As authorized by the Texas Education Code (TEC), Chapter 21, Subchapter H, the commissioner of education rules for a recommended teacher appraisal system; for a recommended principal appraisal system; and for a recommended administrator appraisal process for administrators other than principals are codified in Chapter 150 of this title (relating to Commissioner's Rules Concerning Educator Appraisal). Other appraisal systems may be locally developed and adopted by a school district according to the TEC, Chapter 21, Subchapter H, and Chapter 150 of this title.