As authorized by the Texas Education Code (TEC), Chapter 21, Subchapter H, the commissioner of education rules for a recommended teacher appraisal system, known as the Professional Development and Appraisal System (PDAS), and for a recommended administrator appraisal process, 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.