<![CDATA[This study aims to study the effect of problem-based learning integrated STEM and non-STEM learning models in improving critical thinking skills and their differences of learning process. The method used is a quasi-experimental design with a pretest-posttest non-equivalent control design. The population of all students in class X science with non-probability sampling was 36 students each. The instruments used were observation sheets, description questions, and questionnaires. The results showed that the average percentage of STEM-integrated problem-based learning implementation was 96.00% and 93.00% without STEM, both of which showed very good results. The average critical thinking ability of students in the STEM integrated problem-based learning class is 71% and 59% without STEM, this is shown by the average value of the STEM integrated problem-based learning classes is greater than without STEM. The linear regression test using STEM integrated problem-based learning has a positive effect on critical thinking skills 2.251, t-count > t-table (3.756 > 2.032), Ho is rejected Ha is accepted, and without STEM there is no effect on critical thinking skills, with a t-count <t-table (2.016 < 2.032). The results showed that the STEM-integrated problem-based learning model had a positive effect on students' critical thinking skills on electrolyte and non-electrolyte solution materials.]]>
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