The Evidence on Teaching

Explore the evidence

1 of 88 decisions · clear everything

Survives the gold standardIndependent, durable, rigorousThe debunked shelfCheap winsFor parents at homeFamous numbers, deflatedWhere we admit ignoranceThe terrain
evidencealldrop DA–BA only
evaluatoranyno dev-ledindependent
durabilityanyfollow-up≥1yr≥2yr
what are these? →
sortconfidencerobustfragileA–Z
domain
verdict
confidence
layer
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
  • nothing assessed yet
group / setting
  • nothing assessed yet
cost
  • nothing assessed yet
outcome class
  • nothing assessed yet

Perry and Abecedarian: n=123 and n=111, IQ gains gone by adolescence, attainment effects real but multiplicity-fragile. Too thin to carry the policy built on them.

mixedconf: mediumgc: low
8/836/48connected:Preschool at scale

Perry Preschool and Abecedarian — what the famous studies actually establish · early-childhood · ages 4–5 · structure

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