F. Number of spontaneous utterances is the number of sentences that were generated through the use of individual words and phrases that have general application. G. Number of pre-stored utterances is the number of sentences that were not generated using individual words and phrases that have general application. H. Mean length of utterance in words is the average number of words in the sentences. I. Mean length of utterance in morphemes is the average number of morphemes in the sentences. A morpheme is a unit of meaning.
Some words have more than one morpheme.
J. Brown's stage is a language use rating based on normative data. K. Expected age range is the number of months of age at which this level of language use would occur under normal development. P. Number of errors by type is a list of errors that can be attributed to various causes. Of the above identified summary measures, communication rate, language representation method use, and frequency order word lists are among the most valued by AAC clinicians and consumers. In addition to the summary measures indicated above, other related reports provide value to the AAC clinical intervention and outcomes measurement processes.