Usability Testing

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I write a lot about the importance of confidence intervals and making the most of small sample sizes. Recently, Dean Barker, director of UX at Sage CRM read one of the articles on margins of error and sample sizes and said: "I understand there is variability with small samples but I'm having a hard time reconciling the numbers with my experience."   Math Dean was

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Whether you're conducting an early stage test of a prototype or late validation, these five tips can make any usability test more credible. The tips both temper skepticism about small samples and help you avoid overstating your findings. Count the number of users that experience each problem. Early testing is all about finding and fixing usability problems. But make those problem lists even more helpful

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A user-interface problem is anything in the code or design that inhibits a user from completing an intended action. Usability testing is best done in the formative stages of development to find these UI problems and generate quantifiably better designs. Usability testing also has a summative role at the end of development as validation when bugs and functional gaps have been addressed.  Most UI problems

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There has been a bit of an explosion in remote usability testing tools of late. Some of these companies also offer to recruit and provide you with users who are paid to take your usability test (Usertesting.com, Feedback Army and EasyUsability to name a few). These services allow for quick (almost immediate) feedback from users. Data is gathered quickly via the internet as users are

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Usability measurements involve human performance and because human behavior is inherently error prone, reaching the goal of 6σ isn't necessary to proclaim success. Manufacturing companies that are considered producing "high-quality" products are usually somewhere between 4σ and 5σ. The benchmarks and targets that we set in our tests will necessarily need to be more forgiving than in manufacturing. I prefer focusing on the movement of

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