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
survival prior
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
group / setting
High-dosage tutoring is education's most reliable lever: ~0.29 SD in trials, ~0.2 well-scaled — not Bloom's 2σ. Groups of 3–4 work; 1:1 is unnecessary.
strong supportconf: highgc: low18/1830/48connected:Class-size reductionDoes educational technology raise The parent as instructorSchool spending, charters, and wha
Tutoring — the honest effect, the Bloom 2-sigma myth, and what survives scale · tutoring · ages 5–18 · method
Not yet assessed for this question · 8
- Class-size reduction
- Grade retention — holding a child back versus promoting, and test-based promotion policies
- Homeschool socialisation — the most-asked question, and the least answerable one
- Length of the school day and year, time-on-task, extended time, and summer
- Preschool at scale — Head Start, state pre-K, and what universal provision delivers
- Perry Preschool and Abecedarian — what the famous studies actually establish
- School starting age, relative age, and academic redshirting
- Vision — outdoor time against myopia, and screening and correction for achievement
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