<![CDATA[This research attempts to evaluate how effectively the critical thinking abilities of junior high school are improved by the RADEC learning model with the SSI approach. Critical thinking abilities is crucial for students since they can evaluate data, make conclusions, and make evidence-based decisions. This skills is essential for junior high school students to meet the demands of 21st-century education, particularly in science courses. Unfortunately, critical thinking abilities among students remain rather low. This study aims to ascertain if critical thinking abilities of students may be are improved by using the SSI-based RADEC learning paradigm. This study used a quasi-experimental, quantitative methodology with a non-equivalent control group design. The results of the Mann-Whitney test demonstrates the worth of of 0.000, showing a significant difference. Students obtained a pre-test score of 46.66 and a post-test score of 78.74 on the critical thinking skills test, showing a significant increase in critical thinking skills. The N-Gain test, which showed an average critical thinking skill score of 0.602 which was classified as moderate, supported the findings of thus investigation. This study finds that students’ capacity for critical thought have been successfully are enhanced by SSI-based RADEC learning approach.]]>
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