This paper describes a user study investigating the influence of expertise and efficiency on modality selection (speech vs. virtual keyboard) and perceived mental effort. Efficiency was varied in terms of interaction steps. The goal was to investigate if the number of necessary interaction steps determines the preference for a specific modality. It is shown that the threshold for changing the modality selection strategy is at three (experts) respectively four (novices) interaction steps.
Bibliographic reference. Wechsung, Ina / Schaffer, Stefan / Schleicher, Robert / Naumann, Anja / Möller, Sebastian (2010): "The influence of expertise and efficiency on modality selection strategies and perceived mental effort", In INTERSPEECH-2010, 1930-1933.