Use spaced repetition of core ideas in teaching and coaching

Revisiting key concepts across sessions builds fluent understanding — mere exposure amplifies spaced practice.

Why it works

Spaced repetition is primarily a memory phenomenon (encoding strength increases with distributed practice), but mere exposure adds an affective layer: concepts that feel familiar are also rated as more credible and more likely to be true — the "illusory truth effect." Teaching core ideas repeatedly, across varied contexts, builds both comprehension and a sense of rightness that supports adoption.

How to do it

1. Identify the two or three most important ideas you are trying to help someone understand.
2. Return to them in varied forms across multiple sessions — different examples, different angles.
3. Resist the urge to move to new content before the core ideas feel fluent and natural to the learner.

Evidence

The illusory truth effect — that repeated statements are rated as more true — is well-replicated in memory research. Combined with spaced practice effects on retention, repetition is among the most evidence-supported pedagogical tools. (rct)

The illusory truth effect also applies to misinformation — repetition increases belief regardless of accuracy. This is an ethical constraint: only repeat claims you have verified.

Sources

• Hasher, Goldstein & Toppino (1977), illusory truth effect, Journal of Verbal Learning and Verbal Behavior
• Cepeda et al. (2006), spaced practice meta-analysis, Psychological Science in the Public Interest

Common mistake

Racing through a curriculum and introducing new ideas before the foundational ones are fluent — depth of understanding suffers and the learner retains isolated fragments rather than a usable framework.