Questions on AAC?
Here are some helpful resources:
American Speech and Hearing Association (ASHA)
Cough Drop AAC
PrAACtical AAC
Tobii Dynavox (Maker of TD Snap)
PRC Saltillo (Maker of TouchChat with WordPower)
AssistiveWare (Maker of Proloquo2Go)
Prentrom (Maker of LAMP WFL)