This article provides a theoretical assumption and then a fragment of its testing on the material of a concrete study. The main premise of the study is dependence of students’ educational dynamics on the function of mediation, linking the dynamics of a student with the “cultural subject”. In this case – orientation of students of the Department of Psychology and Pedagogy at their own education, becoming a psychologist, solving professional tasks in the Organizational-activity game (the OAG) as an institution of mediation. The hypotheses are as follows:

-A change in the dynamics of educational relations is possible with the appearance of a new psychological objective, a new method of solving it.

-Eemergence, testing and assimilating of a new way of solving a psychological problem is provided by special techniques and organization of the space of the game.

-Such an organization can be set in the OAG.

The mechanism of development, which the OAG is based on -- is a conflict. It is their behavior in a conflict, that shows what is being objectified by students – an educational objective or their feelings—I as a future professional or I as an “offended” party in this situation.