Monday, April 03, 2006

How Many Users Make a Good Usability Test

A continuation of a much discussed topic ...

"Jacob Nielsen argues in his alertbox that five users are enough to detect 80% of all usability problems. On the other hand Christine Perfetti and Lori Landesman claim that eight people are not sufficient to discover all usability problems. So what is the answer to our question?

... So depending on the external factors the best result can be achieved by making a usability test with no more than ten people, in most cases closer to five."   continued ...   (Via WebProNews)

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