Read up on Aspergers. Aspergers is (as has been pointed out above) a form of high functioning ASD. The biggest difference is Aspies can usually function in some way in 'the real world': Autism is usually associated with below average IQ, where as Aspergers' have above average (where average is 95-105 ish)
Traits of Autism/Aspergers
Unable to read social situations that are ambiguous, or misreading them.
— Unable to understand another person's point of view.
— Socially inappropriate comments
— Not appreciating every one is different, so John is more easily offended that Dave.
Taking things literally.
Fixed routines - changing plans on the fly really throws them. This can be down to someone saying they misread a rule last time you played, and the proper way to play is...
These can all combine- Last time Someone said A, you said B, and it was ok, so EVERYTIME A is said B is the response, it can never be wrong.
Obsessions, ignoring everything outside of that - ie knowing everything about the car on the TV news, but missing the fact it is in a crater caused by an earthquake.
Lack of facial expression - a blank look waiting for the next emotion to turn up.
Repetative behaviour, including physical tics - such as rocking on the spot.
Over investing in certian things (see obssession and fixed routine)
If you want to see a Aspie turned up to 11, then Sheldon in Big Bang Theory.
Do the job in front of you.