TU Berlin

Quality and Usability LabStefan Schaffer

Inhalt des Dokuments

zur Navigation

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
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.
Link zur Publikation Download Bibtex Eintrag



Schnellnavigation zur Seite über Nummerneingabe