1. Verbraucherinformatik Research Group, University of Siegen, Germany
2. Cyber-Physical Systems, University of Siegen, Germany
3. Institute for Information Systems, University of Siegen, Germany
4. Institut für Verbraucherinformatik, Bonn-Rhein Sieg University of Applied Science, Germany and Human-Centered Engineering and Design, Fraunhofer Institute for Applied Information Technology FIT, Germany