This study aims to determine the effectiveness of the Project-Based Learning (PjBL) model based on STEAM with a Deep Learning approach in improving students' reflective thinking skills on flat shape material. This research used a descriptive quantitative approach with an experimental design involving two experimental classes. Data were collected through pretest and posttest. The results showed that the implementation of the PjBL-STEAM model has a positive and significant effect on improving students' reflective thinking skills, as indicated by the N-Gain score. This model also enhances students' critical and creative thinking skills. Therefore, it is recommended for elementary school learning.
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