Despite spending billions on professional development (PD) in the United States, well-regarded studies by organizations such as American Institutes for Research (AIR) and TNTP show no measurable results from this spending. This was the case even when the training was considered rigorously aligned to the tenets of best practice for educator professional development. At the same time, student outcomes, especially for students of color and students living in poverty, are unacceptable.
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