Usability inspection is a set of usability evaluation methods where a usability evaluator inspects a user interface.
Usability inspection is in contrast to usability testing where the usability of the interface is evaluated by testing it in usability lab on real users and/or mock users. Usability inspections can generally be used early in the development process by evaluating prototypes user interface; this cannot be done using usability testing.
Usability inspection methods are generally considered to be cheaper to implement than testing on users.
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