Cost-Justifying Usability, 2nd Edition

In fact, if you had made the more aggressive, yet still realistic, benefits

assumptions of training time reduced by 20 hours (rather than by 10), two errors

eliminated per user per day (rather than just 1), and task time reduced by 15

seconds (rather than just by 5 seconds), the benefits would have added up to

$903,839.58 in the first year alone, outweighing the costs of $225,925 by

$677,914.58, and to $3,683,197.92 over 5 years, outweighing the costs by

$3,457,272.90. Thus, you could argue, even the most conservative assumptions

predict a fairly dramatic payoff of a comprehensive usability engineering

program, but the likelihood is that the payoff will ...