This research aimed to describe the improvement of students' critical thinking skills after applying Case Based Learning (CBL) model. The research method used in this study is quantitative research with a pre-experimental design approach (one group pretest and posttest) with the aim of providing treatment to one experimental group without a control group. Furthermore the data was analyzed using normalized gain to see the increase in students' pre-test and post-test. The results of the analysis show that the students' critical thinking skills test results increased by 0.78 so that they obtained the high criteria.
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