Need a Substitute Teacher? Try an ELF Instead
Edsurge
FEBRUARY 22, 2017
In 2007, a trio of Harvard researchers found that “even 10 days of teacher absences can have an impact.reducing, for example, students’ math achievement by 3.3 This year, at Lexington High School (LHS) when teachers are absent, an “ELF” now greets students in a collaborative learning space. percent of a standard deviation.”.
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