1. Institute for Software Systems, Trier University of Applied Sciences , Umwelt-Campus Birkenfeld, 55761 Birkenfeld , Germany
2. Artificial Intelligence and Intelligent Information Systems, University of Trier , 54296 Trier , Germany
3. German Research Center for Artificial Intelligence (DFKI), Branch University of Trier , 54296 Trier , Germany
4. Intelligent Assistance Systems and Cognitive Social Simulation, University of Trier , 54296 Trier , Germany
5. Institute for Operations and Technology Management, Trier University of Applied Sciences , Umwelt-Campus Birkenfeld, 55761 Birkenfeld , Germany
6. Institute for Software Systems, Trier University of Applied Sciences , Environmental Campus Birkenfeld, 55761 Birkenfeld , Germany
7. Human-Computer Interaction , University of Trier , 54296 Trier , Germany