This study aims to determine the differences in the effectiveness of inquiry learning on several levels towards improving science process skills with different initial knowledge. The study design uses quasi-experimental treatment with pre-posttates in the control group and the experimental group. Class X MAN Sampang and SMAN 1 Sampang students in 2018/2019 school year. Samples were grouped into three treatment groups. The experimental group 1 applied level 3 inquiry learning (PIT-3), the experimental group 2 applied level 4 inquiry learning (PIT-4) and the control group applied level 2 inquiry learning (PIT-2). The science process skills test uses multiple choice objective questions with a test reliability of 0.77. Data analysis uses ANOVA test. This study concludes level 2 (PIT-2), level 3 (PIT-3) and level 4 (PIT-4) inquiry learning has a difference in effectiveness in improving science process skills. Improved science process skills of students with different initial knowledge, most effective in the application of inquiry level 3 (PIT-3) learning, students with high and low initial knowledge gain a higher gain than the application of level 2 (PIT-2) and level 4 inquiry learning (PIT-4).
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