Wasn't that the whole basis of expert systems? You run into the same issue as anthropology, or any other field that rely on asking humans questions. There are three truths, the truth they tell you, the truth they believe, and the actual truth.
As a trivial example. If I'm creating a system to enter the letter a, and I ask you how many times you enter the letter a in an average hour of work, you're not going to give me an accurate answer, wheather you want to or not.
The classic example of the limits of expert systems was the development of flight assist programs. Pilots where unwilling / unable to accurately answer questions concerning their flight activities.
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