Abstract
Currently, a lack of reliable methodologies for the design and evaluation of usable multimodal interfaces makes developing multimodal interaction systems a big challenge. In this paper, we present a usability framework to support the design and evaluation of multimodal interaction systems. First, elementary multimodal commands are elicited using traditional usability techniques. Next, based on the CARE (Complementarity, Assignment, Redundancy, and Equivalence) properties and the FSM (Finite State Machine) formalism, the original set of elementary commands is expanded to form a comprehensive set of multimodal commands. Finally, this new set of multimodal commands is evaluated in two ways: user-testing and error-robustness evaluation. This usability framework acts as a structured and general methodology both for the design and for the evaluation of multimodal interaction. We have implemented software tools and applied this methodology to the design of a multimodal mobile phone to illustrate the use and potential of the proposed framework.
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