1. School of Engineering and Innovation, Open University, Milton Keynes, UK
2. School of Computing and Communications, Open University, Milton Keynes, UK
3. Department of Science and Technology, Universidade Aberta, Lisbon, Portugal
4. Department of Education and Distance Learning, Universidade Aberta, Lisbon, Portugal
5. Science Faculty, Universidad Nacional de Educacion a Distancia, Madrid, Spain
6. Department of Political Science, FernUniversität, Hagen, Germany