The aim of this research was to know the effectiveness of group counseling by selftalk technique to improve the social adjustment of boarding high school students. This research was an experimental research by using pre-experimental method with the plan one group pretest posttest design. The subjects of this research were 14 students who had low score of their pretest. The data analysis in this research was using Wilcoxon test. Based on the result of hypothesis test, it could be known that there were a rise score between before and after giving the treatment. The result of the data analysis by using Wilcoxon was indicate p value=0.001 (0.001< 0.05), it means that Ha was received. Conclusion of this research was selftalk technique effective to improve the social adjustment of biarding high school students.
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