In the early years of the "Journal of Child Language," there was considerable disagreement about the role of language input or adult-child interaction in children's language acquisition. The view that quantity and quality of input to language-learning children is relevant to their language development has now become widely accepted as a…

The established unit for reporting sociolinguistic data has been the sociologically determined group. Characteristically, only the mean rate of nonstandard usage for the group is reported for any linguistic feature. Such reporting obscures the possibility of linguistic heterogeneity within the group. Data from Los Angeles school children show that…