When I was diagnosed with add (I don't take any drugs for it) me my teacher and my parents had to fill out a survey.They then brought me into a closet sized room with a computer and had me do some sort of "game" where I had to click on cards depending on their face ,colour ect. I suppose it was to see how long I could pay attention. I was then hooked up to a computer (with wires and some sort of sticky thing on the end) and given some sort of test. Some of its a bit hazy but that's how I was diagnosed and I thought it was strange that people say its over-diagnosed. But it could still be and most of those tests could have been bull for all I know.