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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 [2] for his Magister thesis. He has joined the research training group prometei [3] 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

Modeling Input Modality Choice in Mobile Graphical and Speech Interfaces
Zitatschlüssel	schaffer2015a
Autor	Schaffer, Stefan and Schleicher, Robert and Möller, Sebastian
Seiten	21–34
Jahr	2015
ISSN	1071-5819
DOI	10.1016/j.ijhcs.2014.11.004
Journal	Int. Journal of Human-Computer Studies
Jahrgang	73
Nummer	3
Monat	mar
Notiz	print/online
Zusammenfassung	In this paper, we review three experiments with a mobile application that integrates graphical input with a touch-screen and a speech interface and develop a model for input modality choice in multimodal interaction. The model aims to enable simulation of multimodal human–computer interaction for automatic usability evaluation. The experimental results indicate that modality efficiency and input performance are important moderators of modality choice. Accordingly, we establish a utility-driven model that provides probability estimations of modality usage, based on the parameters of modality efficiency and input performance. Four variants of the model that differ in training data are fitted by means of Sequential Least Squares Programming. The analysis reveals a considerable fit regarding averaged modality usage. When applied to individual modality usage profiles, the accuracy decreases significantly. In an application example it is shown how the modality choice mechanism can be deployed for simulating interaction in the field of automatic usability evaluation. Results and possible limitations are discussed.

Link zur Publikation [5] Link zur Originalpublikation [6] Download Bibtex Eintrag [7]

Zurück [8]

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[1] http://www.qu.tu-berlin.de/fileadmin/_migrated/pics
/Schaffer_Stefan_09.jpg

[2] http://www.willumeit-stiftung.de

[3] http://www.prometei.de

[4] http://www.qu.tu-berlin.de/fileadmin/_migrated/pics
/email-schaffer_01.jpg

[5] https://www.qu.tu-berlin.de/fileadmin/fg41/publicat
ions-restricted/schaffer_2015_modeling-input-modality-c
hoice-in-mobile-graphical-and-speech-interfaces.pdf

[6] http://www.sciencedirect.com/science/article/pii/S1
071581914001608

[7] https://www.qu.tu-berlin.de/menue/team/alumni/sscha
ffer/parameter/de/font4/maxhilfe/?no_cache=1&tx_sib
ibtex_pi1%5Bdownload_bibtex_uid%5D=11945284&tx_sibi
btex_pi1%5Bcontentelement%5D=tt_content%3A219785

[8] https://www.qu.tu-berlin.de/menue/team/alumni/sscha
ffer/parameter/de/font4/maxhilfe/