SSI-4: Stuttering Severity Instrument (Fourth Edition)

The Stuttering Severity Instrument (SSI-4) (Fourth Edition) measures stuttering severity in both children and adults. 

Ages: 2-10 and up
Testing Time: 15 to 20 minutes
Administration: Individual

The Stuttering Severity Instrument (SSI-4) is a reliable and valid norm-referenced stuttering assessment that can be used for both clinical and search purposes. It measures stuttering severity in both children and adults in the four areas of speech behavior:

1. Frequency
2. Duration
3. Physical concomitants
4. Naturalness of the individual’s speech

Frequency is expressed in percent syllables stuttered and converted to scale scores of 2-18. Duration is timed to the nearest one tenth of a second and converted to scale scores of 2-18. The four types of Physical Concomitants are and converted to scale scores of 0-20. The SSI-4 can also be used in conjunction with the Stuttering Prediction Instruments for Young Children (SPI).

SSI-4 Norms

SSI-4 was normed on a sample of 72 preschool-aged children, 139 school-aged children, and 60 adults. It has four components, each of which is used to assess and monitor the stuttering severity in both children and adults for clinical and research use: (1) Examiner’s Manual and Picture Plates, (2) Test Record and Frequency Computation Forms, and (3) Subjective Stuttering Scales.

The complete SSI-4 Kit Includes: 

• Examiner’s Manual and Picture Plates
• 50 Test Record and Frequency Computation Forms
• Sturdy storage box

©2009 • Previous Edition: #6720