Kuongtip S, Khechornphak T, Boontongtherng P. Development of Problem-based Active Learning Activities to Promote Science Learning Achievement of Grade 6 Students. IARJ [internet]. 2026 May 10 [cited 2026 Sep. 28];6(3):e291711 . available from: https://so03.tci-thaijo.org/index.php/IARJ/article/view/291711