The purpose of this study is to explore the differences and similarities regarding the causes of and approaches to bullying among a number of girls and boys in third grade in two schools. One of the schools is in a mono-ethnic area and the other in a multi-ethnic. The purpose isto compare the results between the schools and the questions proposed are: What is the reason for the bullying? What are the differences and similarities in existing opinions on the practice of bullying? What are the differences and similarities of students' opinions on bullying in a mono-ethnic and in a multi-ethnic school? I have chosen to use gender and ethnicity theories and the study was conducted through qualitative group interviews. The results have shown that boys' explanations for bullying are more aggressive than girls, although approaches to bullying were more related with violence among boys. The multi-ethnic school uses more direct bullying compared to the mono-ethnic school where indirect bullying occurred more often. My conclusions are that general knowledge about the subject is not enough to be able to counter bullying. It’s necessary to be familiar with how bullying occurs in that individual school because there can be large differences in the approaches when dealing with bullying from school to school.