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Within the field of ergonomics, the concepts of usability, user experience and accessibility have played an increasingly important role. The present paper examined the meaning of these concepts and their relationship to each other, which included an analysis of the definitions, methods, and typical outcome measures employed. Despite some concerns in the literature about the utility of usability, user experience and accessibility as umbrella terms, we provide arguments for their continued use. The article proposes how the three concepts and their different perspectives can be integrated. We propose the term 'interaction experience' (IX) as a higherlevel concept. Due to the multi-facetted nature of umbrella concepts, we suggest using spider charts as a means to report the results of evaluating artefacts with regard to usability, user experience and accessibility.

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Practitioners may use the present findings as a basis for deciding on whether and how to implement accessibility best.

The findings may encourage more practitioners to implement WCAG 2.0 for the benefit of users with disabilities and nondisabled users.