Comment by indymike

There is an interrogation technique called Five Whys. I believe it was created by S. Toyoda, and was and very is effective in root cause analysis. The basic idea was to ask a question and follow up with "Why?" until an answer contained an alterable behavior... that answer would usually come with the fifth why. Once in a while I use it in a business meetings, and as long as the person who is being questioned doesn't get defensive or hostile, it is surprisingly effective.