The function of the mediator is to assist the parties in reaching a voluntary settlement of the dispute prior to grievance arbitration. A mediator may hold separate or joint conferences for this purpose. An agreement to mediate, however, shall not alter a scheduled arbitration date unless both parties agree to postpone the arbitration. Unless expressly agreed to in writing by the parties, at no time shall a grievance mediator also act as an arbitrator of the same case. A grievance mediator shall not discuss any aspect of the grievance mediation process with the appointed arbitrator.
456 CMR, § 22.05