Applied Behavior Analysis (ABA) is an approach that uses scientific principles to encourage socially appropriate behaviors while reducing problem behaviors. Occupational Therapists actively use this approach in order to improve treatment outcome for children with variety of developmental disorders. By utilizing ABA approach, Occupational Therapists is trying to improve child's performance in child's skills and crucial areas of life. OT sessions equiped by ABA target social skills, communication, cognitive skills, ADLs, behavioral and motor skills. The ABA method utilizes a discrete trial teaching method that is data based and teacher directed. Simple responses are systematically built into more complicated responses and there is an emphasis upon teaching children in their own natural environment.