General interaction expertise: an approach for sampling in usability testing of consumer products
HCI'07 Proceedings of the 12th international conference on Human-computer interaction: interaction design and usability
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The three main ingredients of usability test-real users, real tasks, and real products-are examined. Some additional elements that make the difference between a good usability test and a worthless one are discussed. These are purpose and attitude, time of testing, experimental control, and dependent measures. The necessity of usability testing is argued