Mansup, M. , Meesup, P. and Rimcholakarn, Y. 2021. A Study of the Needs Conditions for Development of a Combined Model of Active Proactive Learning with KWDL Techniques to Enhance Mathematical Problem Solving Skills for Junior High School Students. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University. 15, 2 (Jun. 2021), 468–482. DOI:https://doi.org/10.14456/psruhss.2021.36.