Single word speech intelligibility was evaluated in three groups: apha
sia with apraxia of speech, aphasia with no apraxia of speech, and nor
mal controls. Intelligibility was significantly lower in the two aphas
ic groups compared with the normal group and intelligibility did not d
iffer significantly between the aphasia and apraxia of speech and the
aphasia only groups. Seventy per cent of the speakers with apraxia of
speech obtained intelligibility scores below the normal range and 80 %
of the speakers with aphasia only obtained intelligibility scores wit
hin the normal range. There was a moderate, but statistically nonsigni
ficant, correlation between intelligibility and severity of apraxia of
speech on an eight-point rating scale.