Özet:

Critical thinking skills play an important role in improving students' learning outcomes. The development of critical thinking skills and learning outcomes are also influenced by self-efficacy. Studies show that the students' critical thinking skills and learning outcomes have not been maximized due to low in students' self-efficacy. Therefore, the innovation in learning process is needed to tackle these problems. This study aims to determine whether the application of relating, experiencing, applying, cooperating, transferring (REACT) strategies combined with constructivism-based modules can improve the students' critical thinking skills, learning outcomes and self-efficacy. This study employed the experimental method with a pretest-posttest control group design. The research subjects were 105 students who were divided into two groups, namely the experimental group which consist of 54 students and the control group consist of 51 students. This research was conducted in the even semester of the 2019/2020 school year at Nagan Raya High School, Aceh, Indonesia. The parameters which measured here are the critical thinking skills, the learning outcomes and self-efficacy. Data on critical thinking skills and learning outcomes were analyzed using parametric statistical tests, and data for self-efficacy were analyzed using interval successive method (MSI). Data for the correlation among students' self-efficacy, critical thinking skills and learning outcomes were analyzed through correlation and regression analysis. The results indicate that the application of the REACT strategy combined with constructivism-based modules can improve students' critical thinking skills, learning outcomes and self-efficacy. Self-efficacy contributes to improve the students' critical thinking skills and learning outcomes.

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