The research reported is predicated on the establishment of an empirically derived psychological typology of male delinquents. The schema for the classification of delinquents is based on those ego and super ego functions which have been shown most frequently to be of importance in understanding the dynamics of various delinquent types. This schema led to a differentiation of delinquents based on: 1) their attitudes toward conventional moral prohibitions; 2) the extent to which they are capable of controlling their impulses and of acting in accordance with their moral standards; and 3) their affective response to their delinquent behavior. The classification includes: 1) situational delinquents; 2) neurotic delinquents; 3) pseudo-socialized delinquents; and 4) psychopathic delinquents. The assessment procedures for determining type are based on three tests which are briefly discussed. This report concludes with short sections on the treatment for each type of delinquent. (KJ)