The low level of critical thinking skills among students is a significant challenge in modern education. This study aims to determine the effect of group guidance services using sociodrama techniques on increasing the critical thinking skills of students at SMP Negeri 9 Bandar Lampung. This research uses a quantitative approach with a pre-experimental method (One Group Pretest-Posttest Design). The population in this study were students of class VIII, with a sample of 10 students selected through purposive sampling. Data collection was carried out using a critical thinking skill scale based on Ennis' indicators. Data analysis used the Paired Sample T-Test. The results showed a significant increase in the mean score from 75.60 (pretest) to 110.40 (posttest). Statistical analysis obtained a t-value of 16.232 with a significance of 0.000 < 0.05. It can be concluded that the sociodrama technique in group guidance is effective in improving students' critical thinking skills, especially in aspects of focus, reason, and inference.
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