Specific Aim #3: Pilot RCT of the adapted P-ESDM with 40 preschool aged children with ASD exploring the impact on: a) child communication abilities and overall developmental outcome, as measured by the language subscale and composite scores of the Griffith Mental Developmental Scales, b) ASD social symptoms, as measured by the ADOS Social Affect score, and c) caregiver stress, as measured by the Parenting Stress Index.