The first of two articles on play reviews the development of play in typically developing infants, toddlers, and young children, including Piaget's observations on the development of play; developmental play research following Piaget (research by Lunzer, Sinclair, Lezine, Lowe, Rosenblatt, Uzgiris and Hunt, Fenson and others, Watson and Fischer,…

A literature review identified behaviors representative of the normal stages of communication, cognition, and vocalization in children's prelinguistic period. Results were organized as a checklist for assessment of at-risk infants. The checklist is recommended for monitoring infant development, supplementing formal screenings and diagnostic tools,…

This monograph presents language factors related to bilingualism, to assist educators to distinguish normal phenomena due to bilingualism from symptoms of a handicapping condition. The first section, called "The Nature of Bilingualism," discusses the diversity of bilingual students and their dynamic use of two languages, focusing on simultaneous…