<![CDATA[This study examines the effectiveness of Project Based Learning (PBL) in improving the cognitive abilities of elementary school students, especially critical thinking, problem solving, and conceptual understanding. The research used a quasi-experimental design involving 40 fifth-grade students at Magetan State Elementary School 1. The students were divided into two groups: an experimental group that used PBL and a control group that used conventional learning. Data were collected through cognitive ability tests administered as pre-test and post-test. The results showed that students in the experimental group achieved a higher improvement than those in the control group. The average post-test score in the experimental group increased by 20.1 points, while the control group increased by only 3.5 points. Statistical analysis using t-tests and ANOVA showed a significant difference between the two groups, with p < 0.05. These findings indicate that PBL can improve students’ cognitive abilities and support the development of 21st-century skills. This study suggests that PBL should be integrated into elementary school learning to improve educational quality.]]>
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