This study aims to examine the effectiveness of the STEMDISLEARN module on students' critical thinking skills in the DE Course. This research design employed a quasi-experimental non-equivalent pre-test and post-test group. The samples amounted to 123 students, consisting of 64 students in the experimental group and 59 students in the control group. The experimental group used the learning treatment with the STEMDISLEARN module, while the control group employed conventional learning. Meanwhile, the t-test was used as the data analysis technique. Results showed that the two groups had no difference in the average scores of their critical thinking skills before treatment. After treatment, however, there was a difference in the average pre-test and post-test scores between the experimental and control groups. The average post-test scores for critical thinking skills in each group were better than the pre-test scores. However, the increase in the average scores for the experimental group was higher than in the control group. Thus, the STEMDISLEARN module is effective in improving students' critical thinking skills in a DE course.