– Time to learn
How long does it take for typical members of the community to learn
1-15
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relevant task?
– Speed of performance
How long does it take to perform relevant benchmarks?
– Rate of errors by users
How many and what kinds of errors are made during benchmark tasks?
– Retention over time
Frequency of use and ease of learning help make for better user
retention
– Subjective satisfaction
Allow for user feedback via interviews, free-form comments and
satisfaction scales