What is retrieval practice and how do I use it in class?

Retrieval practice is the strategy of pulling information out of memory rather than putting it back in. Instead of re-reading notes, students try to recall the material — and that effortful recall is what makes it stick. This is the testing effect, and it's one of the best-replicated results in all of learning science.

The evidence is striking:

• In a classic study (Roediger & Karpicke, 2006), students who studied a passage once and then tested themselves outperformed students who re-read it three more times — when the final test came a week later.
• A meta-analysis across 118 studies (Adesope, Trevisan & Sundararajan, 2017) found an average effect of about d ≈ 0.50 — large, and robust across ages and subjects.
• The catch: students predict the opposite. Re-reading feels productive (it's fluent and easy); retrieval feels hard, so learners wrongly judge it as less effective. That judgment-of-learning illusion is why so few students use the strategy that works.

How to use it in class (none of it needs to be graded):

1. Low-stakes recall to open class — 2–3 questions on yesterday's material, no grade. Pure retrieval.
2. Brain dumps — "write everything you remember about X" on a blank page, then check against notes.
3. Exit tickets as retrieval, not just assessment — a recall question, not a confidence rating.
4. Space it out — revisit material after a gap (the spacing effect, Cepeda et al. 2008) and mix topics rather than blocking them. These "desirable difficulties" (Bjork) slow practice but boost retention.

The fastest way to run retrieval practice daily is to generate quick, curriculum-aligned recall questions on whatever you just taught — which is exactly what a quiz generator is for.