<![CDATA[This study was motivated by the low learning outcomes of fourth-grade students in Natural and Social Sciences (IPAS) at SD Negeri 02 Jantiharjo Karanganyar. The learning process was still dominated by teacher-centered instruction, resulting in limited student participation and underdeveloped collaborative skills. This study aimed to determine the effect of the collaborative Project Based Learning model on students' IPAS learning outcomes. The research employed a quantitative approach using a One Group Pretest–Posttest Design. The sample consisted of 37 fourth-grade students selected through saturated sampling. Data were collected using tests, observations, and documentation. The data were analyzed using the normality test, Paired Sample t-Test, and N-Gain test with IBM SPSS Statistics 25. The findings revealed that the average score increased from 47.30 in the pretest to 70.76 in the posttest, with an improvement of 23.46 points. The Paired Sample t-Test showed a significance value of 0.000 (<0.05), indicating that the collaborative Project Based Learning model had a significant effect on students' learning outcomes. Furthermore, the N-Gain score was 0.4643, which falls into the moderate category. Therefore, the collaborative Project Based Learning model is effective as an alternative instructional approach to improve elementary students' IPAS learning outcomes.]]>
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