By Ina Wechsung
This publication provides (1) an exhaustive and empirically verified taxonomy of caliber features of multimodal interplay in addition to respective size tools, (2) a confirmed questionnaire in particular adapted to the assessment of multimodal platforms and overlaying lots of the taxonomy‘s caliber facets, (3) insights on how the standard perceptions of multimodal platforms relate to the standard perceptions of its person parts, (4) a collection of empirically verified components which impact modality selection, and (5) types concerning the courting of the perceived caliber of a modality and the particular utilization of a modality.
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Additional resources for An Evaluation Framework for Multimodal Interaction: Determining Quality Aspects and Modality Choice
An overview of methods assessing cognitive workload is given in De Waard (1996) and Jahn et al. (2005). A popular method is the NASA-TLX questionnaire (Hart & Staveland, 1988). A lightweight instrument shown to have excellent psychometric properties (Sauro & Dumas, 2009) even in comparison to more elaborate measures (De Waard, 1996) is the Rating Scale Mental Effort (RSME) by Zijlstra (1993). Note that the RSME is also known as the SMEQ (Subjective Mental Effort Questionnaire). Physical response effort.
This might be done during the interaction or after the interaction as retrospective Thinking Aloud. For the latter, the user is confronted with video recordings of the test session and is asked to comment on them. Although retrospective Thinking Aloud is less intrusive than online Thinking Aloud, it might probably be affected by memory biases. Another version is the plural Thinking Aloud involving multiple participants using the system together. Therewith, the unnaturalness of this method should be reduced.
Hereby, the context of the respective studies has to be carefully considered. To prevent a confirmatory bias not only the similarities, but also the dissimilarities between the interface to be evaluated and the studies serving as a basis for the evaluation have to be taken into account (Gerhard, 2003). Review-Based Evaluation is faster and more economical than conducting an own experiment. But wrong conclusions might be drawn if the selection of the considered studies is not done with the required prudence.