ACC: Assistive Technology
AAC is used by people who, some or all of the time, cannot rely on their speech. AAC incorporates the individual's full communication abilities and may include any existing speech or vocalizations, gestures, manual signs, and aided communication. AAC is truly multimodal, permitting individuals to use every mode possible to communicate. Over time, the use of AAC may change, although sometimes very slowly, and the AAC systems chosen today may not be the best systems tomorrow - American Speech-Language Hearing Associates (ASHA).