Jakob Nielsen aand Ben Shneiderman has correlated usability to usefulness. There are 5 aspects of usability, i.e. Efficiency, Learnability, Satisfaction, Memorability, and Errors.
Efficiency: How quickly can the users perform tasks after learning?
Learnability: How easy is it for users to learn to accomplish basic tasks?
Satisfaction: How pleasant is it to use the user interface?
Memorability: When users return to using the user interface after a period of time, how easily can they remember how to use it?
Errors: How many errors do users make? How severe are these errors? How easily can they recover from the errors?
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