Inclusive design and usability testing: Involving an end-user in developing augmentative and alternative communication user interfaces using an open-source platform.

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Traditionally, augmentative and alternative communication (AAC) user interface development has been a time-intensive process requiring expertise in software development, often excluding people who use AAC. This paper demonstrates the involvement of an end user in the design and testing of prototype AAC user interfaces (UIs) developed using a platform called the Open Source Design and Programmer Interface (OS-DPI). Micro-analysis of in-person conversation involving an adult with intellectual and developmental disabilities who uses AAC revealed several problems related to accessing his aided AAC device. The OS-DPI was used to co-design, develop, and test UIs aimed at addressing these observed problems. Researcher efforts to independently design and develop novel UIs that addressed the problems identified in research were ineffective. Inclusive design practices led to a shared determination of required functionality and co-design of UIs with reported improvements for access and communication. This paper demonstrates the potential of the OS-DPI for the co-design and development of AAC UIs to address unique needs.