Okla. Admin. Code § 432:1-5-9
All findings of fact shall be based exclusively on the evidence presented and on matters officially noticed. A final order adverse to a party in any individual proceeding shall be in writing or stated in the record. A final order shall include findings of fact and conclusions of law, separately stated. Findings of fact, if set forth in statutory language, shall be accompanied by a concise and explicit statement of the underlying facts supporting the findings. If, upon request, a party submits proposed findings of fact, the order shall include a ruling upon each proposed finding. Parties shall be notified either personally or by mail or any order. A copy of the order shall be delivered or mailed forthwith to each party and to his attorney of record, if any.
Okla. Admin. Code § 432:1-5-9