Dr. Volkmar describes the tests used to diagnose Asperger's syndrome.
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Although Asperger’s disorder was described a year after infantile autism, or Kanner’s syndrome, interestingly, there has been much less work, not surprisingly, I guess, because Asperger’s is only recently recognized as an official diagnosis. There are a number of instruments used for a screening. I think the state of the science is much less well developed for Asperger’s than it is for autism.