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Ability grouping is relatively widespread across OECD countries ...

„Ability grouping is relatively widespread across OECD countries, with more than 70 % of students attending schools whose principal reported that students are grouped by ability for mathematics classes. Over 95 % of students in Australia, Ireland, Israel, Kazakhstan, Malaysia, New Zealand, the Russian Federation, Singapore and the United Kingdom attend such schools.“

OECD (Hrsg.), „Equations and Inequalities“ (2016), S. 99