Sensory integration is the ability to modulate sensory information. Disorders in sensory integration influence a person's behavioral response to their environment. This randomized control pilot study intends to research the effectiveness of sensory integration interventions in children diagnosed with Autism or Pervasive Developmental Disorder Not Otherwise Specified (PDD-NOS) based on the DSM-1V criteria. The investigators hope to develop pilot data that will guide further development of randomized controlled trials of sensory integration interventions. There will be 50 participants in the study between the ages of 6 and 12 years old who attend a summer therapeutic program for children with Pervasive Developmental Disorders. The participants will be randomly assigned to either the treatment group or an alternative treatment group. Those assigned to the treatment group will receive direct sensory integration-based treatment three times a week for 45 minutes over a six week period of time. The alternative treatment group will participate in individual non-sensory based activities for the same amount of time. The study will measure behaviors reflective of sensory modulation, social responsiveness, and adaptability before and after the interventions. What this means for people with autism: Deficits in sensory processing are considered prevalent in children with developmental disabilities. This study explores the impact of sensory integration treatment interventions on children diagnosed with autism or PDD-NOS.