Research on childrens language impairments has provided valuable insights into the factors that are important for normal language acquisition. In particular, research on Specific Language Impairment has investigated dysfunction in cognitive, perceptual, social, environmental and developmental areas that impact on normal language development. Until recently however, many of these factors have been investigated in isolation in clinical samples. Therefore, despite suggestions that the factors are important for normal language acquisition this hasnt been fully investigated in a normal sample of...