Parent report has proven a valid and cost-effective means of evaluating early child language. Norming datasets for these instruments, which provide the basis for standardized comparisons of individual children to a population, can also be used to derive norms for the acquisition of individual words in production and comprehension and also early…

Analysis and comparison of three independent transcriptions of the same speech sample collected from a hearing child with deaf parents resulted in two descriptions of the child's phonological system--one based on a liberal estimate and the other a conservative estimate of the potential error in the transcripts. (Author/CB)

Six children were studied from the age of 6 months to 1 year and 6 months to chart their developing comprehension vocabularies from the first to the 100th word. Observational data were used in the first instance to identify newly comprehended words and then controlled testing was carried out for each word to confirm and expand the observational…