Information Technology Reference
In-Depth Information
the user's experience in finding an answer, or the quality of the answer
given.
2.
Time on task is helpful when you are concerned about how quickly users
can perform tasks with the product. You might look at the time it takes
to complete a task for all users, a subset of users, or the proportion of
users who can complete a task within a desired time limit.
3.
Errors are a useful measure based on the number of mistakes users make
while attempting to complete a task. A task might have a single error
opportunity or multiple error opportunities, and some types of errors
may be more important than others.
4.
Efficiency is a way of evaluating the amount of effort (cognitive and
physical) required to complete a task. Efficiency is often measured by
the number of steps or actions required to complete a task or by the
ratio of the task success rate to the average time per task.
5.
Learnability involves looking at how any efficiency metric changes over
time. Learnability is useful if you want to examine how and when users
reach proficiency in using a product.
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