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Language, Speech, and Hearing Services in Schools Vol.40 46-52 January 2009. doi:10.1044/0161-1461(2008/07-0082)
© American Speech-Language-Hearing Association
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Articles

Test–Retest Reliability of Independent Measures of Phonology in the Assessment of Toddlers' Speech

Sherrill R. Morris
Northern Illinois University, DeKalb

Contact author: Sherrill R. Morris, Northern Illinois University, Department of Allied Health and Communicative Disorders, DeKalb, IL 60115. E-mail: srmorris{at}niu.edu.

Purpose: The purpose of this study was to assess the temporal stability of 5 independent measures of phonological skill: phonetic inventory (initial, final), word shape, syllable structure level, and the index of phonetic complexity.

Method: Ten toddlers with typical development participated in two 20-min play sessions within a 1-week period. Test–retest reliability for each measure was determined.

Results: Syllable structure level and index of phonetic complexity achieved high test–retest reliability. Word-final phonetic inventory and word shape analyses had moderate but not significant reliability. Word-initial phonetic inventory was not reliable.

Discussion: Twenty-minute conversational speech samples were insufficient to obtain reliable results for all measures. Practitioners may want to obtain more extensive sampling when using a phonetic inventory for diagnosis or progress monitoring purposes. Reliable measures within the constraint of a 20-min session, syllable structure level and index of phonetic complexity provide summarized information concerning the phonetic and syllabic characteristics of a child's speech. Syllable structure level places less emphasis on accurate phonetic transcription, making it a good option for speech that is difficult to transcribe.

KEY WORDS: phonology, assessment, speech, child, toddler


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