„IELS 2025 [Anm.: IELS = International Early Learning and Child Well-being Study] finds pervasive socio-economic gaps in learning and development outcomes by age 5. These gaps are most substantial in foundational learning: socio-economically advantaged children score on average between 60 and 70 points higher than disadvantaged peers in emergent literacy and emergent numeracy.“
OECD (Hrsg.), Building Strong Foundations for Life (2026), S. 61.