Most managers must show dollar returns that justify the extra time it takes to incorporate usability methods into R&D. Many of those who are still new to usability resist changing their former development practices beyond lip service such as "oh, yes, do a usability test tomorrow when we have version one up and running." (Usability professionals will see the humor in this statement.) Luckily, many ROI estimates require only simple mathematical skills to make the point, as we'll see. No real statistics are necessary. But, following our demonstration below, we'll show how the normal ROI may be fuzzier than…
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