Gabrielle Hogg is an autisticadvocate and AAC user based in New Zealand. She blogs over at [AutismoGirl], post Facebook, and also is on twitter.
A few years ago we co-developed a one page handout to help psychologists, counsellors, and other clinicians support autistic people and those who use AAC part or full time.
There are many standard practices that work well for neurotypical people that can be challenging for autistic people, people with language disorders, or those with other communication impairments.