Augmentative/alternative communication systems (AAC) involve the use of personalized methods or devices to supplement a person’s ability to communicate. There are many types and methods of AAC and most individuals use a combination of systems/devices depending on the communication situation.
Unaided AAC systems are those that require no additional pieces of equipment. These include manual signing, gestures, facial, expressions, pantomime, pointing, and/or eye gaze
Aided AAC systems include some kind of external device, and can include a wide variety of methods ranging from no tech/low tech to high tech. Aided AAC systems generally involve devices that display symbols a person selects to convey messages to listeners.