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
domain
- math6
- reading6
- early childhood5
- debunked3
- health3
- practice3
- grouping2
- instruction style2
- motor skills2
- transfer2
- arts1
- character1
- class size1
- curriculum1
- deliberate practice1
- edtech1
- feedback1
- foreign language1
- homeschool1
- mastery1
- music1
- physical development1
- school structure1
- sport1
- talent1
- teachers1
- time1
- tutoring1
- writing1
layer
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
group / setting
outcome class
Attainment falls steadily with age of first exposure, but the sharp critical period is contested and an earlier classroom start buys nothing durable: start young for immersion, not for two lessons a week.
mixedconf: mediumgc: medium14/1424/48
Is there a critical period for learning a second language, and when should a child start? · foreign-language · ages 4–18
Not yet assessed for this question · 7
- Algebra timing — acceleration mandates, delay mandates, and readiness-based placement
- Explicit vs reform/constructivist math instruction
- Manipulatives and concrete-representational-abstract (CRA) sequences
- Math curriculum choice — how much does the textbook matter?
- Math-fact fluency and timed practice (and the anti-timed-test claims)
- School spending, charters, and what school-level choices actually move outcomes
- Word problems, schema instruction, and the conceptual-vs-procedural question
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