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Usability definition

“the measure (or metric) by which you judge how easy it is for the user (not creator) to do the intended task…” ~ @DesignNathanael

“…within pre-defined knowledge of similiar systems; to include learning curves.” ~ @MarkRHancock

Wikipedia says: “Usability is the ease of use and learnability of a human-made object.”

The Encyclopædia Britannica appears to say nothing on the subject.

The Encyclopædia Galactica says “A matter discussed at great length by experts though seldom seen in reality owing to perceptions of cost, even though it just means watching people use a prototype of the product.”

“refers to the concept of how a system helps and guides the person along the task-journey to create an efficient flow and effective solution.” ~ @Wedge