What is the role of 'intelligibility ratings' in AOS evaluation?

• A. They measure only articulation accuracy
• B. They are not useful
• C. They predict employment outcomes
• D. They provide a global measure of functional communication impact and track changes with therapy

Answer: (D)

Intelligibility ratings capture how understandable a speaker’s speech is to a listener in everyday communication. In AOS evaluation, they provide a global view of how the motor speech disorder affects functional communication, not just how well individual sounds or sequences are produced. This makes them especially useful for tracking progress over time, because they reflect whether improvements in planning, timing, and coordination with therapy translate into clearer and more easily understood speech in real-life contexts.

They integrate multiple aspects that influence understandability—articulation precision, timing and rhythm, prosody, rate, and even fatigue or effort—so a listener’s overall impression is meaningful for daily communication. This holistic measure helps set goals, monitor meaningful change, and communicate progress to clients and caregivers. The ratings are not limited to articulation accuracy alone, and they aren’t meant to predict employment outcomes on their own; rather, they show the practical impact of therapy on how well someone can be understood.