<![CDATA[Adolescent problems are a form of failure to adapt for teenagers, one of the problems of teenagers is bullying. Bullying is aggressive behavior carried out intentionally by a group or induvidu repeatedly, from time to time against victims who are considered weak and cannot defend themselves. Bullying can disrupt the learner's process, thereby disrupting cognitive development in teenagers. The aim of this research is to determine the relationship between teenagers' cognitive development and bullying behavior at Sindangjawa Middle School. The research method used by the author is analytical survey research, namely identifying the relationship between cognitive development and bullying behavior at Sindangjawa Middle School with a cross sectional approach. With a population of 176 teenagers from Sindangjawa Middle School and a sample of 71 people using questionnaires. As a result of this study, teenagers who experienced moderate cognitive development with moderate intensity of bullying behavior were 22 people (31%), the results of the chi square test received a p value of 0.568 (p value>0.05), which means Ha was rejected and showed that there was no significant relationship between the relationship between cognitive development and bullying behavior at Sindangjawa Middle School.]]>
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