This study aims to investigate critical thinking training effectiveness. Forty students (34 females and 6 males) participated in this study. A quasi experimental within subject design was employed in this study. Measurement was done by translated Scientific Reasoning Scale in the pre- and post-test. Data were analyzed using paired samples t-test. The results showed a significant difference in critical thinking skills before (M = 39, SD = 18.9) and after the intervention (M = 70.2 SD = 23.5); t(39) = 8.5 p < 0.01, d= 1.35. This result indicates that the intervention is effective to improve critical thinking skills
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