This book systematically addresses the quantification of quality aspects of multimodal interactive systems. The conceptual structure is based on a schematic view on human-computer interaction where the user interacts with the system and perceives it via input and output interfaces. Thus, aspects of multimodal interaction are analyzed first, followed by a discussion of the evaluation of output and input and concluding with a view on the evaluation of a complete system.

Introduction and Motivation.- Evaluating Multimodal Systems.- The Multimodal Interactive System: INSPIRE Me.- Quantifying Multimodal Interaction Behaviour.- Quantifying Output Quality Aspects.- Quantifying Input Quality Aspects.- Quantifying Quality Aspects of a Multimodal Interactive System.- Conclusion.- INSPIRE Me Graphics.- Experiments.- Multimodal Interaction Parameters.- Dialogue- and communication-related interaction parameters.- Cognitive Demand, USE and Quesi.- Embodied Conversational Agents Scale (ECAS).- Glossary.- References.