1. Department of Computer Education & Instructional Technology, Muğla Sıtkı Koçman University, Muğla, Turkey
2. Multidisciplinair Inst. Lerarenopleiding, Vrije Universiteit Brussel, Brussels, Belgium
3. Faculty of Educational Sciences, Centre for Educational Measurement at the University of Oslo, Oslo, Norway
4. Department of Education and Quality in Learning, University of South-Eastern Norway, Notodden, Norway