Within the subfields of linguistics, traditional approaches tend to examine different phenomena in isolation. As Stoel-Gammon (this issue) correctly states, there is little interaction between the subfields. However, for a more comprehensive understanding of language acquisition in general and, more specifically, lexical and phonological…

A model of language abilities in matrix form is described in which areas of language ability are defined in terms of the effects of receptive and expressive language processes on four linguistic levels: phonology, morphology, syntax, and semantics. (Author)