Usability howto

Step-by-step guide for usability processes
Guía paso a paso del proceso de usabilidad

http://usability.gov/methods/process.html


Definition of Usability at usability.gov

• 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?