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Stefan Schaffer

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Research Field

Usability

Research Topics

• Multimodal Human-Computer Interaction
• Model-based Usability Evaluation
• User Modeling

Biography

Stefan Schaffer studied Communication Science and Computer Science at the Technical University Berlin. In 2009 he completed his degree and received the Willumeit prize for his Magister thesis. He has joined the research training group prometei and is currently working towards his PhD thesis in the domain of model-based usability evaluation of multimodal systems.

Address

Technische Universität Berlin
Zentrum Mensch-Maschine-Systeme
Graduiertenkolleg prometei
Sekretariat FR 2-6
Franklinstr. 28/29
D-10587 Berlin

Tel: +49 (30) 314 - 29637
Fax: +49 (30) 314 - 25996

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Publications

A Model of Shortcut Usage in Multimodal Human-Computer Interaction
Zitatschlüssel	schaffer2011c
Autor	Schaffer, Stefan and Schleicher, Robert and Möller, Sebastian
Buchtitel	HCI International
Seiten	337–346
Jahr	2011
ISBN	978-3-642-21798-2
DOI	10.1007/978-3-642-21799-9_38
Ort	US-Orlando, FL
Monat	9.-14. July
Verlag	Springer
Zusammenfassung	Users of multimodal systems have to choose between different interaction strategies. Thereby the number of interaction steps to solve a task can vary across the available modalities. In this work we introduce such a task and present empirical data that shows that strategy selection of users is affected by modality specific shortcuts. The system under investigation offered touch screen and speech as input modalities. We introduce a first version of an ACT-R model that uses the architectures-inherent mechanisms production compilation and utility learning to identify modality-specific shortcuts. A simple task analysis is implemented in declarative memory. The model reasonably accurate matches the human data. In our further work we will try to get a better fit by extending the model with further influence factors of modality selection like speech recognition errors. Further the model will be refined concerning the cognitive processes of speech production and touch screen interaction.