The purpose of this examination paper is to get an understanding as an upcoming teacher about how friends make an important impact on children’s identity development in school, their choice of friends circle and what kind of groups there can occur among them. With a deeper comprehension of these circumstances should an educationalist be more considerate and adapt his or hers education to prevent negative group formations and to be an outsider. To achieve my results I used a qualitative research method where I through observation handpicked eight students from upper level of compulsory school with different friend circles from two classes for further interviews. Beside this I observed students in their school environment for three days. My conclusion by this research is that, the society, the school and the home are three very important factors that make big impact on children’s identity development. Even friendship has an important role on their development. Children choose their friends though common interest which can lead to group formations where negative group formations can occur.