The International Standards Office (ISO) standard 9241 (ISO 1994), provides a statement that provides some explanation of what is usability: “The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use.” This matches the aspirations of a Universal design approach to AT product and service development.
Although often associated with human Computer Interaction and service design, this term of evaluation is an umbrella term for under which a mixed methods approach may be applied. It is a user-centred approach that matches to design thinking and an evidence-based design process.
Key elements of usability evaluation include the review of:
- Effective intuitive use
- Enhanced performance
- Reduction in error
- End user satisfaction
Key methods to be used under this umbrella term that have been found to be useful in AT product and service design are:
- Needs requirement analysis
- Task analysis
- Focus groups
- Paired comparison
- Ranking or benchmarking
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