The initial session play therapy behaviors of maladjusted and adjusted children were compared to investigate the value of children's play for diagnostic purposes. The frequency and the intensity of 13 categories of play behaviors were considered as factors in discriminating maladjusted children from adjusted children. The 15 children in the maladjusted group had been referred by their parents for counseling but had not been in counseling previously, and their teachers had reported that they had exhibited two or more behaviors indicative of emotional disturbance. The 15 children in the adjusted group were rated by their teachers as exhibiting none of the behaviors Indicating emotional disturbance, and their parents recognized no need for counseling. All subjects were 5 to 9 years of age, and the two groups were matched for age and sex. The Play Behaviors Adjustment Rating Scale (PBARS) was used to rate each child's play behaviors in an initial videotaped 36-minute play therapy session. The frequency and the intensity were rated for thirteen play categories: exploratory, incidental, creative or coping, dramatic or role, relationship building, relationship testing, self-accepting, self-rejecting, acceptance of environment, nonacceptance of environment, positive attitudinal, ambivalent attitudinal, and negative attitudinal. The results of the chi-square analysis indicated that maladjusted children exhibited significantly more self-accepting and nonacceptance of environment behaviors as well as more intense dramatic or role behaviors and acceptance of environment behaviors than did adjusted children. Further investigation showed: (a) maladjusted girls expressed dramatic or role behaviors more often and more intensely than maladjusted boys, (b) maladjusted boys showed more self-accepting and nonacceptance of environment behaviors than maladjusted girls, (c) maladjusted boys exhibited more self-accepting behaviors than adjusted boys, (d) adjusted girls expressed more positive attitudinal behaviors than adjusted boys, and (e) adjusted boys engaged in more exploratory play and were more intense in negative attitudinal play than adjusted girls.