The fourth version of the Stuttering Severity Instrument (SSI-4) has been available since 2009. It has some modifications and new features which make it more appropriate at least for clinical practice, although further documentation is needed. The objective of the current research was to translate SSI-4 into Persian language and to discuss its relative and absolute reliability as well as its criterion validity for Persian adults who stutter (PWS). The authors aimed to study how the new subjective self-reports of the SSI-4 complement the stuttering severity score obtained from the SSI-3 or the SSI-4. The authors argued that the response of participants to the complementary self-report questions should also be considered in calculating their stuttering severity score.
Tahmeaebi, Neda, Shafie, Bijan, Karimi, Hamid, & Mazaheri, Masood. (2018). A Persian-version of the stuttering severity
instrument-version four (SSI-4): How the new additions to SSI-4 complement its stuttering severity score?, Journal of Communicatin Disorders, 74, 1-9.
[stuttering, stuttering severity, stutteirng severity instrument, validiy, reliability]