“a broad concept that refers to how easy it is for users to learn a system, how efficiently they can use it once they have learned to use it, and how pleasant it is to use.”

5 attributes of Usability:

1. Learnability: The user should be able to promptly start performing their tasks with the system.

2. Efficiency: Once the user has learned the system, a high level of productivity should be possible.

3. Memorability: The casual user should be able to return to the system after not having used it for some time, without having to relearn everything.

4. Errors: Users should not make many errors using the system, and if they do, they should be able to easily recover from them. Catastrophic errors should not occur.

5. Satisfaction: Users should like using the system and should be subjectively satisfied when using it. The system should be pleasant to use.

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