Bullying is a serious problem that often occurs in school environments and can have a negative impact on students' psychological development. One factor that is thought to play a role in preventing bullying is assertive communication skills. Assertive communication allows students to express their opinions and feelings honestly and firmly without harming others. This study aims to determine the relationship between assertive communication and the likelihood of bullying behavior in grade XI students at SMA Negeri 5 Kota Bogor. This study uses a quantitative approach with a correlational method. The sample in this study was 177 students selected using a random sampling technique with the Slovin formula. Data collection was carried out through instruments in the form of an assertive communication scale questionnaire and a bullying scale questionnaire, with validity and reliability that have been tested previously. The results showed that the level of students' assertive communication was in the moderate category (64%), and bullying behavior was also dominated by the moderate category (78.8%). The Pearson Product-Moment correlation test showed a correlation coefficient value of r = -0.126 with a significance of p = 0.085 (p > 0.05), the results of the analysis showed a significant negative relationship between assertive communication and bullying behavior. This means that the higher the assertive communication skills possessed by students, the lower the chances of bullying behavior occurring in the school environment. This finding indicates that assertive communication can be used as one of the important materials in guidance and counseling services, especially in efforts to prevent and handle bullying cases systematically and sustainably.
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