Different questionnaires assessing the usability of two multimodal systems and one unimodal system were compared. Each participant (N=21) performed several tasks with each device and was afterwards asked to rate the system by filling out different questionnaires. The results show that standardized questionnaires are applicable only to a limited extent. Despite some concordance, the results differ considerably and thus indicate the need for the development of a valid and reliable questionnaire covering the usability and quality of multimodal systems.
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