1. Institute for Education and Culture, Friedrich-Schiller-Universität Jena, Jena, Germany
2. Department of Education Information Technology, East China Normal University, Shanghai, China
3. School of Teacher Education, Jiangsu University, Jiangsu, China
4. Institute of Education and Culture, University of Jena, Germany
5. UCL Knowledge Lab, Institute of Education, University College London, London, UK
6. School of Education, Liverpool John Moores University, UK
7. Department of Learning Technologies, College of Information, University of North Texas, Denton, USA