1. School of Business, Economics & IT, Division of Informatics, University West, SE-461 86 Trollhättan, Sweden
2. Department of Pedagogical, Curricular and Professional Studies, University of Gothenburg, PO Box 300, SE- 405 30 Göteborg, Sweden
3. Department of Education, Communication and Learning, University of Gothenburg, PO Box 300, SE-405 30 Göteborg, Sweden