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TU Berlin

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Stefan Schaffer


Research Field


Research Topics

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


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.


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



A Model of Shortcut Usage in Multimodal Human-Computer Interaction
Citation key schaffer2011c
Author Schaffer, Stefan and Schleicher, Robert and Möller, Sebastian
Title of Book HCI International
Pages 337–346
Year 2011
ISBN 978-3-642-21798-2
DOI 10.1007/978-3-642-21799-9_38
Location US-Orlando, FL
Month 9.-14. July
Publisher Springer
Abstract 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.
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