Absol-bloodly-lutely. Extremely well put. It extends beyond education and learning mechanisms too, in my view.

[Dunx and Raak] Hear hear. Nicely expressed.

As Raak says, a leg is generally broken or not broken, and the difference is pretty clear and agreed upon, but you get members of any minority group into a room (ADD sufferers, autists, gays, black people) into a room and ask them to define "ADD", "autism" or, heaven help you, "gayness" or "blackness" and you will soon have a heated debate on your hands.

...just witness the endless controversies in the last few decades over the definition and meaning of "disabled".

I agree with Dunx that the problem is really one of society not being able to handle people who are different. It's terrible that children, in particular, who have a different way of learning, get straitjacketed into the traditional methods and classed as having a problem if they don't fit in. It's especially ridiculous given how much society actually prizes ADD traits in many ways - such as creativity and spontaneity - which is how people like Billy Connolly, Robin Williams, and Ozzy Osbourne got to where they are today. Bill Clinton, of course, is the classic ADD kid made good. But at the same time, I do think that there is good evidence that ADD, in particular, is a discrete and specific disorder, with specific physiological causes, rather than a handy name for a bunch of sometimes associated phenomena. Raak is wrong to say that the genetic correlations of ADD are vague: they are not vague at all, and there is very good evidence for a strictly physiological basis, although of course how that basis manifests itself will vary according to conditions. Certainly ADD behaviours do vary from person to person in type and degree, which is one of the things that make it hard to diagnose, but it doesn't follow that the underlying cause varies - at least where ADD is the correct diagnosis. We have a rather skewed view of it in the UK because, as he says, it hasn't been officially recognised here for very long, compared to the US; in fact, some of the newer treatments for it, such as Concerta (essentially slow-release Ritalin) are unheard of to many supposed experts in this country. Plus, of course, the media like to fixate on issues of medication and horror stories about it. By the same token, it would be better if society could change to accommodate those of us who are different, but given that it can't, medication is a whole lot better than nothing. I have known people whose lives have been utterly ruined by ADD as well as by OCD. If they had been diagnosed earlier and given the help they needed - medication as well as proper counselling and behavioural therapy - who knows how things might have been different.