Principal themes and issues in the study of language development, Martyn Barrett; Prelinguistic communication, Vasu Reddy; Infant speech perception; infant speech production, John Locke; phonological development, David Ingram; Early lexical development, Esther Dromi; Early syntactic development, Mike Tomasello; Later lexical development, Jeremy Anglin; Later syntactic development, Michael Maratsos; Conversational and discourse development, Catherine Snow; Bilingual language development, Suzanne Romaine; Sign language development, John Bonvillian; Specific language impairment, Paul Fletcher; Language development in atypical children with autism, Down's syndrome, William's syndrome and learning difficulties , Helen Tager-Flusberg; Language development in children with brain lesions: neurological specialization and plasticity in language development, Elizabeth Bates.