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Dividing by zero: Exploring null results in a mathematics professional development program

Since 2002, U.S. federal funding for educational research has favored the development and rigorous testing of interventions designed to improve student outcomes. However, a large proportion of the programs developed and rigorously tested in the past decade have shown null results on both student outcomes and, often, intermediate variables. In this paper, we argue for a more systematic approach to examining null results, and illustrate this approach via an examination of one program’s failure to impact teaching and learning.
Läs vidare/Read more [Teachers College Record]

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