This study aims to improve the learning outcomes of third-grade students (Class IIIA) at SDN Salatiga 12 through the implementation of the Project-Based Learning (PjBL) model supported by diorama learning media. The background of this study is the low learning outcomes of students, particularly in the IPAS (Science and Social Studies Integration) subject, which is partly due to the use of conventional teaching models without concrete learning media. Additionally, most students have a kinesthetic learning style and prefer physical, activity-based learning methods. This research is a Classroom Action Research (CAR) conducted in two cycles using the Kemmis and McTaggart model. The subjects of this study were 26 third-grade students at SDN Salatiga 12. In the first cycle, 14 students scored above the Minimum Mastery Criteria (KKTP), while 12 scored below, with an average score of 69.7 and a mastery percentage of 53.8%. In the second cycle, the number of students scoring above the KKTP increased to 17, while 9 students scored below, with an average score of 81.9 and a mastery percentage of 73%. Based on the research findings, it can be concluded that the use of the PjBL model can improve student learning outcomes in the IPAS subject.
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