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Instruction in at least one subject in an ability-grouped class ...

„In Australia, Canada, Hong Kong (China), Ireland, Israel, Malta, New Zealand, Singapore, Thailand, the United Kingdom, the United States and Viet Nam, at least three in four students receive instruction in at least one subject in an ability-grouped class.“

OECD (Hrsg.), „PISA 2015 Results (Volume II): Policies and Practices for Successful Schools (2016), S. 176