Abstract
The contributions to this dossier highlight the impact of major international surveys such as PASEC, but also reveal blind spots in data collected such as private tutoring. The articles point to the political issues involved in choosing to focus on certain data while ignoring others, and they show what the standardisation of education implies for the professionalism of education players. The dossier explores how involving pupils and teachers as co-constructors in the search for for enlightening data opens up new avenues for improving teaching and learning for all.