This paper explores a number of HCI research issues in the context of the Aphasia Project, a recently established project on the design of assistive technology for aphasic individuals. Key issues include the problems of achieving effective design and evaluation for a user population with an extremely high degree of variance, and user-centered design for a user population with significant communication impairments. We describe the Aphasia Project and our initial approaches to dealing with these issues. Similar issues arise in many areas of assistive technology, so we expect our paper to be of general interest to the research community.


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