The Evidence on Teaching

Explore the evidence

6 of 88 decisions · clear everything

Survives the gold standard Independent, durable, rigorous The debunked shelf Cheap wins For parents at home Famous numbers, deflated Where we admit ignorance The terrain

evidenceall drop D A–B A only

evaluatorany no dev-led independent

durabilityany follow-up ≥1yr ≥2yr

what are these? →

Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”

who's delivering

group / setting

cost

outcome class

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: low

18/1830/48connected:Class-size reduction Does educational technology raise The parent as instructor School spending, charters, and wha

Tutoring — the honest effect, the Bloom 2-sigma myth, and what survives scale · tutoring · ages 5–18 · method

Brain training improves the trained task and nothing else: far transfer to intelligence or achievement is 0.001 against active controls.

no effectconf: highgc: low

18/1824/48connected:Fadeout Talent and trainability Does learning to code improve gene Can executive function be trained,+1

Does working-memory or brain training transfer to intelligence and achievement? · transfer · ages 4–18 · debunked

What parents are asked to DO is the whole effect: tutoring a skill d≈1.15, listening to reading 0.51, reading aloud ~0.18 — same parent, same child. All deflate under better designs.

mixedconf: mediumgc: medium

33/3336/48connected:Homeschool socialisation Does homeschooling raise achieveme The early home environment Tutoring

The parent as instructor — what survives when the person teaching is the person who raised the child · homeschool · ages 4–18 · method

Coding instruction teaches coding (d≈0.68) and not thinking: against active controls far transfer is g=0.15, two validated-instrument RCTs found d≈0.00, and a 46-school maths trial found −0.16 to −0.21.

no effectconf: mediumgc: low

21/2118/48connected:Does working-memory or brain train Does teaching programming actually Fadeout

Does learning to code improve general thinking? · transfer · ages 5–16

No study of homeschooling has a counterfactual — the famous percentile claims are selection all the way down. The honest answer: nobody knows.

insufficientconf: lowgc: high

23/2336/48connected:Homeschool socialisation The parent as instructor Systematic/explicit phonics vs who Math-fact fluency and timed practi

Does homeschooling raise achievement and attainment, or does it select the children who would have done well anyway? · homeschool · ages 5–18 · structure

Homeschoolers get plenty of social contact but measurably fewer, closer peer ties; whether that helps or harms has never been causally tested.

insufficientconf: lowgc: high

23/2324/48connected:Does homeschooling raise achieveme The parent as instructor

Homeschool socialisation — the most-asked question, and the least answerable one · homeschool · ages 6–18 · structure

The URL is the state — any view you build here is a permalink you can hand to someone mid-argument.