<![CDATA[This research aims to develop a problem-based learning model "Runggu Rakut Sitelu” (PBL_RAS) on the material “Ecology and Biodiversity of Indonesia '' which is valid, reliable, practical and effective. This research method uses the Plomp development procedure. The subjects in the research were SMP Negeri 4 Salatiga City. Data analysis using test paired sample t-test, test independent sample t-test and test N-Gain. Based on the research results, it was proven that the learning model, learning tools and research instruments used were declared valid and reliable. The practical learning model to be used with a score of 4.9 in the category was all implemented and student responses obtained a score of 0.8 in the very positive category. Based on test results paired t-test It is proven that the PBL_RAS learning model has an effect on critical thinking skills with gradesp-value 0.01<α 0.05 with gainN-Gain reaching 0.64 in the medium category. Test analysis results independent sample t-test show-value of 0.02 < α 0.05 so it is known that there is a significant difference in the influence of learning models on students' critical thinking skills between PBL_RAS and PBL classes with gradesN-Gain in the control class it was 0.53 in the medium category. Based on the research results, it can be concluded that the development of the PBL_RAS learning model is declared valid and reliable and proven to be practical and effective in improving students' critical thinking skills in science lessons.]]>
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