SUMMARYMeasurement of workload using voice user interface systems is helpful for improving usability. We propose an evaluation method which performs the main task of listening and answering via voice and the subtask of pressing the keyboard responding to signs on the visual display simultaneously. Using this dual-task method, we can find the parts of the voice interface systems where the user experienced problems. These are the parts the developer must improve. Our experiments showed that the proposed method reflected the difference of task difficulties significantly.
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