• A clinical autism spectrum diagnosis by doctors or psychologists usually placed under the condition that a person suffers in several areas of life. A person may well be autistic, but because of their situation in life, talent and / or support of education, training, employers, friends, partners or other forms of support to cope well enough to get no clinical diagnosis. In this case, such a person may receive a diagnosis, if, after a possible loss of aid leads to an anomaly, so that doctors and therapists can justify a clinical diagnosis.
• The question of whether it is in autism or autism spectrum disorders a category or a dimension is unclear. There is literature on subclinical forms of autism, a chapter about “Autistic Echos” in the book “The shadow syndrome: Neurobiology and mild forms of mental disorders”. In research, the concept of a ‘Broad Autism Phenotypes examines’, such as autistic traits from parents of autistic children.
• Some other official (ICD-10/DSM-IV) and unofficial (not in ICD-10/DSM-IV) diagnoses are examined in relation to autism, such as Hyperlexia, nonverbal learning disability, dyspraxia, sensory integration disorder or linguistic-pragmatic disorder . The issue of these as a separate diagnosis, or rather as part of a broader autism spectrum may be seen is unclear.

The early childhood autism, Kanner’s syndrome and, most striking feature in addition to the behavioral abnormalities: due to the early occurrence of severely impaired speech, motor impairment only other disabilities, often hindered spiritually. Depending on the intellectual capacity of early childhood autism is further subdivided in Low, Intermediate and High Functioning Autism (LFA, IFA and HFA). As LFA in the English area of early childhood autism associated with mental retardation, referred to as HFA those with normal or above-average intelligence level. The distinction between HFA and Asperger’s syndrome following is not clear why the terms are sometimes also used synonymously.