By the end of middle school, students may lose a third to half of what
they learn during the year to the so-called "summer slide." Over time, they make less progress during the school year, so are losing proportionately more. Socio-economics is not the main driver.
Hauser, C. (20150. NWEA 2015 MAP norms for student and school achievement status and growth. Portland, OR: Northwest Evaluation Association. https://www.nwea.org/content/uploads/2018/01/2015-MAP-Norms-for-Student-and-School-Achievement-Status-and-Growth.pdf
Hauser, C. (20150. NWEA 2015 MAP norms for student and school achievement status and growth. Portland, OR: Northwest Evaluation Association. https://www.nwea.org/content/uploads/2018/01/2015-MAP-Norms-for-Student-and-School-Achievement-Status-and-Growth.pdf
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