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User-Centered Formative Evaluation of Cognitive Rehabilitation Software: Cognitive Walkthrough and System Usability

Seojin Hong1, Hyun Choi1, Hyosun Kweon1

  • 1National Rehabilitation Center, Seoul, Gangbuk-gu, Republic of Korea.

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Summary

This study evaluated tablet-based cognitive rehabilitation software, identifying 14 usability issues and suggesting improvements for safer digital interventions. The formative evaluation used cognitive walkthrough (CW) and System Usability Scale (SUS) to enhance user experience.

Keywords:
IEC 62366-1System Usability Scalecognitive rehabilitation softwarecognitive walkthroughformative evaluationhuman factorsusability evaluation

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Area of Science:

  • Human-Computer Interaction
  • Medical Device Software
  • Digital Health

Background:

  • Usability of medical device software is crucial for patient safety and treatment effectiveness.
  • Poor usability in cognitive rehabilitation software can lead to errors, cognitive overload, and reduced therapeutic outcomes.
  • Few studies have systematically evaluated cognitive rehabilitation software usability using human factors methods.

Purpose of the Study:

  • To conduct a formative evaluation of tablet-based cognitive rehabilitation software.
  • To identify potential user errors and interface design issues.
  • To find opportunities for improving user experience and user interface (UI).

Main Methods:

  • Employed the IEC 62366-1 framework for usability engineering.
  • Utilized cognitive walkthrough (CW) for expert evaluation of use-related problems.
  • Administered the System Usability Scale (SUS) for quantitative usability assessment with 5 occupational therapists.

Main Results:

  • Identified 14 usability issues across 6 task scenarios, including button location and feedback.
  • Key improvement areas: keypad layout, task progress visibility, and help content accessibility.
  • Achieved a mean SUS score of 73.5 (acceptable usability, grade B-), with lower scores for system complexity.

Conclusions:

  • Combined CW and SUS effectively identified usability challenges in cognitive rehabilitation software.
  • Emphasized user-centered design and formative evaluation for safer, more effective digital interventions.
  • Highlighted the practical application of IEC 62366-1 for iterative UI improvements in cognitive rehabilitation.