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early child development

What a new preschool study tells us about early child education – and about impact evaluation

David Evans's picture
When I talk to people about impact evaluation results, I often get two reactions:
  1. Sure, that intervention delivered great results in a well-managed pilot. But it doesn’t tell us anything about whether it would work at a larger scale. 
  2. Does this result really surprise you? (With both positive results and null results, I often hear, Didn’t we already know that intuitively?)

A recent paper – “Cognitive science in the field: A preschool intervention durably enhances intuitive but not formal mathematics” – by Dillon et al., provides answers to both of these, as well as giving new insights into the design of effective early child education.