The research
The thinkers
Physics · explanation as a test of understanding
The Feynman technique — explain it simply or you don't understand it — is the engine behind the 'convince me' page, teach-the-parent night, and the method's allergy to unexplained rules. Feynman's deeper gift was temperamental: treating not-knowing as delicious.
Mathematics · How to Solve It (1945)
Pólya's heuristics — understand the problem, find a related problem, solve a simpler case, look back — are the ancestor of the five questions. His insistence that problem-solving is teachable, not innate, is the method's founding assumption.
Psychology · the spiral curriculum
Bruner argued any idea can be taught honestly to any child at some level — which is why calculus concepts appear here at age ten. His enactive → iconic → symbolic progression is exactly the method's physical-first, picture-second, notation-last ordering.
Psychology · the zone of proximal development
Learning happens in the band between what a child can do alone and what they can do with help. That band is where the parent-coach, the thirty-second pause before helping, and the Socratic AI tutor all operate. Scaffolding — support that is deliberately temporary — is the method's model for rewards too.
Engineering education · Learning How to Learn
Oakley popularized the focused/diffuse mode distinction (why walks solve math problems), chunking, and the evidence against passive re-reading. Her own late conversion from math-phobic to engineering professor is the anti-'math person' argument in biographical form.
Psychology · Mindset (2006)
Praise for being smart teaches children to protect the label; praise for process teaches them to seek challenge. The effort-praise protocol, the banned 'not a math person' sentence, and the growth dashboard all descend from Dweck's research program — including its later refinements: mindset moves through practices, not posters.
Educational psychology · cognitive load theory
Working memory is tiny; schemas in long-term memory are the workaround. Sweller explains why fluency drills serve understanding (automatized facts stop consuming working memory), why worked examples beat pure discovery for novices, and why the method automates the layer below before building the layer above.
Psychology · Thinking, Fast and Slow (2011)
System 1 pattern-matches instantly; System 2 reasons slowly and lazily. Education is largely the project of training System 1's patterns while strengthening System 2's oversight — and Kahneman's catalog of biases is the curriculum for the 'what assumptions changed?' question.
The concepts
Pulling information out strengthens memory far more than putting it in again (the testing effect — Roediger & Karpicke's 2006 studies are the modern landmark). Implemented as: the Post-it wall, bedtime questions, teach-the-parent night.
Practice distributed over time beats identical practice massed together — the most robust effect in learning science, documented since Ebbinghaus (1885). Implemented as: two-minute daily anchors instead of Sunday drills.
Mixing related-but-different problem types outperforms blocked practice, because discrimination — noticing which tool this problem wants — is most of the skill. Implemented as: mixed-topic five-minute games and review sessions.
Learners build knowledge on what they already have; they don't receive it in finished form (Piaget, Vygotsky, Bruner). Implemented as: models before procedures, and 'can you rebuild the formula from scratch?'
The hardest, most valuable outcome: using knowledge outside the context where it was learned. Transfer improves with varied contexts and explicit abstraction of structure. Implemented as: math in the wild, and the entire Beyond Math section.
Instruction fails when working memory overflows. Reduce extraneous load (clean examples, one new thing at a time), automate the prerequisite layer, and difficulty becomes productive instead of crushing. Implemented as: fluency before complexity.
Ericsson's finding: improvement comes from effortful practice targeted at specific weaknesses with immediate feedback — not from accumulated hours. Implemented as: the bottleneck hunt and IXL-as-sniper-rifle.
Thinking about thinking — knowing what you know, choosing strategies, monitoring progress — separates strong learners from busy ones. Implemented as: the growth dashboard, the confidence audit, and 'how did you figure that out?'
The cognitive findings above — retrieval, spacing, interleaving, cognitive load — are among the most replicated results in psychology. Other pieces of the method rest on softer ground: mindset effects are real but smaller than the posters suggest; research on sex differences in classroom fit is genuinely contested; and the specific household systems here are engineering built from the science, not experiments with control groups.
We hold it all the way the method itself teaches: as a best current model, run against data (your child's), revised when the evidence says so. As the research section of an evolving body of work, this page will grow — reading lists, study summaries, and eventually research of our own.