The aim of this Bachelor thesis is to assess the frequency of bullying within the second level of primary schools and the lower grades of comprehensive schools. The first part of the work will primarily focus on theoretical explanation of bullying itself. It will introduce this behaviour along with its forms of occurrence in more detail. It will describe its development, step by step, and not only from the aggressor and the victim's points of view, but also from the audience's point of view (the audience are made up mostly of the schoolmates from the same class). Last but not least, it will focus on the preventive measures, which are supposed to prevent bullying in schools, and also how to detect it, solve it and eventually eliminate it. ...