The concept of frontiers as a way to complement the research on user needs and preferences with context-aware capabilities is presented. A frontier is then the fringe of space between two access modes. Several components were implemented in an Android testbed to check the usefulness of the concept in the selection of Assistive Technology enriched with environmental and device related information, that in the coarse grain are able to suggest a change in the access mode that improve the users' performance on their tasks using a smartphone.
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