Dialysis patients can only consume one liter of fluid and two grams of sodium each day. If they go over these limits, they can have serious health complications. Since up to 80 % of patients do not adhere to their fluid and sodium intake, we are developing a PDA application to assist dialysis patients in monitoring their nutritional allowances. In this paper, we give an overview of the interactive PDA application and describe our user-centered design process to create an interface for dialysis patients with varying visual acuity, literacy skills, and computer experience. Our preliminary studies suggest that dialysis patients can use PDAs, but the interface must not rely on stylus input, writing, or small icons for usability. We will use our results in designing low fidelity paper interface prototypes before implementing the interface on the PDA.
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