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In many situations, the only thing that matters is whether users can complete certain tasks within an acceptable amount of time. In many ways, the average is unimportant. The main goal is to minimize the number of users who need an excessive amount of time to complete a task. The main issue is determining what the threshold should be for any given task. One way is to perform the task yourself, keeping track of the time, and then double or triple that number.


Cover of Measuring the User Experience, 2nd Edition