Troubles in an adolescent's relations with his classmates, breaking-off of his formal and personal contacts with them may have many-sided negative consequences for development of his personality. The article deals with the problem of control and settlement of conflicts connected with rupture of interpersonal relations between adolescents. Concrete examples taken out of school-life experience are used to demonstrate both erroneous, inefficient methods of exerting influence on inimical adolescents, and possible constructive ways to deal with such conflicts. Principal psychological, and typically adolescent, factors instrumental in production of a chain of antagonistic interactions between an adolescent and his milieu are listed and discussed.