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usability

Usability is a measure of the quality of a person’s experience in interacting with content or services.

Initially a discipline focused on computer software development, usability also relates to website design and is evaluated in terms of:

Ease of learning
How fast can a user who has never seen the user interface before learn it sufficiently well to accomplish basic tasks?
Efficiency of use
Once an experienced user has learned to use the system, how fast can he or she accomplish tasks?
Memorability
If a user has used the system before, can he or she remember enough to use it effectively the next time or does the user have to start over again learning everything?
Error frequency and severity
How often do users make errors while using the system, how serious are these errors, and how do users recover from these errors?
Subjective satisfaction
How much does the user like using the system?

Source: Usability basics (usability.gov)

Website usability

In the context of website design, the quality of the user experience is typically discussed in terms of:

Related terms: (web) accessibility, GUI, information foraging, interface, perceived affordance.

 

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