<![CDATA[This research aims to determine the effect of group counseling services in improving adolescents self-concept. Quantitative approach with one group pre-test post-test experimental method. Sampling was carried out using a purposive sampling technique, with a total of 120 adolescents. The samples were classified into two groups, namely the experimental group and the control group. Meanwhile, the effect of the intervention is described through data analysis techniques that go through the stages of normality test, correlation test, and independent sample t-test. Empirically, the results of this study show that group counseling is effective in improving adolescents' self-concept. Based on the t-test for equality of means, the Sig value is known (2-tailed) is 0,000 <0,05 which indicates that there is a significant difference between the average self-concept scores of adolescents in the experimental group. Apart from that, the effect of group counseling was shown by the self-concept score of the experimental group teenagers which increased from 49,52 percent in the pre-test to 86,62 percent in the post-test. After being given intervention through group counseling, it was determined that the self-concept of the experimental group teenagers was in the high category. ]]>
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