State of the Art in AAC: A Systematic Review and Taxonomy

People with complex communication needs (CCNs) can use high-tech augmentative and alternative communication (AAC) devices and systems to compensate for communication difficulties. While many use AAC effectively, much research has highlighted challenges -- for instance, high rates of abandonment and solutions which are not appropriate for their end-users. Presently, we lack a detailed survey of this field to comprehend these shortcomings and understand how the accessibility community might direct its efforts to design more effective AAC. In response to this, we conduct a systematic review and taxonomy of high-tech AAC devices and interventions, reporting results from 562 articles identified in the ACM DL and SCOPUS databases. We provide a taxonomical overview of the current state of AAC devices -- e.g. their interaction modalities and characteristics. We describe the communities of focus explored, and the methodological approaches used. We contrast findings in the broader accessibility and HCI literature to delineate future avenues for exploration in light of the current taxonomy, offer a reassessment of the norms and incumbent research methodologies and present a discourse on the communities of focus for AAC and interventions.