8. The method of claim 1 , wherein using the distribution in an age-based model to assess the child's language development comprises computing a developmental age for the key child.
8. The method of claim 1 , wherein using the distribution in an age-based model to assess the child's language development comprises computing a developmental age for the key child. 9. The method of claim 8 , further comprising using the developmental age for the key child to determine an estimated mean length of utterance for the child.