Explore the evidence
2 of 88 decisions · clear everything
Survives the gold standardIndependent, durable, rigorousThe debunked shelfCheap winsFor parents at homeFamous numbers, deflatedWhere we admit ignoranceThe terrain
layer
survival prior
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
group / setting
At scale, pre-K doesn't durably raise test scores — Tennessee went negative — yet Boston shows real attainment gains beside a test-score zero. It buys trajectory, not ability.
mixedconf: highgc: lowPreschool at scale — Head Start, state pre-K, and what universal provision delivers · early-childhood · ages 4–5 · structure
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: lowPerry Preschool and Abecedarian — what the famous studies actually establish · early-childhood · ages 4–5 · structure
Not yet assessed for this question · 6
- Physical activity as an input — dose, fitness, and school outcomes
- Homeschool socialisation — the most-asked question, and the least answerable one
- Does teaching movement transfer to cognition, achievement, or lifelong activity?
- School starting age, relative age, and academic redshirting
- Vision — outdoor time against myopia, and screening and correction for achievement
- Early sport specialization, talent selection, and the relative age effect
The URL is the state — any view you build here is a permalink you can hand to someone mid-argument.