Institutes of fourteen Dutch and Belgian universities participate in ICO. These universities constitute the inter-university graduate school ICO:
| Eindhoven University of Technology | • Eindhoven School of Education (ESoE) |
| Erasmus University Rotterdam | • Erasmus School of Social and Behavioural Sciences |
| Leiden University | • ICLON: Interfacultair Centrum voor Lerarenopleiding, Onderwijsontwikkeling en Nascholing • Department of Education and Child Studies |
| Maastricht University | • Faculty of Health, Medicine and Life sciences • School of Business and Economics |
| Open University of the Netherlands | • Faculty of Educational Sciences • Faculty of Management |
| Radboud University Nijmegen | • Radboud Docenten Academie • Department of Educational Sciences • Institute for Science Education |
| TU Delft | – Teaching Academy – Science & Engineering Education |
| Université Catholique de Louvain | • Education and Training School (EDEF) |
| University of Amsterdam | • Faculty of Social and Behavioural Sciences (FMG): Afdeling Pedagogische en Onderwijswetenschappen |
| University of Antwerp | • Faculty of Social Sciences |
| University of Groningen | • Faculty of Behavioural and Social Sciences with Nieuwenhuis Institute for Educational Research |
| University of Twente | • Faculty of Behavioural, Management and Social Sciences |
| Utrecht University | • Faculty of Social Sciences • Freudenthal Institute • Utrecht Center for Research and Development of Health Professions Education UMCU • Institute for Language Sciences |
| Vrije Universiteit Amsterdam | • Faculty of Behavioural and Human Movement Sciences • The Institute for Education and Training, VUmc School of Medical Sciences |
| Wageningen University | • Departement of Social Sciences with Leerstoelgroep Education and Learning Sciences |