Core77 has posted an excerpt from Interviewing Users.
From my introduction to the excerpt:
I’ve talked to a lot of practitioners about their own experiences in doing fieldwork and often they try to address challenges when they experience the symptoms, but that’s usually not the right time. Consider this analogy: if you have insomnia, the best solutions are not those that you roll out at 3am when you can’t sleep. To effectively counteract insomnia you have to make specific choices during the day, before you go to bed. Doing research with people is the same thing and ideally you approach this sort of work with a well-defined perspective that will inform all of the inevitable detailed, specific, tactical problem solving.