Doing usability testing is just one of the reasons you develop the user profile. However, the user profile should prove a useful tool for visualizing the person you want to be in the testing room so you can articulate the requirements and classifiers and use those to form screening questions. If you don't have a user profile that documents the characteristics of the target users you want to have in the usability test, go back to the beginning of this chapter to "Characterize Users."
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