<![CDATA[Critical thinking skills are essential for students, yet junior high school students often show low levels of these abilities. Previous studies using Google Sites did not integrate the Problem-Based Learning (PBL) model or focus specifically on respiratory system content and critical thinking. This study aims to develop a PBL-based Google Sites e-module on the respiratory system that is valid, practical, and effective in improving critical thinking skills. The development followed the ADDIE model: analyze, design, develop, implement, and evaluate. Data were collected through questionnaires and tests and analyzed descriptively to assess validity, practicality, and effectiveness. Validation results showed the material was highly valid (84.89%) and the media valid (79.47%). Practicality tests based on teacher and student assessments resulted in scores of 94.68% and 92.71%, respectively, indicating the media was very practical. The effectiveness was supported by an independent sample t-test showing significant differences in critical thinking scores between experimental and control classes. The average N-Gain score of 0.67 in the experimental class indicated a moderate improvement, and a Cohen’s d effect size of 1.21 suggested a large impact. This e-module is valid, practical, and effective for science learning, particularly in supporting teachers to implement student-centered learning that fosters critical thinking.]]>
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