Although prior approaches to achieving computer access may mention users? abilities, ability-based design makes ?ability? the focus of its approach. Ability-based design places emphasis on using everyday input devices like mice, touchpads, and trackballs in innovative ways, thereby lowering the common access barriers of cost, complexity, configuration, and maintenance. The presenter will describe how impairments that affect abilities may be placed on two spectra, namely ?duration? and ?source.? Seven principles of ability-based design will be presented and illustrated by specific projects from the AIM Research Group at the University of Washington

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