And how many kids did you know at school who were drooling, rocking back and forth, unable to speak, climbing the walls, hitting and spitting. Were they all really misdiagnosed (the answer is a simple NO, because the rates of MR and other 'misdiagnoses' have stayed more or less the same over the decade, ie have not fallen). Were all those kids in special schools? (again records show that wasn't the case). What you describe is Asperger's or a very mild end of the spectrum. Those previously missed cases could account for the some of the increase, but in no way explain all of it. Quality studies are clear on that, ie taking into account milder and moderate/severe forms. Bottom line is that you in no way could EVER miss a moderately affected child (let alone a severe one), for the simple reason that such a child could never go through educational system unaided. And better diagnosis of mild cases simply does not account for the increase. Go figure.