This article suggest instrument of diagnostics of the relationships among the pupils in the class. That instrument is used as a mean for assessment of the bulling in the school class. There are described the version of that programme for the network and for the internet, the clients for the pupils and client for data reading. There was created special programme for the assessment of the datas, that presents data both in the graphical and textual form. The results of the research can be assessed in terms of the pupils. That programme makes possible to range the results accordance with time and follow the influence of the corrective action. There have been surveyed 386 people up to now and the results can be successfully apllied.