Abstract
This study aims to determine the effect of the problem based learning (PBL) model on students' critical thinking skills in the subject of the human circulatory system in class XI IPA SMAN 1 Na IX-X Aek Kota Batu, Labuhan Batu Utara Regency. This research is a quantitative research with a quasi-experimental approach (Quasi experiment). The instrument used is a test in the form of a description of 12 questions that have been validated by experts. The sampling technique was carried out by cluster random sampling with a total sample of 60 students consisting of two classes of 120 research populations.The results of hypothesis testing using the Independent sample t test statistic show that there is a significant effect between the PBL model on improving students' critical thinking skills in the human circulatory system material in class IX SMA Negeri 1 Na IX-X Aek Kota Baru, North Labuhanbatu Regency.
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