| Overall Assessment of the Speaker's Experience of Stuttering (OASES) | Multidomain impact of stuttering across general information, reactions to stuttering, communication in daily situations, and quality of life. | Captures change in the speaker's overall stuttering experience, including reactions, daily communication, and quality of life; an intervention trial reported improvement in the total score and all four components. | Not a direct fluency or stutter-count measure. Do not use it as the only outcome when the referral question is strictly speech frequency, and pair it with a speech sample measure when both frequency and impact matter. |
| Wright & Ayre Stuttering Self-Rating Profile (WASSP) | Self-rated impact across stuttering behaviours, thoughts about stuttering, feelings about stuttering, avoidance, and disadvantages. | The avoidance and disadvantage domains map closely onto participation goals, so it gives a place to record movement toward things like joining a conversation or asking someone to coffee. | Self-rating format means it reflects the client's perspective only. Pair it with an observed sample when documentation requires an outside observation. |
| Percent syllables stuttered (%SS) | The proportion of spoken syllables containing an unambiguous stuttering moment. | Provides a direct stutter-count index of speech-sample frequency and can serve as a component of more comprehensive severity measures. | In isolation it does not help the individual judge whether intervention worked. Do not use it as the sole outcome when participation, reactions, communication, or quality of life are treatment goals; it describes the speech event, not whether the client now asks someone to coffee. |
| Stuttering Severity Instrument, Fourth Edition (SSI-4) | Frequency (%SS), duration (average length of the three longest stuttering events), and physical concomitants, combined into a severity score. | Produces a composite single-number severity index that incorporates %SS, duration of the three longest moments, verbal and nonverbal superfluous behaviours, and speech naturalness; more detailed than %SS alone. | Reported limitations include being time-consuming and unreliable in some comparisons. It measures observable severity rather than the speaker's participation or quality-of-life experience. |
| Satisfaction With Life Scale (SWLS) | Global satisfaction with life. | A published intervention outcome used alongside the OASES; a randomized trial reported improvement in satisfaction with life after intervention. | A global life-satisfaction measure rather than a stuttering-specific instrument. Use it as a complementary distal outcome, not a replacement for stuttering impact or participation measures. |
| Kemp Quality of Life Scale | Overall quality of life in adults who stutter. | A published quality-of-life scale used in stuttering research with adults who stutter. | Assesses overall quality of life, so pair it with stuttering-specific impact and speech measures when those mechanisms are the point of the intervention. |