|(a) Beginning with the 1997-1998 school year, all school districts have two choices in selecting a method to appraise teachers: a teacher-appraisal system recommended by the Texas commissioner of education or a local teacher-appraisal system. (b) The commissioner's recommended teacher-appraisal system, the Professional Development and Appraisal System (PDAS), was developed in accordance with Texas Education Code (TEC), §21.351. (c) The superintendent of each school district, with the approval of the school district board of trustees, may select the PDAS. Each school district or campus wanting to select or develop an alternative teacher-appraisal system must follow TEC, §21.352. (d) The commissioner may designate a regional education service center to serve as the PDAS certification provider for the state. The designated regional education service center may collect appropriate fees under TEC, §8.053, from school districts and open-enrollment charter schools for training and certification.