The urge towards competence.
D000124:Achievement; D002648:Child; D002652:Child Behavior; D002653:Child Behavior Disorders / Q000628:therapy; D002657:Child Development; D002675:Child, Preschool; D002658:Developmental Disabilities / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D009042:Motivation; D009788:Occupational Therapy; D010989:Play Therapy; D010988:Play and Playthings