Dr. Muhammad Zeeshan, Nargis Parveen, Hajira Bibi. IMPACT OF PROFESSIONAL DEVELOPMENT ON INSTRUCTIONAL QUALITY AMONG SECONDARY SCHOOL TEACHERS: THE MEDIATING ROLE OF EFFECTIVE TEACHING PRACTICES AND THE LEARNING ENVIRONMENT. JSSD [Internet]. 2026 Jun. 5 [cited 2026 Sep. 17];5(4):19-43. Available from: https://jssd.org.pk/index.php/jssd/article/view/249