The research was conducted to determine the effectiveness of group counseling Cognitive Behavior Therapy (CBT) approach with Self-instruction technique to reduce insecure feelings of class VIII A students at MTs Nurul Iman Sukojati BanyuwangiThis study used a quasi-experiment with a one group pretest and posttes design. The research sample was selected using nonprobability sampling design technique using purposive sampling. The sample selection obtained 6 students from a total of 30 students who were categorized as high insecure feeling questionnaire scores. The data collection techniques used were insecure feeling questionnaire and observation. Researchers used data analysis techniques with the Statistical Program For Social Sciences (SPSS) 2.5 for windows 11 test obtained a t value of 8.253, which means that there has been a decrease in students' feelings of insecurity. With df = n-1 obtained df = 5 at a significant level of 5% then obtained t table 2.015, meaning t count> t table (8.235> 2.015). Thus it can be concluded that Ha which reads "Group counseling Cognitive Behavior Therapy (CBT) approach with Self-instruction technique has an effect in reducing the insecure feelings of class VIII A students at MTs Nurul Iman Sukojati Banyuwangi
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