1. Department of Educational Studies, Ghent University, Ghent, Belgium
2. Learning Research and Development Center, University of Pittsburgh, Pittsburgh, PA, USA
3. Department of Teacher Education, Vrije Universiteit Brussel, Brussels, Belgium
4. College of Child Development and Education, University of Amsterdam, Amsterdam, the Netherlands
5. Department of Teacher Education, Windesheim University of Applied Sciences, Zwolle, the Netherlands
6. Center for Adult Education Het Perspectief, Ghent, Belgium