Explored the construct validity of the Mutuality of Autonomy Scale (Urist. 1977), which assesses the developmental level of object relations based upon Rorschach percepts, within a nonclinical child population. Mutuality of Autonomy was found to be related to teacher ratings of interpersonal functioning in the classroom, and to academic grades but not to either standardized achievement or intelligence. In addition, the Mutuality of Autonomy Scale demonstrated predicted correlations with children's perceived control. Children with developmentally lower object relations scores were more likely to perceive “powerful others” or “unknown” sources as controlling outcomes, particularly within the social domain. The results are discussed in terms of the utility of the Mutuality of Autonomy Scale, and the significance of object relations for personality functioning.