(a) The State Board of Education (SBOE) shall adopt a review and adoption cycle for instructional materials for prekindergarten and for elementary and secondary grade levels for each subject in the required curriculum.     
      (b) In adopting the cycle, the SBOE:      
        (1) is not required to review and adopt instructional materials for all grade levels in a single year; and       
        (2) shall give priority to instructional materials in the following subjects:                  (A) foundation curriculum subjects for which the essential knowledge and skills have been substantially revised and for which assessment instruments are required under the Texas Education Code (TEC), Chapter 39, Subchapter B, including career and technical education courses that satisfy foundation curriculum requirements as provided by the TEC, §28.002(n);                   (B) foundation curriculum subjects for which the essential knowledge and skills have been substantially revised, including career and technical education courses that satisfy foundation curriculum requirements as provided by the TEC, §28.002(n);                   (C) foundation curriculum subjects not described by subparagraph (A) or (B) of this paragraph, including career and technical education courses that satisfy foundation curriculum requirements as provided by the TEC, §28.002(n); and                   (D) enrichment curriculum subjects.         
        (3) The adoption cycle for subjects in the foundation curriculum shall be organized so that instructional materials for not more than one-fourth of the subjects in the foundation curriculum are reviewed each biennium. A full and complete investigation of instructional materials for each subject in the foundation curriculum shall occur every eight years unless content of instructional materials for a subject is sufficiently current. Estimated expenditures and historical or expected legislative appropriations shall be considered when determining placement of subjects in the cycle.       
        (4) The adoption cycle for subjects in the enrichment curriculum shall be organized so that placement of a subject in the cycle is based on the need for up-to-date materials that align to revised Texas essential knowledge and skills or the addition of new courses. Estimated expenditures and historical or expected legislative appropriations shall be considered when determining placement of subjects in the cycle.       
     Source Note:        The provisions of this §66.21 adopted to be effective September 1, 1996, 21 TexReg 7236; amended to be effective March 4, 2001, 26 TexReg 1706; amended to be effective July 8, 2012, 37 TexReg 4911; amended to be effective May 21, 2014, 39 TexReg 3855; amended to be effective May 5, 2016, 41 TexReg 3137