Abstract: The authors examine and analyze modern concepts of mobbing (psychoenergetic concept, social learning theory, frustration concept) from the point of view of their explanatory value and predictive efficiency. The authors describe contradictions in the aforesaid theories and offer their solutions of these contradictions by defining psychological determinants of mobbing as a social and psychological phenomenon which, in its turn, constituted the theoretical basis of the empirical research. The empirical research nvolved 124 teenagers from secondary schools where cases of mobbing have been registered. The authors have used the survey and drawing research methods. The authors have analyzed the comparative analysis of self-conception profiles of teenagers studying in groups where mobbing has occured. The authors have also used the following psychodiagnostic methods, R. Pantileev's The Self-Concept Inventory, and Edward Wagner's The Hand Test. The subject of the research is the relationship between the teenagers' self-conception profiles and their level of aggressivity. By the means of the correlation analysis, the authors have defined the self-conception elements that determined various types of teenager aggression as the behavior model of mobbing and can be viewed as prognostic indicators of both the mobbing initiation and selection of the active or passive positions in the process of mobbing. According to the results of the research, there are four main parameters of self-conception that influence the level and nature of aggression: reservedness, self-guidance, internal propensity towards conflict, self-acceptance. The authors have also described various types of self-conception profiles of teenagers who either participate in mobbing or take a neutral stance. The results of the research allow to clarify the contents of the primary and secondary preventions of mobbing in teenager groups.