Issaranusorn, N., Nasok, P., Srirak, W., Mesub, S., Mangsachart, R. and Saduakdee, S. (2026) “The Development of Mathematics Learning Achievement in Data Presentation and Interpretation using Graphs through the Teams–Games–Tournament (TGT) Instructional Model Integrated with Polya’s Problem-Solving Process for Grade 7 Students ”, Education journal Faculty of Education, Nakhon Sawan Rajabhat University . Nakhon Sawan,Thailand, 9(2), pp. 131–144. doi: 10.2774.EDU2026.2.285861.