The purpose of this study was to determine the effectiveness of group guidance services with visualization techniques in increasing students' resilience against bullying. The research method used was quantitative with a nonequivalent control group design. The sample consisted of 20 students of class VIII of MTsN 2 Medan who were divided into an experimental and a control group. The researcher prepared a bullying resistance scale that was used in the research instrument. The paired sample t-test statistical test results showed a significance value of 0.000 < 0.005, indicating a statistically significant difference between the pre-test and post-test scores in the experimental class. In contrast, the significance value of the control class was 0.021 > 0.005, indicating no significant change. The independent samples t-test results also showed a significant difference between the two groups, namely a significance value of 0.000 < 0.005. Thus, group guidance services with visualization techniques are effective in increasing students' resilience against bullying.
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