addition, testing the fix so quickly allows the team to verify good fixes as
working and catch poor fixes and correct them. If desired the team can cal-
culate the likelihood that an issue has been fixed by calculating binomial
confidence intervals. The appropriate equations for binomial confidence
intervals can be found on the Web by searching for the words “binomial con-
fidence intervals” or in articles on the subject specifically for usability engi-
neering situations (Lewis, 1996). For example, if you have made a change
and subsequently run five participants without seeing an issue, you can use
binomial confidence intervals to calculate that you are now ...
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