noun – the fact of something being easy to use, or the degree to which it is easy to use

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Candidates must have extensive experience in website design and usability.

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Usability is a quality attribute that assesses how easy user interfaces are to use. The word "usability" also refers to methods for improving ease-of-use during the design process.

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Usability is defined by 5 quality components:

• 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 reestablish 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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