“The debate rages. “Formal usability testing costs too much,” says one side. “We need methodological rigor,” maintains the other. “You can find the important problems with just five users,” insists the first. “Such a small number doesn’t give us reliable results,” counters the second.And never the twain shall meet.Or will they? In this Whiteboard, Jeff Sauro explores the issues and gives us some ideas for maintaining the statistical validity of our usability testing as we reduce its costs.”

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