Erviana, V.Y., Divia, B. and Yiheng, M. 2026. The Effectiveness of Problem-Based Learning on Elementary Students’ Critical Thinking and Problem-Solving Skills. International Journal of Learning Reformation in Elementary Education. 5, 01 (Jan. 2026), 16–30. DOI:https://doi.org/10.56741/IISTR.ijlree.001330.