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For more on dealing with this, see ~Chapter N, Piloting A Test Checking for technical problems in Chapter 10.
Testing in person
If you’re testing on paper, or doing an online test face-to-face with a participant (see ~ for reasons why you would want to do this), then the “where” becomes important.
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For more on hosting user-research sessions, see ~web resource or UT book.
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Next: Who will do what?