The Evidence on Teaching

Explore the evidence

6 of 88 decisions · 1 collapse at your settings · 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
survival prior
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
group / setting
cost
outcome class

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: low
11/1748/48connected:FadeoutPerry Preschool and Abecedarian

Preschool at scale — Head Start, state pre-K, and what universal provision delivers · early-childhood · ages 4–5 · structure

Starting school older mostly manufactures an age-at-test artifact: the IQ effect collapses to ~−0.07 once identified. Real residues: less hyperactivity, unchanged attainment.

mixedconf: highgc: low
6/636/48connected:Algebra timing

School starting age, relative age, and academic redshirting · early-childhood · ages 4–7 · structure

Classroom order is causally worth a great deal — one disruptive peer costs classmates 3% of adult earnings — yet no branded behaviour programme reliably delivers it and exclusion makes things worse.

mixedconf: mediumgc: low
15/2536/48connected:Talent and trainabilityCan executive function be trained,Should a school buy a social and eAre self-control and grit teachabl

How should a school run its classrooms and its discipline system? · behavior · ages 4–18 · 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: low
5/836/48connected:Preschool at scale

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

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
10/3336/48connected:Homeschool socialisationDoes homeschooling raise achievemeThe early home environmentTutoring

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

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

insufficientconf: lowgc: highinsufficient at your settings
0/2324/48connected:Does homeschooling raise achievemeThe parent as instructor

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

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