The Preschool Preposition Test (PPT), a receptive language test for children ages 3 to 5, is a brief simple gross developmental screening instrument still in research status. For 985 normal subjects the test shows a significant correlation of scores with age. Significant correlations have been obtained between PPT scores and raw scores on the Peabody Picture Vocabulary Test for normal children and for mentally retarded older children functioning at a preschool level. Findings of two small samples suggest a link between PPT scores and mothers' nurturant and verbal behavior. Test materials from the authors are available on loan to researchers. (Author)