A decision by the Commission shall be made by a majority of the members present at the hearing. The presiding officer shall prepare the Commission's final decision and order in writing that includes findings of fact and conclusions of law that are based exclusively on testimony, evidence, and other matters that are a part of the hearing record. The Commission shall deliver or mail a copy of the decision and order and accompanying findings and conclusions to each party or the party's counsel of record. Unless specified otherwise, orders of the presiding officer or the Commission shall be immediately implemented.