More and more children in the Netherlands are being given a dyslexia certificate. These are children who have a serious deficit in reading and spelling. From group 3 in primary school, the language development of children is closely monitored. If dyslexia is suspected, strict protocols are then followed. Before this diagnosis can be issued, the school must first demonstrate that the pupil has received extra help for a longer period. But how are these diagnoses made in practice? Do we measure dyslexia or inadequate education? Zembla investigates the diagnosis of dyslexia.