The usability super star Jakob Nielsen points out that seemingly small number user group were almost as effective as a large group when it comes to identify usability problems in an interface. In my opinion there are other factors to consider when presenting usage tests that among other things requires a slightly larger group of users.

Jakob Nielsen is by many regarded as the worlds foremost usability expert, almost like a usability god father and founder of many of the practices used in todays usability. Through his site Useit.com and his Bi-weekly column the Alert box Jakob are spreading the world to an ever growing international audience.

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