This research is being done to test the effectiveness of an early intervention model for very young children at high risk for autism spectrum disorders (ASD) and their families. If children show improvement in this intervention, the investigators hope that the availability of public services of this type will be increased. Children between 11 months and 21 months old with Autism Spectrum Disorders, or with social and communication delays that indicate high risk for Autism Spectrum Disorders, and their parents may join the study. Treatment must start prior to the second birthday.