Usability can be used in different field. In Human-computer interaction and Computer science usability usually refers to the elegance and clarity with which the interaction with a Computer program Web site is designed.
We can rate the one by thinking learnability(How easy is for users to finish basic tasks the first time ? ), efficiency(how quickly can they perform? ), memorability(When users return to the design after a period of time, can they perform it again? ), errors(How many errors do users make, how severe are these errors, and how easily can they recover from the errors? ) and satisfaction(How pleasant is it to use the design? )
If the design have a good usability, it will have high revenues through increased sales, increased user efficiency , reduced development costs and support costs.
Usability have become requirement everyone need to concern in producing a good design. No matter how beautiful your design is, you will also need to take a concern on usability
http://en.wikipedia.org/wiki/Usability
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