Cost-Justifying Usability, 2nd Edition

tistical procedures, comparisons between different versions of the software or

against baselines are possible. I am not aware of any studies indicating whether

RUE manages to avoid the problem of positive skewness: Because it is known

that the product of any two distributions (whatever their underlying form) tends

to the normal, perhaps RUE does approximate a normal distribution. We will

have to see data to test this hypothesis. Anecdotal evidence has been reported

to indicate that for first-time users of desktop products an average RUE (using

the mean) of approximately 400% may be expected. However, we do not know

what a generally acceptable value of ...