I've just seen someone comment on a thread that 4 out of 5 of their DC are autistic. So many classroom assistants in every primary class. So many parents I talk to saying they have or are fighting to get a diagnosis for their DC. And yet no one I went to school with at primary or secondary level was ever diagnosed as autistic, nor did anyone do anything that suggested they were undiagnosed like hand flapping or inability to communicate normally. Various levels of intelligence and social ability obviously, but no one who was at the level of meltdowns and needing stringent routine etc. Is it environmental?