In 21st century learning, students are asked to improve their competencies to improve their ability to collaborate, think critically, communicate and think creatively. Teachers must be able to develop these 4 (four) skills in students so that they can keep up with current developments. One of them is developing students' 21st century skills with the Project Based Learning learning model with a STEM approach. The research method uses a quasi-experimental method with an "One-Group Pretest-Posttest Design" research design. There was a significant increase in critical thinking skills from a score of 2.48 to 2.78 (scale 1 -3), collaboration skills from 2.44 to 2.75, creative thinking from 2.3 to 2.8 and communication skills from 2.34 to 2.76. The Project Based Learning learning model with a STEM approach is able to develop students' 21st century skills.
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