Situations when a pupil breaks a norm of a collective work have been studied. It is established that the co-workers of such a pupil basically control the probability of appearance of a psychological barrier; much more seldom they take care to make him to comprehend the consequences of his act and practically never they force him to determine independently the course of his further behavior. Correlation between the mode of influence on the breaker of the norm and the development of the situation in question is shown and discussed.