The eight articles in this volume reflect the increased tendency in recent years to consider problems of language acquisition and language pathology in the context of basic research and theory. They also reflect the two major approaches to language development: the transformational-linguistic approach which puts its emphasis on an innate biological component in language development, and the learning theory of approach which stresses the role of experience in language development. An introductory chapter by James H. Koplin outlines the aims and current status of applied psycholinguistics and is followed by a section on normal language processes which contains two articles: "Children's Development of Syntactic Control" by William J. Griffin, and "Research on Second-Language Learning" by Harlan L. Lane. The second section, devoted to language pathology, includes four papers: "Language Learning and Performance in the Deaf" by Richard L. Blanton; "Studies on the Grammar of Aphasics," Harold Goodglass; "Schizophrenic Language: A Disattention Interpretation," Rue L. Cromwell and Paul R. Dokecki; and "Environmental Factors and the Language Development of Retarded Children," Joseph E. Spradlin. The concluding chapter, by Sheldon Rosenberg, relates the articles to the major trends of theory and research in contemporary psycholinguistics. (DO)