ROI Use = Improve Effectiveness
- Increase success rate, reduce user error
"In Jared Spool's study of 15 large commercial sites users could only find information 42% of the time even though were taken to the correct home page before they were given the test tasks." (Nielsen, October 1998)
- Increase efficiency/productivity (reduce time to complete task)
"Inadequate use of usability engineering methods in software development projects have been estimated to cost the US economy about $30 billion per year in lost productivity." (Landauer, 1995)
- Increase user satisfaction
"In a Gartner Group study, usability methods raised user satisfaction ratings for a system by 40%; when systems match user needs, satisfaction often improves dramatically." (Bias & Mayhew, 1994)
