Monthly Archives: May 2011


Usability differs from user satisfaction insofar as the former also embraces usefulness
More efficient to use—takes less time to accomplish a particular task
Easier to learn—operation can be learned by observing the object
More satisfying to use
Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
Efficiency: Once users have learned the design, how quickly can they perform tasks?
Memorability: When users return to the design after a period of not using it, how easily can they re establish proficiency?
Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors?
Satisfaction: How pleasant is it to use the design?


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