<![CDATA[The purpose of this study is to analyze the effect of the Problem Based Learning (PBL) model assisted by the Smart Box KAYA media on the critical thinking skills and learning activeness of fifth-grade students at SDN Susukan 01 Ungaran Timur. This research employed a quasi-experimental method with a Nonequivalent Control Group Design, in which class VB served as the experimental group and class VA as the control group. The experimental group received PBL instruction supported by Smart Box KAYA, while the control group received PBL without the media. Data were collected through critical thinking tests and learning activeness questionnaires. The results showed a significant difference in students’ critical thinking skills between the experimental and control groups, indicated by a significance value of 0.000 < 0.05 and a higher mean score in the experimental class (75.32) compared to the control class (70.79). Furthermore, the Smart Box KAYA–assisted PBL model significantly influenced students’ critical thinking skills, as evidenced by the regression test (F = 7.929; sig. 0.009 < 0.05). Students’ learning activeness also increased significantly, with an average score of 83.23 in the experimental class, higher than 73.67 in the control class, supported by a significance value of 0.000 < 0.05. Simple regression analysis further confirmed the influence of Smart Box KAYA–assisted PBL on learning activeness with a significance value of 0.003 < 0.05 and R² = 0.270. Overall, the study concludes that the Problem Based Learning model assisted by Smart Box KAYA is effective in improving both students’ critical thinking skills and learning activeness.]]>
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