Process / pipelinestuttering severity & speech fluency
Stuttering Severity Instrument–Fourth Edition
The Stuttering Severity Instrument–Fourth Edition (SSI-4) is the standard clinician-administered measure of stuttering severity in children (ages 2–13) and adults (ages 14–75). Developed by Riley (2009), SSI-4 quantifies stuttering through three behavioral components: frequency (percentage of syllables stuttered), duration (average length of stuttering moments), and physical concomitants (observable tension and associated movements). SSI-4 Severity Scores enable reliable tracking of treatment response, prognosis estimation, and comparison across populations, making it essential for evidence-based stuttering assessment and research.
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Sources
- Riley, G. D. (2009). Stuttering Severity Instrument for Children and Adults–Fourth Edition (SSI-4). Austin, TX: Pro-Ed Publications. ISBN: 978-1-59820-072-7
- Riley, G. D., & Riley, J. (1994). The Stuttering Severity Instrument for Children and Adults–Third Edition: A Revised Assessment Tool. Seminars in Speech and Language, 15(3), 196–201. DOI: 10.1055/s-2008-1064120 ↗
- Beilby, J. M., Byrnes, M. L., & Yaruss, J. S. (2012). Acceptance and Commitment Therapy for Adolescents Who Stutter. Journal of Fluency Disorders, 37(4), 290–299. DOI: 10.1016/j.jfludis.2012.06.001 ↗