Sorry, it took so long to get back on the difference.

ADD is Attention Defecit Disorder

ADHD Attention Defecit Hyper-Activity Disorder

ADHD combines the effects of ADD and the inability to control ones calm behavior. Many ADD kids are very civl, using an educational reference, it is just that they cannot concentrate on a subject matter long enough to absorb the material. ADHD is what most ppl think of when they think of ADD. ADHD is the kid that cant concentrate and he is wild as hell.

I guess a small technical difference but then again we are not very good at truly understanding the complex world we live in.