In this paper, we describe why designers need to look beyond the twin aims of designing for the 'typical' user and designing "prostheses." Making accessible interfaces for older people is a unique but many faceted challenge. Effective applications and interface design needs to address the dynamic diversity of the human species. We introduce a new design paradigm, Design for Dynamic Diversity, and a methodology to assist its achievement, User Sensitive Inclusive Design.
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Gregor et al. (2001) studied this question.