This study aims to analyze the level of students' Science Process Skills (SPS) in the Problem Based Learning model in class XI SMAN/MAN Luwu Regency on the reaction rate material. The research sample consisted of 93 students from SMAN 1 Luwu, MAN Luwu, SMAN 7 Luwu, and SMAN 18 Luwu in the 2024/2025 academic year. The instrument used was descriptive questions on the reaction rate material. Data were collected by giving questions at school and analyzed using descriptive statistics. The results showed that the level of students' SPS was in the poor category with an average score of 40.76. Two SPS indicators, namely applying concepts and observation, were in the fairly good category, while the other three indicators were in the poor category.
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