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Given the rise of individuals who have complex communication needs (CCN), it is important to identify appropriate assistive technology systems that can support the individual's communication needs. Augmentative and alternative communication (AAC) systems can serve as a means to assist individuals to communicate independently. The goal of AAC is to enhance or replace the individual's current and limited verbal or written communication skills. This chapter focuses on feature matching, aided communication and the selection process for aided communication systems including low to high technology systems. It also emphasises other key considerations pertaining to person-centred planning such as conducting preference assessments and trial periods to minimise system abandonment.