Here are the 'official' US clinical criteria for Asperger's Syndrome (AS).
My 13 yr old son was diagnosed at age three and also has ADHD, sensory integration difficulties, epilepsy and other conditions all of which show up in people on the autism spectrum more than in others. With extensive work, he does well in a mainstream school, but will likely have to work around his AS for his whole life.
If you think you or someone close to you is on the autism spectrum, I urge you to arrange an evaluation with a neuropsychologist with experience in working with people on the spectrum. Then consider whether counseling or remedial services make sense. The good news is that a lot of money and research are currently being focussed on conditions on the autism spectrum. So there are lots of options and support groups, etc out there. There is also a recognition that there are lots of adults out there who did not have the advantage of early diagnosis; and there are programs designed to work with those people. One major focus now is early screening - even pre-natal screening - so that accommodations and support can be provided as early as possible.
Diagnostic Criteria for 299.80 Asperger's Disorder
[The following is from Diagnostic and Statistical Manual of Mental Disorders: DSM IV]
(I) Qualitative impairment in social interaction, as manifested by at least two of the following:
(A) marked impairments in the use of multiple nonverbal behaviors such as eye-to-eye gaze, facial expression, body posture, and gestures to regulate social interaction
(B) failure to develop peer relationships appropriate to developmental level
(C) a lack of spontaneous seeking to share enjoyment, interest or achievements with other people, (e.g.. by a lack of showing, bringing, or pointing out objects of interest to other people)
(D) lack of social or emotional reciprocity
(II) Restricted repetitive & stereotyped patterns of behavior, interests and activities, as manifested by at least one of the following:
(A) encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus
(B) apparently inflexible adherence to specific, nonfunctional routines or rituals
(C) stereotyped and repetitive motor mannerisms (e.g. hand or finger flapping or twisting, or complex whole-body movements)
(D) persistent preoccupation with parts of objects
(III) The disturbance causes clinically significant impairments in social, occupational, or other important areas of functioning.
(IV) There is no clinically significant general delay in language (E.G. single words used by age 2 years, communicative phrases used by age 3 years)
(V) There is no clinically significant delay in cognitive development or in the development of age-appropriate self help skills, adaptive behavior (other than in social interaction) and curiosity about the environment in childhood.
(VI) Criteria are not met for another specific Pervasive Developmental Disorder or Schizophrenia."