<![CDATA[This study aims to test the effectiveness of group counseling services with the Cognitive Behavior Therapy (CBT) approach in reducing the level of social anxiety in grade X students. This study uses a quantitative approach with a quasi-experiment model (quasi-experiment) pretest-posttest control group design. The research sample amounted to 18 students of class X who were selected through purposive sampling techniques based on high to very high category social anxiety scores. The sample was divided non-randomly into two groups: 9 students in the experimental group who received CBT intervention for 6 sessions, and 9 students in the control group (waiting list). The data collection instrument used the social anxiety Likert scale with 40 statement items. Data analysis was conducted using the Independent Sample t-Test assisted by IBM SPSS Statistics software. The results of the descriptive analysis showed that the average score of the difference in social anxiety reduction in the experimental group was 15.00 and the control group was 19.78, with a relatively large effect size of the intervention (Cohen's d = -0.871). However, the results of the hypothesis test showed a significance value of 0.083 (p > 0.05). Thus, it can be concluded that statistically there was no statistically significant difference between the experimental group and the control group. CBT-based group counselling services descriptively show a decrease in social anxiety, but have not been significantly and statistically convincing in the context of this study, which is likely influenced by the lack of sample numbers and the distribution of initial data that is not normally distributed.]]>
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