The Evidence on Teaching
structure decisions

Curriculum choice as a school-level lever

Curriculum is nearly free, so choosing beats not choosing — but the payoff is avoiding a demonstrated loser, not finding a magic winner. Content is the high-upside bet.

mixedconf: highgc: low

curriculum · ages 4–14 · structure

Effect summary

The whole cost is attention: materials cost ~$36/student and better ones cost no more than worse ones. But the payoff is asymmetric and era-dependent — avoiding a demonstrated minimal-guidance loser is worth ~0.1-0.2 SD/yr; picking among mainstream standards-aligned texts is worth ~0-0.05; a real pedagogical contrast WITH implementation support buys ~0.07-0.1; and the one high-upside bet is CONTENT (the Core Knowledge lottery: ITT 0.24 on state ELA — single, unreplicated).

Practical takeaway

Choose curricula once, deliberately: structured, coherent, knowledge-rich, practice-heavy. Enforce a hard exclusion list (no minimal-guidance constructivist programs), buy the implementation (training + actual use — the thing schools skip), and stop optimizing among mainstream options. The content bet (knowledge-rich curriculum) is the highest-upside wager in the database.

Who this applies to

Not yet assessed. Nobody has recorded the group size, dose, delivery, or boundary conditions for this decision, so it should not be recommended for a specific situation yet — only read. That is a gap in this record, not a claim that it applies everywhere.

Verdict

Curriculum is the one lever where the entire cost is attention (~$36/student, ~40x class-size cost-effectiveness when real differences exist) — which is why the evidence arc matters so much:

  1. Under randomization, curricula genuinely differ — but as a floor, not a ceiling: the Agodini RCT's stable loser (minimal-guidance constructivist) trailed all rivals by 0.22 SD; the heterogeneous winners were indistinguishable.
  2. The brand-picking lever collapsed post-Common-Core: six-state evidence puts between-textbook differences at ~0.00–0.03 SD among mainstream aligned texts (the 2016 "textbooks rival teacher quality" claim did not survive its own replication). Implementation is hollow everywhere: ~7% exclusive use, ~3 days of career textbook PD.
  3. A real pedagogical contrast plus implementation support still buys something: whole-package adoption (materials + training + network) ≈ +0.07–0.10 SD/yr at ~£131/pupil.
  4. The content bet is the upside: the Core Knowledge kindergarten lottery (ITT 0.24, TOT 0.47 on grade 3-6 state reading) remains the strongest curriculum result anywhere in this database — genetic-confound-resistant by design, and still a single unreplicated whole-school bundle.

Hereditarian-lens assessment

Risk: low (RCT + powered nulls carry the verdict; the matched pre-CCSS studies are corroborative only). Note the interaction with the premise: curriculum effects are content and guidance effects on domain skills; no curriculum-choice study measures long-run attainment, and none moves g. The knowledge-rich bet is attractive under the lens precisely because it targets the one durable comprehension channel (knowledge) rather than promising ability change.

Practical guidance

  • The exclusion list is the lever: no minimal-guidance constructivist programs, in any subject.
  • Pick structured, coherent, knowledge-rich, practice-heavy materials once; re-adoption churn buys nothing.
  • Buy the implementation — training days, curriculum-aligned coaching, and monitored actual use — since the field's default (3 days per career) guarantees the null.
  • Take the knowledge-rich content bet (Core Knowledge-style) for ELA/humanities with eyes open: best-in-database causal upside, single-study support.

Evidence (9 sources)

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