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The study involved a single subject, a non-verbal child on the autism spectrum, in a clinical setting over a 10 week period. The subject was on a three point sensory diet that was administered before therapy sessions. The tactile, vestibular and proprioceptive systems were targeted with deep pressure touch, a suspension swing, and joint compression. The primary focus was on participation in therapy and language development with specific attention given to the increase of vocalizations and/or verbalizations. The child experienced the sensory diet for schedule of 1 week off, 2 weeks on, 1 week off, 2 weeks on, 1 week off and 1 weeks on for the 10 weeks. A graduate student speech-language pathologist was assigned to plan, direct and work with the client for one hour twice a week for 10 weeks. A student researcher observed to document data and oversee progress. From this study, positive efficacy of sensory integration therapy was seen in direct relation to an increase in vocalization/verbalizatio