Okla. Stat. tit. 12 § 577.1
Inasmuch as many judgments in actions tried by juries are set aside and vacated on account of errors in instructions; and, whereas, justice is withheld, delayed, and, in some cases, denied on account of such erroneous instructions; and, the compilation and adoption of a body of uniform instructions in civil and criminal cases tried by juries in the courts of this state is necessary to the equal and uniform administration of justice; and, whereas, the justices and judges of the appellate courts of this state are in the best position to properly prescribe such instructions on this subject to the Legislature; the Supreme Court of the State of Oklahoma and the Court of Criminal Appeals of Oklahoma are respectively requested and authorized to proceed to prescribe and institute uniform instructions to be given in jury trials of civil or criminal cases, such instructions to be called: "Oklahoma Uniform Jury Instructions." (OUJI).
Okla. Stat. tit. 12, § 577.1