Voice interfaces can be used to meet some accessibility requirements for physically disabled users, but only if they address inherent usability problems, namely, the trade-off between user efficiency and ambiguity handling. This paper explores usability issues related to voice interfaces for complex GUIs. We present two user studies on a series of interface designs to support voice navigation within a complex business GUI, and discuss the findings as they relate to efficiency and ambiguity handling. We conclude by discussing future directions for this work, including the addition of data input capabilities, which will be necessary to provide a truly accessible solution.

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