AAC is used by people who have difficulty producing oral speech due to speech or language deficits. AAC can help people augment or supplement their communication, or serve as an alternative to their communication.
Those who utilize AAC may use it temporarily or long-term, depending on individual circumstances.
Examples of individuals who use AAC include those with:
autism spectrum disorders (ASDs)
apraxia & dyspraxia
traumatic brain injury (TBI)
This list includes many common causes for using AAC, however, it is not all-inclusive; there can be many reasons to use AAC. The important thing to remember is if you or someone you know is having difficulty communicating for whatever reason, AAC may likely be beneficial.
The user shouldn't prove he can use AAC
There are no skills a child must have in order to be considered a candidate for an AAC device. In fact, AAC can actually help a child learn those skills faster. We use technology to teach the language/concepts.
Communication is a human right and everyone must have access to it.