(a) Because the educational diagnostician plays a critical role in campus effectiveness and student achievement, the rules adopted by the State Board for Educator Certification in this subchapter ensure that each candidate for the Educational Diagnostician Certificate is of the highest caliber and possesses the knowledge and skills necessary to improve the performance of the diverse student population of this state.(b) An individual serving as an educational diagnostician is expected to actively participate in professional development activities to continually update his or her knowledge and skills. Currency in best practices and research as related to both assessment and student learning is essential.(c) The holder of the Educational Diagnostician Certificate issued under the provisions of this subchapter may serve as an educational diagnostician, including providing educational assessment and evaluation, as required by the Individuals with Disabilities Education Act (IDEA) or other applicable law, for students from birth through adulthood.