1. Open Universiteit, Heerlen, the Netherlands; People & Results, São Paulo, Brazil
2. Open Universiteit, Heerlen, the Netherlands; Ghent University, Gent, Belgium
3. Open Universiteit, Heerlen, the Netherlands; Research Centre for Education and the Labour Market (ROA), Maastricht University, the Netherlands
4. Open Universiteit, Heerlen, the Netherlands; Loyalis & Consult, Heerlen, The Netherlands