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When you think of usability testing, do you think about working with someone for an hour or two, watching and listening as they do a series of short, discrete scenarios where there is a clear ending or a correct answer for each scenario? For most of us thats a typical usability test. Its the type of usability test assumed by the Common Industry Format (ISO/IEC 25062, see http://zing.ncsl.nist.gov/iusr/). Its the type being discussed for the CIF-Formative (Theofanos and Quesenbery, 2005). Its the type that the various CUE studies have focused on (see
Janice Redish (Tue,) studied this question.