Description
Stuttering Severity Instrument–Fourth Edition (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 behaviour, these are:
1. Frequency
2. Duration
3. Physical concomitants
5. Naturalness of the individual’s speech
Frequency is expressed in per cent 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 converted to scale scores of 0-20. The SSI-4 can also be used in conjunction with the Stuttering Prediction Instruments for Young Children.
