The science of quizzing: why retrieval practice works and how to do it well
Decades of research say quizzing is one of the most effective learning strategies. The practical guide to implementing it.
Dr. Lisa Chen
Education Researcher
The testing effect
One of the most replicated findings in cognitive psychology is the testing effect: retrieving information from memory strengthens that memory more than re-reading or re-studying the same information. A student who closes their notes and tries to recall what they have learned will remember more the following week than one who reads their notes again.
Why it feels counterintuitive
Rereading feels productive because it is fluent and comfortable. Testing feels difficult because it involves struggle and failure. But the difficulty is the mechanism — the effortful retrieval process is what strengthens the memory trace.
How to implement retrieval practice effectively
Low stakes, high frequency. Short quizzes at the start of every lesson outperform big tests at the end of every topic. Five questions in five minutes is the sweet spot.
Space it out. Questions from last lesson, last week and last month are more effective than questions only from the most recent content. This is spaced practice, and it compounds over time.
Mix the formats. Multiple choice, short answer, and fill-in-the-blank each engage retrieval slightly differently. Variety prevents students from gaming the format.
Feedback is essential. The quiz is only effective if students find out what they got wrong and why. Delayed feedback — at the end rather than immediately — is often more durable.
Using AI to build quiz banks
The practical barrier to regular retrieval practice is time. Creating five varied questions per lesson across thirty topics is a significant investment. Pencil's Quiz Creator generates these banks in seconds, removing the barrier entirely.
Try the tools mentioned in this article
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