This research is a direct answer to a need that has been shown within the field of speech pathology. In order to assess their patients' skills and to follow their progress over time, speech pathologists need reliable and valid methods for quantifying communicative performance. Today speech intelligibility tests are the most widely used tools for this purpose.Despite this fact, few authors have studied the relationship between speech intelligibility scores and a patient's ability to be understood by others (Beukelman, 1979 ; Hustad, 2008). Our research work directly builds on these previous studies. We created a method to assess speech comprehension by observing the listener's reactions to speech. This method — implemented in a software program called ‘EloKanz‘ — allowed us to study the relationship between speech intelligibility and speech comprehension in a more precise manner.Our results show that speech intelligibility scores are not valid predictors of communicative performance. Clinical implications matter greatly, since speech intelligibility scores are used not only to evaluate the effectiveness of speech therapies and treatments, but also to make enrollment or dismissal decisions.
