One of my best friends has 2 ADD kids. I can truthfully say, been there done that. Three of us have tried it and it really does help, not cure, but help. You help your child know when to slow down and stop by using numbers 1-10 or a stoplight, according to how old they are.
Younger kids use the stoplight.
Red means stop immediatlely or you're out of control. Green means GO or play away. It works great in the stores,when you don't want a big scene. You just ask them what light they're on and what light should they be on. Then you tell them what light you want them on.