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Learning objectives can be achieved if students are diligent in learning activities. Student activeness can be assessed through their involvement in study groups, responsibility, and how they express their opinions. Therefore, problem-based learning materials are necessary to train students' thinking skills and to ensure they are active in learning activities. The aim of this research is to develop a student worksheet product based on problem-based learning on the human circulatory system material, to test the product's validity, and to assess the product's practicality. The mechanism used in this research is Research and Development (R (2) it is considered very valid as evidenced by an average of 90% for media expert assessments; (3) student responses to the worksheet are very good with an average of 95.37%; (4) based on practitioner expert tests, it is stated to be very valid with an average of 94.7%.
Prasetyo et al. (Thu,) studied this question.