AAC, in one page: the encyclopedic overview
Before arguing about any specific method, it helps to know what AAC actually is: a broad, well-established field covering every way people communicate when speech alone does not work.
The Wikipedia article defines AAC — augmentative and alternative communication — as the set of tools, strategies, and techniques used by people with significant speech or language impairments. It spans unaided methods like sign and gesture and aided methods ranging from picture boards to high-tech speech-generating devices.
AAC is used across a wide range of conditions: cerebral palsy, ALS, stroke, traumatic brain injury, developmental disability, and autism, among others. It is not a single product or program — it is a field.
What the page covers
The entry walks through the history of AAC from the 1950s onward, the distinction between aided and unaided systems, symbol sets like PCS and Blissymbols, access methods including direct selection and scanning, and the role of speech-language pathologists in assessment and implementation.
It also discusses outcomes research, the principle of presuming competence, and the importance of multi-modal communication — most AAC users use more than one method depending on partner, setting, and fatigue.
Why this matters for assisted communication
Letterboards, supported typing, and spelling-based methods sit inside this larger AAC landscape. Treating them as something exotic and separate obscures the fact that text-based AAC for people who can read and spell is a well-established branch of the field.
The disagreement is not whether AAC works — that is settled — but how to support motor and regulation challenges for users who need physical or coaching support to access it reliably.