Interaction design reaches deep into a product. It explicates system constraints, supports user goals and tasks, facilitates cognition, enables perception, and requires human action. The resulting user experience also extends beyond skin deep: It directly involves human musculoskeletal and nervous systems. As such, it can do them damage. We rely on "official standards," such as the definition of usability from ISO 9241, Part 11: "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." But how easily can we test such usability?…
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