The acquisition of connective forms and the meaning relations between connected clauses in the development of complex sentences is described for four children from two to three years of age. The major results of the study include the developmental interactions between syntactic connectives and meaning relations, and between these interactions and the discourse environments in which they occurred. The first syntactic connective the children learned, and, was the most general: semantically, and was used to encode conjunction with all of the different conjunction meaning relations in the order Additive < Temporal < Causal < Adversative. Other connectives were semantically more specific, and were learned subsequently with different syntactic structures in the order Conjunction < Complementation < Relativization. These results are discussed in terms of FORM, relative linguistic complexity; CONTENT, the intersection of form with conceptual and semantic factors affecting acquisition; and USE, discourse cohesion.

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Infants' spontaneous play with objects was examined for evidence of developments in object knowledge in relation to the emergence of words and the single-word period in language development. Subjects were 7 girls and 7 boys, from different ethnic and economic backgrounds, who were studied longitudinally from 9 months to 26 months of age. Two types of displacements of objects in relation to one another were identified in the children's play: Separations and Constructions. The development of Constructions was associated with the emergence of words, and Constructions increased with age while Separations decreased. The development of Specific constructions, which account for knowledge of the particular properties of objects, was more strongly associated with a Vocabulary Spurt at the end of the single-word period than with chronological age. Despite the wide variation in the infants' ages when developments in language and play were reached, relations between achievements in the two domains were consistent among them, as confirmed with the Friedman test, p ≤ .001. The results are discussed in terms of the cognitive developments required for play with objects and saying words.

The purpose of this study was to determine whether three preschool children with autism or autistic-like behaviors would learn and generalize pretend play activities targeted at two different play levels-a developmentally appropriate (DA) level and an age appropriate (AA) level-differently. The children's readiness for the DA play level was assessed with the Developmental Play Assessment (DPA) instrument (Lifter, Edwards, Avery, Anderson, & Sulzer-Azaroff, 1968). We taught individual exemplars from the two different play levels one at a time, to each of the children, in a sequential treatments design. In contrast to the consistently acquired DA activities, the activities of the AA category apparently were more difficult, and in most cases, they were not acquired In addition, the children were less likely to generalize the AA skills to other activities or toys. The results are discussed in terms of (a) the importance of developmental considerations in selecting instructional objectives, and (b) the usefulness of directly teaching play activities to children with developmental disabilities.Play is regarded as the "work" of childhood, and accordingly serves several important functions in development. As children engage in play activities they leam about objects and events, leam language for talking about these objects and events, and develop a range of interactions with parents and peers (Garvey,

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