Usability

2. USABILITY Attention to usability doubles desired business metrics Nielsen Norman Group

6. User testing How: User testing is the fastest and easiest method in the usability engineering toolbox Multiple rounds of testing and redesign are required to achieve acceptable user-experience quality It is much cheaper to fix problems discovered early in the project rather than at its end In real projects, not much testing takes place The lack of test-readiness means that testing happens, at best, once per project Single-test projects invariably defer usability testing until the complete design is available Issues Facts

9. Source: http://www.useit.com/alertbox/20000319.html Why You Only Need to Test with 5 Users Found 15 representative users? Use them in 3 tests with 5 users each.