FWIW, this:

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I know I'm not a professional and too emotionally involved to be objective, but the medical description of ODD (Oppositional Defiant Disorder) fits him pretty well. I seriously doubt that he is autistic or has Aspergers, but he might be above average on the spectrum. He shows some signs of ADD, but not all of them.

describes my DD fairly well, although she is not having outbursts to speak of at school (occasionally becomes mildly emotional) and is socially liked. I am told that ODD is a very serious disorder, though, and that DD's behavior, while problematic, is not intense or oppositional ENOUGH to warrant it, even though the descriptions do sound rather like her. She has an anxiety/depression diagnosis.