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An abstract of the thesis of Susan Coll Mitchell for the Master of Science in Speech Communication: Speech and Hearing Science, presented June 10, 1996. Title: A Study of the Correlation Between the Articulation Competence Index (ACI) and the Percentage of Words Understood in the Continuous Speech of 4and 5-Year-Olds of Varying Phonological Competence Intelligibility refers to how recognizable a speaker's words are to the listener. Severity, a broader but closely related concept, incorporates intelligibility, disability, and handicap. Many factors influence intelligibility, including speech sound production, voice, and prosody, as well as a number of linguistic and contextual factors. Clinicians and researchers in the field of speechlanguage pathology require accurate measures of intelligibility and severity to assess and describe communicative functioning and to measure change over time. Determining the most accurate and efficient measurement approaches has been the focus of recent attention in the field. This study was a preliminary investigation of the relationship between the Articulation Competence Index (ACI), a severity metric, and the percentage of words understood in continuous speech, the standard measure of intelligibility. Specifically, the study addressed the research question: 2 Is there a significant correlation between the Articulation Competence Index (ACI) and percentage of words understood in samples of continuous speech of 4and 5-year-olds with varying levels of phonological competence? Subjects were thirty 4and 5-year-olds from the Portland metropolitan area. Four listeners calculated percentage-of-words scores for each child's 100-word speech sample. These scores were compared to ACI scores calculated by the investigator for each of the samples. The data were analyzed using the Pearson productmoment correlation (Pearson£). A moderately strong correlation (£ = .71 to .81) was found between the ACI and percentage of words understood. Squaring the correlation coefficients resulted in values for £ 2 of .50 to .66, indicating that the ACI accounts for more than half the variability of continuous speech intelligibility. The results suggest that the ACI does reflect the intelligibility component of severity. However, concerns regarding methodology of this study, specifically the limited number of samples used in examining intraand inter-rater reliability, should be considered when evaluating the results. 3

A Study of the Correlation between the Articulation Competence Index (ACI) and the Percentage of Words Understood in the Continuous Speech of 4- and 5-year-olds of Varying Phonological Competence