A new theoretical approach - A. V. Petrovskiy's social-psychological theory of personality and collectives - has been used in order to study systemic interdependences between vocational intentions and personal attitudes of senior schoolchildren. It is shown that mechanisms underlying this interdependence are different in the IX-th and X-th form. Pupils of senior forms can be divided into subgroups in coppespondence with their vocational intentions. A conclusion is made that in senior forms there takes place a hidden process of intragroup vocational orientation.