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Schools with disorderly environments ...

„TIMSS and PIRLS 2011 results showed that students who attended schools with disorderly environments and who reported more frequent bullying had much lower achievement than their counterparts in safe and orderly schools.“

IEA (Hrsg.), „TIMSS and PIRLS 2011: Relationships among reading, mathematics, and science achievement at the fourth grade“ (2013), S. 113