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Dr.-Ing. Christoph Stahl


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Since 2011, I am managing research activities in the BAALL living lab at the DFKI Bremen / Safe and Secure Cognitive Systems group, i.e. european projects in the scope of FP7, EIT, and AAL Joint Programme.
In 2010, my job was to develop an in-car demonstrator for the M2CI Cluster of Excellence that integrated components from several projects, including multimodal interaction with the car's comfort systems and a driving simulator with front projection.
In 2009, I have received a Dr.-Ing. from Saarland Unviersity for my thesis on the topic of spatial modeling of activity and user assistance in instrumented environments. My work describes the GOAL methodology for the design and development of assistance systems that integrate support for multiple activities and make intelligent use of ubicomp technologies and environments. Another result has been the Yamamoto toolkit that allows to model indoor environments with multiple levels and stairs and includes a route finding component.

My previous work in the RENA project has been focused on pedestrian assistance in intelligent environments. For example, consider the combination of shopping and navigation tasks in an airport scenario.

In the former project REAL, we have investigated how a system can assist its user in solving different tasks in an instrumented environment. The idea is to observe and recognize implicit user interaction and to let assistance applications infer about a user‘s plans and intentions and to proactively present situated information, adapted to user and context.
I have designed and set up the overall architecture of our SUPIE environment, and participated in the development of its infrastructure, such as the positioning service, presentation service and navigation assistance.
Previously, in the second period of REAL, I have implemented the automatic generation of graphical route descriptions for mobile devices in the indoor navigation system IRREAL. I have also developed the hybrid indoor- and outdoor navigation system COREAL, which has been exhibited at the CeBIT fair in 2002.

At the DFKI (Deutsches Forschungszentrum für Künstliche Intelligenz), I have been working as a researcher in industry projects with Deutsche Telekom Innovation Center and BMW (BMW Personal Navigator).

I have also been teaching student seminars on Ambient Intelligence, Location-Based Services and Intelligent User Interfaces at Saarland University.

Please visit my personal homepage for more details on my projects, and you will also find my CV there.

In 2007 I have co-organized a workshop on modelling and designing user assistance in intelligent environments (MODIE).
Reviewing activity: IE05, MODIE Workshop 2006, MobileHCI 2008, CHI 2009, MobileHCI 2009, HSI09, HSI10, TEI'10, IPIN 2010, TEI'11, TSMPAD Workshop, MobileHCI 2011-2012, WI&C'12, AAL Kongress 2012, PerCom 2012, NordiCHI'12, CHI 2012, SENSORS Journal
PC Member: 2nd Workshop on Spatial Awareness and Geographic Knowledge Acquisition with Small Mobile Devices (You Are Here 2), 3rd Int. Workshop on Web Intelligence & Communities (WI&C'11, WI&C'12), TSMPAD Workshop, LTPC Workshop

If you'd like to take a tour in a venetian gondola near Munich, please visit my father's website :)


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  • UbisWorld   2001-01-31 – 2011-01-31
  • RENA   2005-01-01 – 2007-12-31
  • REAL-p3   2002-01-01 – 2004-12-31
  • REAL-p2   1999-01-01 – 2001-12-31


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Using Natural Footstep-Accurate Traces for Indoor Positioning Evaluation
Tim Schwartz, Christoph Stahl, Angela Mahr, Christian Müller and Bahjat Saliba
Proceedings of the 2012 International Conference on Indoor Positioning and Indoor Navigation (IPIN)
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Synchronized Realities
Christoph Stahl, Jochen Frey, Jan Alexandersson, Boris Brandherm
Journal of Ambient Intelligence and Smart Environments, Vol. 3, Nr. 1/2011, pp. 13-25, IOS Press.
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The DFKI Competence Center for Ambient Assisted Living
Jochen Frey, Christoph Stahl, Thomas Röfer, Bernd Krieg-Brückner, and Jan Alexandersson
Ambient Intelligence 2010
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UbiSpot – A User Trained Always Best Positioned Engine for Mobile Phones
Tim Schwartz, Christoph Stahl, Christian Müller, Hao Ji, Valentin Dimitrov
Proceedings of Ubiquitous Positioning Indoor Navigation and Location Based Service (UPINLBS 2010), IEEE, ISBN 978-1-4244-7878-1
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Modeling of Multi‐level Indoor Environments: Wayfinding Support and Empirical Studies
Christoph Stahl and Stefan Münzer
Tutorial, held in conjunction with the International Conference on Spatial Cognition 2010, Mt. Hood / Portland, Oregon
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Modeling and Simulating Ambient Assisted Living Environments - A Case Study
Tim Laue and Christoph Stahl
In Proceedings: Ambient Intelligence and Future Trends-International Symposium on Ambient Intelligence (ISAmI 2010), Advances in Soft Computing, Vol.72, pp. 217-200. Berlin: Springer. Http://www.springerlink.com/content/e4247wl8g5377230/?p=06a9ebf68e744432a0d65189f6a013d5
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Seamless Resource Adaptive Navigation
Tim Schwartz, Christoph Stahl, Jörg Baus, and Wolfgang Wahlster
In: Matthew Crocker and Joerg Siekmann (eds). Resource-Adaptive Cognitive Processes. Cognitive Technologies Series. Springer Verlag, Berlin, 2010, pp. 239-265

