Web Design Usability.
Usability is a large part of the user experience and plays a major role in experiences that are effective and pleasant, but then human factors like science, psychology, information architecture and user-centered design principles also play major roles.
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?
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?