Teacher Development Research Review: Keys to Educator Success
Digital Promise
JUNE 15, 2016
When teachers receive well-designed professional development, an average of 49 hours spread over six to 12 months, they can increase student achievement by as much as 21 percentile points ( Yoon, Duncan, Lee, Scarloss, and Shapley, 2007 ). educators, and Catherine Lewis, who conducts academic research on lesson study.
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