The study examined the effects of sensory integration therapy (SIT) on the language development of 15 developmentally delayed preschoolers and the effects of SIT in combination with language therapy. Results of pre- and post-tests using the Sequenced Inventory of Communication Development, and Peabody Picture Vocabulary Test-Revised, and the Mean Length of Utterance; and samples of communicative interactions during free play were analyzed. SIT emphasized tactile discrimination, goal-directed vestibular activities, and reflex integration. Language therapy (LT) stressed expressive and receptive language learning activities equally. Analysis revealed that SIT and its interaction with LT were both generally implicated in language gains made by Ss, and in some cases were statistically significant at moderate levels. (CL)