In this paper, we describe an opportunistic model for human- environment interaction. Such model is conceived to adapt the expressivity of a small lexicon of gestures through the use of generic functional gestures lower- ing the cognitive load on the user and reducing the system complexity. An interactive entity is modeled as a finite-state machine. A functional gesture is defined as the semantic meaning of an event that triggers a state transition and not as the movement to be performed. An interaction scenario has been de- signed in order to evaluate the features of the proposed model and to investigate how its application can enhance a post-WIMP human-environment interaction.
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