About the Authors

Mark Levels

m.levels@maastrichtuniversity.nl

Affiliations Maastricht University, Maastricht, The Netherlands, College for Interdisciplinary Education Research, Berlin, Germany, Nuffield College, Oxford, United Kingdom

Jaap Dronkers

† Deceased.

Affiliation Maastricht University, Maastricht, The Netherlands

Christopher Jencks

Affiliation Kennedy School of Government, Harvard University, Cambridge (MA), United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: ML CJ. Data curation: ML. Formal analysis: ML. Funding acquisition: ML. Methodology: ML JD. Writing – original draft: ML JD CJ. Writing – review & editing: ML CJ.