Developing student’s critical thinking skills through implementation of problem based learning approach

Problem based learning is an educational approach which used problem as a contex for learning in order to develop multidiciplinary skill including critical thinking. However, limited research has been conducted regarding the impact of problem based learning on student's critical thinking skills in class. This research is a developmental research (R&D) using ADDIE model that aims to develop student's critical thinking skills through the implementation of student activity sheets that use problem based learning approach. The subject of this study were 2nd year students of science and mathematics programe in SMA Negeri 2 Sleman. Using pre-experimental with pretest-posttest design, the data were analyzed descriptively using N-gain indicator and analyzed parametrically using T-related sample test. Student's critical thinking skills were observed by observer and analyzed descriptively using percentage comparison. The study found that the problem based learning approach has signficant impact in improving student's critical thinking skills. Student's critical thinking skills in terms of analyzing, interpreting, evaluating, and concluding were increased. These criteria indicated that problem-based learning approach effective to develop student's critical thinking skills.