Usability Evaluation of Multimodal Interfaces: Is the Whole the Sum of Its Parts?

Authors:
Ina Wechsung;Klaus-Peter Engelbrecht;Stefan Schaffer;Julia Seebode;Florian Metze;Sebastian Möller
Affiliations:
Deutsche Telekom Laboratories, TU Berlin, Berlin 10587;Deutsche Telekom Laboratories, TU Berlin, Berlin 10587;Deutsche Telekom Laboratories, TU Berlin, Berlin 10587;Deutsche Telekom Laboratories, TU Berlin, Berlin 10587;InterACT center, Carnegie Mellon University, Pittsburgh,;Deutsche Telekom Laboratories, TU Berlin, Berlin 10587
Venue:
Proceedings of the 13th International Conference on Human-Computer Interaction. Part II: Novel Interaction Methods and Techniques
Year:
2009

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Abstract

Usability evaluation of multimodal systems is a complex issue. Multimodal systems provide multiple channels to communicate with the system. Thus, the single modalities as well as their combination have to be taken into account. This paper aims to investigate how ratings of single modalities relate to the ratings of their combination. Therefore a usability evaluation study was conducted testing an information system in two unimodal versions and one multimodal version. Multiple linear regression showed that for overall and global judgments ratings of the single modalities are very good predictors for the ratings of the multimodal system. For separate usability aspects (e.g. hedonic qualities) the prediction was less accurate.