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On the appropriate use of focus groups and usability testing in planning and evaluating Interfaces (08 Oct 2004)
Usability practitioners don't do focus groups because typically they are no brought in early enough in the development cycle. Instead, the input of the usability group is solicited only after the commitments to functionality are made and the development is in progress. At that point the usefulness of focus groups has faded. Alternately, we are asked to evaluate and enhance existing interfaces. This requires evaluating and improving. Not innovating.
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