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Related Experiment Video

Updated: May 4, 2026

Qualitative and Quantitative Validation of Tools with Rating Scales Aimed at Assessing the Quality of University Service-Learning
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The Work-ability Support Scale: evaluation of scoring accuracy and rater reliability.

Lynne Turner-Stokes1, Joanna Fadyl, Hilary Rose

  • 1Department of Palliative Care, Policy and Rehabilitation, School of Medicine, King's College London, London, UK, Lynne.turner-stokes@dial.pipex.com.

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Summary

The Work-ability Support Scale (WSS) demonstrates good reliability and scoring accuracy for assessing vocational ability and support needs in individuals with acquired disabilities. Further real-world testing is recommended.

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Area of Science:

  • Rehabilitation Medicine
  • Occupational Therapy
  • Psychometrics

Background:

  • Assessing vocational ability and support needs is crucial for individuals with acquired disabilities.
  • The Work-ability Support Scale (WSS) was developed to aid decision-making in vocational rehabilitation.
  • Evaluating the reliability and accuracy of new assessment tools is essential for their clinical utility.

Purpose of the Study:

  • To report the iterative development and evaluation of the Work-ability Support Scale (WSS).
  • To assess the inter- and intra-rater reliability and scoring accuracy of the WSS using vignettes.
  • To highlight the impact of different methodological approaches on reliability analysis.

Main Methods:

  • Six occupational therapists scored vignettes individually and in teams, with repeated blind scoring after one month.
  • Scoring accuracy was tested against a reference standard using intraclass correlation coefficients (ICCs) and linear-weighted kappas (kw).
  • Inter- and intra-rater reliability for individual and team scores were evaluated using two statistical methods.

Main Results:

  • High scoring accuracy was observed (ICCs 0.78-0.96) for both parts of the WSS.
  • Substantial to almost perfect agreement (kw ≥ 0.60) was found for most items, indicating good reliability.
  • Team rating showed marginal improvement for Part A; four items required manual adjustment based on identified issues.

Conclusions:

  • The vignette-based study indicates generally acceptable scoring accuracy and reliability for the WSS.
  • The findings support the WSS as a viable tool for vocational rehabilitation assessment.
  • Further validation of the WSS in real-life clinical settings is warranted.