A research on the effects of the microteaching Multiple-Representation Lesson Study (MRLS) on pre-service Physics teachers’ critical thinking was conducted using a pre-test-post-test quasi-experimental design. Eighteen fourth year Bachelor of Secondary Education-Physical Science majors participated in the research. The experimental group employed the microteaching MRLS while the control group implemented the Traditional Instructional Planning Approach (TIPA). Data were gathered from multiple sources such as researcher-made written tests, interviews, diaries, and field notes. The Mann-Whitney U test was utilized to ascertain statistical difference between the experimental and the control group. Results revealed significant differences in the scores between the two groups in the overall critical thinking and on its sub-domains. Findings indicate beneficial effects of the microteaching MRLS in developing pre-service teachers’ critical thinking. Keywords: critical thinking, lesson study, multiple representations, physics education, pre-service teachers, science education.

The effects of the Active and Passive Microteaching Lesson Study (MLS) on the Technological Pedagogical Content Knowledge (TPCK) of the 18 pre-service Physics teachers were investigated using a pre-test-post-test quasi-experimental design. Scores from the contentbased TPCK test, interview responses, and journal entries were analyzed using both quantitative and qualitative techniques, specifically, the Mann-Whitney U test, the Wilcoxon Signed Ranks test, the conceptual content analysis, and the constant comparative method. Results revealed that the Active Microteaching Lesson Study (Active MLS) provided more beneficial effects on the pre-service Physics teachers' overall TPCK and certain components than the Passive MLS. The implications of the findings to research and practice were discussed. Recommendations for future research were also provided.

A pretest-posttest comparison-group quasi-experimental study was endeavoured to unravel the effects of the two forms of Microteaching Lesson Study (MLS), the Active MLS and the Passive MLS, on the critical thinking of aspiring physics teachers. Eighteen Bachelor of Secondary Education specializing in Physical Science students participated in the six-week study. Data were gathered using the Critical Thinking Inventory in Physics and were analysed utilizing the Wilcoxon Signed Ranks Test, Mann-Whitney U Test, and descriptive statistics. Results revealed that both the Active and Passive MLS have positive effects on the overall critical thinking and on all of the critical thinking sub-skills of the preservice teachers. Results further showed that the Active MLS is significantly more effective than the Passive MLS in developing overall critical thinking and its sub-skills, specifically, inference and interpretation. The implementation of lessons by the Active MLS group in microteaching sessions indicated positive affordances on the development of critical thinking. Further studies involving a greater number of preservice teachers specializing in different fields of science are recommended. The integration of the MLS, especially the Active MLS, in the preservice teaching curricula is deemed a worthwhile engagement.

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