“With standard usability tests, investigators are usually able to answer ‘how’ performance is executed. For example, investigators record a user’s flow of behavior. However, the question of ‘why’ is often left only indirectly answered (e.g. by think aloud approaches) which can lead to faulty interpretations of data. The cognitive clinical interview can be used to attain direct answers to both how and why users perform tasks as they do.”
Link:
http://www.internettg.org/newsletter/aug00/article_clinical.html
