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
domain
- math6
- reading6
- early childhood5
- health4
- debunked3
- practice3
- arts2
- grouping2
- instruction style2
- motor skills2
- time2
- behavior1
- class size1
- curriculum1
- deliberate practice1
- feedback1
- foreign language1
- history civics1
- mastery1
- physical development1
- practical1
- retention1
- school structure1
- science1
- sport1
- talent1
- teachers1
- transfer1
- tutoring1
confidence
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
group / setting
outcome class
Later bells buy adolescents 40+ measured minutes of sleep — the best-identified positive effect in the archive; the achievement payoff is real but far smaller.
strong supportconf: mediumgc: low18/1836/48
Do later school start times increase adolescent sleep, and does that raise achievement? · health · ages 11–18 · input
Immersion costs nothing in English and buys a little — a lottery puts English reading 0.13-0.22 SD ahead by grades 5 and 8 — but no lottery has ever measured how much of the second language students actually learn.
moderate supportconf: mediumgc: low8/824/48
Does dual-language immersion work, and is the gain in the second language or in English? · foreign-language · ages 4–18
Not yet assessed for this question · 3
The URL is the state — any view you build here is a permalink you can hand to someone mid-argument.