interviews are not always a reliable way of getting information. The interviewee might just end up telling the interviewer what they think they want to hear.
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it gets them reliable results.
result
because it is so very reliable
When properly set up and run, yes, they are reliable.
Faulty conclusions may be drawn when they're based upon too few facts or observations. In science, a conclusion is arrived at after a careful search for available, reliable information. That information is dependable when it's based on the careful trial and error recording of experiments, interviews and observations.