Discourse samples across three sessions from 12 individuals with aphasia were analyzed for the stability of measures of word finding, informativeness, efficiency, and main concept production. A general measure of word finding difficulty in discourse was stable from session to session, but the distribution of individual categories of word finding errors changed across sessions for all but one participant. Measures of informativeness, efficiency, and main concept production were stable at the group level, but one participant varied markedly from session to session. Discussion considers the implications for clinical researchers investigating changes in word finding and discourse production
