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In this paper, we present a novel methodology to assess the accessibility and usability of Graphical User Interfaces (GUIs) using virtual user models to describe the users' cognitive capacities and applying these models in simulated interaction with virtual prototypes of ICT products' UIs. We have implemented two tools, to facilitate GUI accessibility assessment: VerSEd-GUI, which supports the creation of custom GUI interaction scenario sequences in an implementation-agnostic manner and VerSim-GUI, for the simulated reproduction of these interactions by virtual users with cognitive impairments. Using these tools, we create a holistic methodology to assess the cognitive accessibility of GUIs.
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