1. Department of Educational Sciences, University of Duisburg–Essen, Essen, Germany
2. Centre for Educational Practice Research, University of Johannesburg, Johannesburg, South Africa
3. Department of Childhood Education, University of Johannesburg, Johannesburg, South Africa
4. Swiss Federal Institute for Vocational Education and Training, Zollikofen, Switzerland
5. Faculty of Human Sciences, University of Potsdam, Potsdam, Germany