International Journal of Academic Multidisciplinary Research (IJAMR)   Year: 2022 | Volume: 6 | Issue: 12 | Page No.: 343-349 The effectiveness of Challenge Based Learning and Case Based Learning to improve students' Critical Thinking Skills Download PDF Ria Mualimatul Ulum, Nurul Umamah, Sumardi Abstract: This study aimed to investigate the effectiveness of increasing the critical thinking skills of students who were taught using a Challenge Based Learning model and a Case Based Learning model in history subjects. This research was a quasi-experimental design with a sample of 66 senior high school students. Data collection used a performance test (project) in the form of historical stories. The data analysis technique was the t-test (Paired Sample t-Test). The results of the t-test analysis of the critical thinking skills of students taught with the Challenge Based Learning model obtained an average value of 75.18. Meanwhile, the average value of students' critical thinking skills with a Case Based Learning model was 69,12. Based on these results, it can be concluded that the Challenge Based Learning model is more effective in improving students' critical thinking skills with a higher effectiveness level than the Case Based Learning model of 0.72. The recommendation from the results of this study is that optimizing students' critical thinking skills in history learning can be done using the Challenge Based Learning model because it is more challenging and fun.