What is Usability?
A measure of people's experience with a user interface. This concept can be applied to anything a user uses (Software or Hardware). Usability is about the user. It focuses on how to make the interface easier for people to use. Five essential criteria that make something usable: learnability, efficiency, memorability, error management, and satisfaction.
Learnability: How fast a user can accomplish the basic tasks on an interface they have never used before.
Efficiency: How fast a user can perform tasks after learning how to use the interface.
Memorability: If the user has used the interface before, can the user still remember it effectively after being away from it for a while?
Error Management: Reduces user errors, decreases severity of each error, and makes user recovery easy.
Satisfaction: How much did the user enjoy the interface? You can find out answers through subjective feedback.
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