) Where a dispute is dismissed in default or decided ex-parte an aggrieved party may file an application within fourteen days from the date of such dismissal, for review of the order given, and the Commission may review the order if it is satisfied that there was sufficient cause for the non-appearance. (18) No party to a dispute shall communicate, outside the hearing of the matter, with any member of the Commission with regard to matters or issues which are the subject matter of the dispute. 8. Decision of the Commission. (1) The Commission shall make its decision in writing, stating reasons for the decision, within thirty days from the date of conclusion of the hearing. (2) The decision of the Commission shall be dated and signed by the members of the Commission who participated in the hearing and determination of the dispute. (3) The Commission shall cause to be made a record of the proceedings of the hearing of the dispute and include that record, together with a copy of the decision, in a document to be certified and signed by the presiding officer of the