I my case all three opinions came from very highly recommended professionals. They each have a different bent to their specialization, but each are qualified to diagnose ADD, and not just from a simple questionnaire (I've seen the school versions).
My wife was running full throttle due to her issues with schooling from her childhood (more on that in my sitch). I beleive she was very consistent in her answers, she just kept fishing until she got the diagnosis she wanted (this also relates to her control issues).
And I'm not referring to amateurs playing doctor, but the doctors themselves. My point is that if there were a truly objective way of measuring these emotional and behavioral conditions, I think you would see a lot more consistency in the diagnosis. But there isn't, so they get to charge $100+/hour!
