Phonological acquisition traditionally has been measured using constructs that focus on segments rather than the whole words. Findings from recent research have suggested whole-word productions be evaluated using measures such as phonological mean length of utterance (pMLU) and the proportion of whole-word proximity (PWP). These measures have been…

The adequacy of mean length of utterance (MLU) as a criterion for matching retarded and normally developing children was investigated. Six normally developing and four retarded subjects were matched on MLU. Although matched on MLU, these two groups of children demonstrated both quantitative and qualitative differences in their use of language.…

The variation of mean length of utterance, a linguistic measure, is explored among 50 normally developing three-, four-, and five-year-olds. It is suggested that mean length of utterance, as a measure of language status, is limited in differentiating language-impaired from normally developing children. (Author/SJL)