<![CDATA[This study aims to determine the effect of project-based learning models on students' critical thinking skills on biodiversity material at SMA Negeri 2 Kuta Baro. This research is a quantitative study. This type of research is pre-experimental with a One Group Pretest-Posttest design. The population is all students of class X IPA SMAN 2 Kuta Baro. The sample in this study amounted to 20 people from class X IPA I. The research instrument used was a 20-item multiple-choice test. Data analysis techniques used the N-Gain test and T test to test the hypothesis. N-gain 0,7185 with a high category. This study shows that there is a significant influence of the project-based learning model on students' critical thinking skills on biodiversity material in class X IPA 1 SMAN 2 Kuta Baro. With N-gain 0,7185 with a high category and calculated t-value greater than the t-table 31,848 > 2,093. In the eta squared test results, the pretest value was 0,853 while the posttest value was 0,871]]>
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