For autism to be diagnosed, a child (or adult) must meet three criteria: 
they must show social impairment (such as failing to understanding other 
people's emotions), communication difficulties and non-social problems 
(such as repetitive behaviour and restricted interests - following a 
very rigid routine is a good example) . These traits, however, do not 
always go together. It is quite possible to have problems in one area 
alone: some parents and siblings of autistic people, indeed, show this.
...  what is unusual is when genes place people at one end of a 
continuum for all three.

http://www.timesonline.co.uk/tol/comment/columnists/guest_contributors/article3957913.ece



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