Applications, easy to learn, use. Practical.Novice User should be designed to be a simple, not complex.Experience User need function more effective help to work faster and better than before.- High speed of user task performance.- Low user error rate is designed to user is used correctly. The error to a minimum. If Error less is Usability. Good, User create error less.- User retention over time time User just use or after a time long past. Still remember to use. Or remember easily.- Subjective user satisfaction - personal preference. That happy feeling much in use.
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