„Socio-economic status continues to have an important influence on education outcomes. Recent national and international test results, in particular from the 2016 Progress in International Reading Literacy Study (PIRLS) on the reading competences of 10 year-olds, confirm significant performance gaps. The difference in test results between those from the wealthiest and poorest socio-economic backgrounds has continuously widened since 2006.“
EU-Kommission, Education and Training Monitor 2018 (2018), S. 11.