SERVAM for Autism is a parent training book out of Australia that has some excellent information to share. I have used their Expressive Skills Questionnaire (available in PDF online HERE) in my interview of parents and teachers of nonverbal and minimally verbal students with functional communication needs.
SERVAM stands for...
S - sensory processing
E - environmental change
R - routines and planned change
V - visual supports
A - autism-friendly communicationM - motivation
Visit the SERVAM website HERE.
Download SERVAM's current, free How-To on Visual Sequences for Autism (HERE)