The current study aimed to investigate the effectiveness of SFBC to decrease social agresive behaviour among the students of 12th grade in SMA Muhammadiyah 1 Prambanan. This study was an experiment study and used pre-experimental design employing one group pretest posttest model. The subject of this current study was students of 12th in SMA Muhammdiyah 1 Prambanan. In determining the subject, the researcher used nonprobablility sampling design with purposive sampling. The finding found a significant difference between students' social agresive level before and after they were treated with SFBC based on creative arts.
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