In response to yesterday's tip, a reader reminded me of the importance of going back and asking the same person the same questions that they've been asked before.
There's always the chance that your interviewee will give different answers or remember more than they did the first time. You should mix up the old questions with new ones based on things you have learned in the meantime.
But for a variety of reasons a second or third response to the same question could easily bring about a response different from what you got the first time.
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