Local Danger Warnings for Drivers: The Effect of Modality and Level of Assistance on Driver Reaction
Yujia Cao, Angela Mahr, Sandro Castronovo, Mariet Theune, Christoph Stahl, and Christian Müller
IUI 2010 (to appear)
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Spatial Modeling of Activity and User Assistance in Instrumented Environments
Christoph Stahl
Dissertation, Saarland University, 2009
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UbisWorld 3.0: a Semantic Tool Set for Ubiquitous User Modeling
Dominikus Heckmann, Matthias Loskyll, Rafael Math, Pascal Recktenwald, Christoph Stahl
Demonstration description in online proceedings of First International Conference on User Modeling, Adaptation, and Personalization (UMAP 2009)
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An Activity-Based Approach to the Design of User Assistance in Intelligent Environments
Christoph Stahl, Dominikus Heckmann, Michael Schneider, Alexander Kröner
Capturing Ambient Assisted Living Needs, International Workshop at AmI 2008 Conference, November 19th 2008, Nürnberg.
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Learning of Visual Route Instructions for Indoor Wayfinding
Stefan Münzer and Christoph Stahl
Hölscher, C. (Ed.) Spatial Cognition 2008 Poster Proceedings. International Conference on Spatial Cognition, Sept. 15-19, 2008, Freiburg, Germany. SFB/TR8 Report No. 016-08/2008. Universität Bremen / Universität Freiburg.
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New Perspectives on Built Environment Models for Pedestrian Navigation
Christoph Stahl
Hölscher, C. (Ed.) Spatial Cognition 2008 Poster Proceedings. International Conference on Spatial Cognition, Sept. 15-19, 2008, Freiburg, Germany. SFB/TR8 Report No. 016-08/2008. Universität Bremen / Universität Freiburg.
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Räumliches Lernen mit Navigationssystemen
Stefan Münzer, Hubert Zimmer, Jörg Baus and Christoph Stahl
magazin forschung, Universität des Saarlandes, 2/2007, S. 2-7

Providing Individual Route Instructions for Indoor Wayfinding in Complex, Multi-Level Buildings
Stefan Münzer, Christoph Stahl
GI-Days 2007 Young Researchers Forum, Sept. 10-12, Münster, ifgi Prints series - to appear
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The Roaring Navigator: A Group Guide for the Zoo with Shared Auditory Landmark Display
Christoph Stahl
In: Proceedings of the 9th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI '07). ACM (SIGCHI), New Nork. pp. 219-222
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Here and Now: A User-Adaptive and Location-Aware Task Planner
Christoph Stahl, Dominik Heckmann, Tim Schwartz, Oliver Fickert
International Workshop on Ubiquitous and Decentralized User Modeling (UbiDeUM'2007), pp. 52-63
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Sharing Control of Dispersed Situated Displays between Nomadic and Residential Users
Christian Kray, Keith Cheverst, Daniel Fitton, Mark Rouncefield, Corina Sas, Christoph Stahl
In Proceedings of the 8th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI 2006), ACM Press, 2006, pp. 61-68
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Modelling and Designing User Assistance in Intelligent Environments (MODIE 2006)
Thomas Pederson, Helder Pinto, Michael Schmitz, Christoph Stahl, Lucia Terrenghi (Eds.)
SFB 378 - Resource-Adaptive Cognitive Processes, Memo Nr. 86: Modelling and Designing User Assistance in Intelligent Environments (MODIE 2006) Workshop in Conjunction with the 8th International Conference on Human Computer Interaction with Mobile Devices and Services (MobileHCI 2006), ISSN 0944-7822, Saarland University
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Simulating and Evaluating Public Situated Displays in Virtual Environment Models
Christoph Stahl, Jens Haupert
International Workshop on Modelling and Designing User Assistance in Intelligent Environments (MODIE 2006). In: SFB 378 - Resource-Adaptive Cognitive Processes, Memo Nr. 86: Thomas Pederson, Helder Pinto, Michael Schmitz, Christoph Stahl, Lucia Terrenghi (Eds.): MODIE 2006, ISSN 0944-7822, pp. 32-35, 2006. Saarland University
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Taking Location Modelling to new Levels: A Map Modelling Toolkit for Intelligent Environments
Christoph Stahl and Jens Haupert
2nd International Workshop on Location- and Context-Awareness. In: M. Hazas, J. Krumm, and T. Strang (Eds.): LoCA 2006, LNCS 3987, pp. 74 – 85, 2006. Springer-Verlag Berlin Heidelberg.
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Towards a Notation for the Modeling of User Activities and Interactions Within Intelligent Environments
Christoph Stahl
3rd International Workshop on the Tangible Space Initiative (TSI 2006). In: Thomas Strang, Vinny Cahill, Aaron Quigley (Editors). Pervasive 2006 Workshop Proceedings, Deutsches Zentrum für Luft- und Raumfahrt, pages 441-452. ISBN 978-3-00-018411-6
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Navigational- and Shopping Assistance on the Basis of User Interactions in Intelligent Environments
C. Stahl, J. Baus, B. Brandherm, M. Schmitz and T. Schwartz
Proceedings of the IEE International Workshop on Intelligent Environments (IE 2005), University of Essex, Colchester, UK, 2005
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Managing Presentations in an Intelligent Environment
Christoph Stahl, Michael Schmitz, Antonio Krüger, Jörg Baus
MU3I Workshop at IUI 2005, San Diego, USA.
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Resource-Adaptive Personal Navigation
Jörg Baus, Antonio Krüger, Christoph Stahl
Chapter in: O. Stock and M. Zancanaro (eds.), Multimodal Intelligent Information Presentation, pages 71-93, Springer, 2005, ISBN: 1-4020-3049-5.


