OASES: Overall Assessment of the Speaker’s Experience of Stuttering


The Overall Assessment of the Speaker’s Experience of Stuttering (OASES) is a quick, easy-to-use, comprehensive tool for measuring the impact of stuttering on a person’s life. OASES Impact Scores and Impact Ratings can help you qualify individuals for research or therapy, make treatment decisions, justify third-party payment and evaluate treatment efficacy.



NB: Only available to clients based in the Republic of Ireland – qualification criteria apply (see qualification code and link below)

Ages: 7-18+
Testing Time: 15 to 20 minutes
Administration: Individual
Qualification Code: A – Click HERE for more details.

Measure the impact of stuttering with this quick, easy-to-use, comprehensive tool. Evidence-based and founded upon a solid theoretical framework, the OASES protocol supports clinical and research decision-making. OASES Impact Scores and Impact Ratings help you provide diagnoses, qualify individuals for therapy, justify third-party payment, document improvement, and evaluate treatment efficacy.

Uses & Applications:

  • Gather valuable background data during assessment to support treatment recommendations and justify intervention
  • Build the therapeutic alliance by discussing items and scores with clients throughout treatment
  • Document progress and make data-based treatment decisions through ongoing assessment and planning
  • Assess outcomes during and after treatment to evaluate efficacy and recommend appropriate follow-up
  • Evaluate changes that occur due to treatment in efficacy studies

Content & Administration:

Each question is scored on a 5-point Likert scale. Responses are totaled into Impact Scores and Impact Ratings (Mild through Severe). Scoring can be completed for the entire test, as well as for each of the four sections individually. These sections examine:

  • General information about the speaker’s perceptions of stuttering
  • The speaker’s reactions to stuttering
  • Difficulties with communication in daily situations
  • Overall impact on quality of life

OASES Age Groups:

OASES Response Forms have been developed and validated, with age-appropriate items and instructions for 3 age groups:

  • OASES-S: School-Age Children (ages 7-12; 60 items)
  • OASES-T: Teens (ages 13-17; 80 items)
  • OASES-A: Adults (ages 18 and above; 100 items)

Features & Benefits:

  • Provides a quick and easy self-assessment that forms the foundation of a comprehensive evaluation
  • Enables insights beyond observable stuttering severity ratings
  • Helps clinicians and clients understand the complexity of stuttering
  • Offers information about the speaker’s perceptions about stuttering, the speaker’s reactions to stuttering, and challenges in performing daily activities that involve communication
  • Examines functional communication difficulties and quality of life from the perspective of those who stutter
  • Promotes self-awareness of how stuttering affects different areas of life, including school, work, home, and social settings
  • Provides useful information that researchers can use for evaluating the efficacy of stuttering treatment

Psychometric Data and Validation:

  • Based on an adaptation of the World Health Organization’s International Classification of Functioning, Disability, and Health (Yaruss & Quesal, 2004)
  • Validated through samples of hundreds of people who stutter drawn from around the world
  • Supported by numerous peer-reviewed empirical studies
  • Provides both a numerical score and descriptive impact rating

Additional information

Age Suitability:



OASES Technical/Scoring Manual, Pack of 25 Response Forms of each: OASES-S (Age: 7-12), OASES-T (Age: 13-17) & OASES-A (Age: 18+)



Publication Year:


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