1. Teaching and Learning with Technology, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
2. Centre for Learning and Teaching, University of Groningen, P.O. Box 800, 9700 AV Groningen, The Netherlands
3. Faculty of Behavioural Sciences, University of Groningen, Landleven 1, 9747 AD Groningen, The Netherlands