Using Semantic Web Technology for Ubiquitous Location and Situation Modeling.
Christoph Stahl, Dominik Heckmann
The Journal of Geographic Information Sciences, CPGIS: Berkeley, Vol. 10, No. 2., December 2004, pages 157-165.
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Using Semantic Web Technology for Ubiquitous Hybrid Location Modelling
Christoph Stahl, Dominik Heckmann
1st Workshop on Ubiquitous GIS, in conjunction with 12th International Conference on Geoinformatics, 7-9 June 2004 - Gävle, Sweden.
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REAL: Situated Dialogues in Instrumented Environments
C. Stahl, J. Baus, A. Krüger, D. Heckmann, R. Wasinger, M. Schneider
Workshop on Invisible and Transparent Interfaces at AVI 2004, Gallipoli, Italy, 2004, pp. 10-15.
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The Connected User Interface: Realizing a Personal Situated Navigation Service
Antonio Krüger, Andreas Butz, Christian Müller, Christoph Stahl, Rainer Wasinger, Karl-Ernst Steinberg, Andreas Dirschl
In Proceedings of the 9th International Conference on Intelligent User Interfaces (IUI 2004), ACM Press, 2004, pp. 161-168.
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Adapting Spoken and Visual Output for a Pedestrian Navigation System, based on given Situational Statements
Rainer Wasinger, Dominika Oliver, Dominik Heckmann, Bettina Braun, Boris Brandherm, Christoph Stahl
11th GI-Workshop on Adaptivity and User Modeling in Interactive Software Systems (ABIS-2003), Karlsruhe, 2003, pp. 343-346.
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M3I in a Pedestrian Navigation & Exploration System
Rainer Wasinger, Christoph Stahl, Antonio Krüger
5th International Symposium on Human Computer Interaction with Mobile Devices (Mobile HCI 2003), Udine, Italy, September 8-11, 2003, Springer: Lecture Notes in Computer Science, Vol. 2795, Chittaro, Luca (Ed.), ISBN: 3-540-40821-5, pp. 481-485.
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Robust speech interaction in a mobile environment through the use of multiple and different media types
Rainer Wasinger, Christoph Stahl, Antonio Krüger
8th European Conference on Speech Communication and Technology (EUROSPEECH 2003 - INTERSPEECH 2003), Geneva, Switzerland, September 1-4, 2003, ISCA Archive, pp. 1049-1052.
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A Framework for Intelligent Instrumented Environments
Christoph Stahl
Two-page abstract in the UBICOMP 2002 doctoral consortium notes.

Location Dependent Generation of Sketches for Mobile Indoor Route Descriptions
Christoph Stahl, Antonio Krüger, Jörg Baus
ECAI 2002 Workshop notes on Artificial Intelligence in Mobile Systems (AIMS).

Positionsabhängige Kartengenerierung für mobile Fußgängernavigationssyteme
A. Krüger, C. Stahl, J. Baus
Simulation und Visualisierung, Magdeburg 28.Feb.-1. März 2002. SCS-Verlag, ISBN 1-56555-234-2, ISBN 3-936150-15-x.
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VAI: Ein System zur intelligenten Navigation durch VRML Welten mittels graphischer Abstraktion
Christoph Stahl
Diplomarbeit an der Universität des Saarlandes
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Graphical Abstraction and 3D-Hypergraphics: Exploring Large Geometrical 3D-Models.
Antonio Krüger, Christoph Stahl
Combining AI and Graphics for the Interface of the Future (ECAI 1998), Brighton, UK, August 1998.
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Intelligente Navigation in 3D-Welten: Zur Rolle graphischer Abstraktion
Antonio Krüger, Christoph Stahl
Simulation und Visualisierung, SCS-Verlag, Magdeburg, 5.-6. März 1998.
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Advised Student Projects

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Finished Student Projects