This study aims to determine the effect of the application of the Project Based Learning (PjBL) model on the learning outcomes and critical thinking skills of grade V elementary school students on the intrinsic elements of the story. The study used a pseudo-experiment method with a fixed group design and involved 90 students of SD Khadijah 3 Surabaya who were proportionally divided into experimental and control groups. The research instruments include multiple-choice tests, essays, documentation, and questionnaires. The results showed that the application of PjBL could significantly improve students' critical thinking skills, with the N-gain score of the experimental group reaching 57.6% (the category of quite effective), compared to the control group of 15.46%. However, the effectiveness of PjBL on academic learning outcomes based on conventional tests is still low, with the average N-gain of the experimental group of 12.49% and the control group of 18.58%. Thus, PjBL is recommended to improve students' critical thinking skills, but it is still necessary to develop assessment strategies so that academic learning outcomes can also be optimal.
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