Ohio Rev. Code Ann. § 3319.112
(A) Not later than December 31, 2011, the state board of education shall develop a standards-based state framework for the evaluation of teachers. The state board may update the framework periodically by adoption of a resolution. The framework shall establish an evaluation system that does the following:
(1) Provides for multiple evaluation factors. One factor shall be student academic growth which shall account for fifty per cent of each evaluation, except as otherwise prescribed by the alternative framework under section 3319.114 of the Revised Code. When applicable to the grade level or subject area taught by a teacher, the value-added progress dimension established under section 3302.021 of the Revised Code or an alternative student academic progress measure if adopted under division (C)(1)(e) of section 3302.03 of the Revised Code shall be used in the student academic growth portion of an evaluation in proportion to the part of a teacher's schedule of courses or subjects for which the value-added progress dimension is applicable. If a teacher's schedule is comprised only of courses or subjects for which the value-added progress dimension is applicable, one of the following applies:
(B) For purposes of the framework developed under this section, the state board also shall do the following:
(1) Develop specific standards and criteria that distinguish between the following levels of performance for teachers and principals for the purpose of assigning ratings on the evaluations conducted under sections 3311.80, 3311.84, 3319.02, and 3319.111 of the Revised Code:
(D) To assist school districts in developing evaluation policies under sections 3311.80, 3311.84, 3319.02, and 3319.111 of the Revised Code, the department shall do both of the following: