The testing effect is the finding that retrieving information through a test, quiz or self-test improves long-term memory for that information more than spending the same amount of time restudying it.
How it works
We usually think of tests as measurement: a way to find out what someone has learned. The testing effect shows that tests are also a way to learn. When you answer a question from memory, you strengthen the memory you retrieved and make it easier to access again. Restudying does not require that effort, so it has less effect on later recall, even though it often feels more productive.
The effect is strongest when tests require you to generate answers, when you get feedback, and when testing is repeated over time. It is the research basis for retrieval practice and the habit students call active recall.
How to use the testing effect (steps)
- Replace some rereading with quizzing. After a first read, switch to questions.
- Use low-stakes tests. Flashcards, end-of-chapter questions and self-made quizzes all count.
- Prefer recall over recognition. Short-answer and free-recall questions generally help more than multiple choice, though both help.
- Check your answers. Feedback is important, especially for wrong answers.
- Repeat on later days. Spaced tests beat one test.
- Finish with full practice tests under exam conditions.
Common mistakes
- Testing only right before the exam. The effect is strongest when tests are repeated and spaced over weeks.
- Peeking at the answer too early. If you look before you have genuinely tried, the retrieval benefit is lost.
- Ignoring wrong answers. Mistakes are the most useful part of a test when you review the feedback.
- Using only easy questions. Questions you always get right add little; include some that stretch you.
Evidence
Early studies include Gates (1917), who found that students who spent more time reciting material from memory remembered it better than those who spent more time reading. Roediger and Karpicke (2006), in Psychological Science, found that students who took a recall test on a prose passage remembered more of it after a week than students who restudied it, although restudying produced slightly better performance after five minutes and made students more confident. Karpicke and Roediger (2008), in Science, showed that repeated testing rather than repeated studying drove long-term retention. Meta-analyses by Rowland (2014) and Adesope, Trevisan and Sundararajan (2017) found a consistent benefit of testing over restudying across many studies and materials.
Using the testing effect with Duetoday
Duetoday turns your lectures, PDFs and videos into practice tests with explanations and flashcards with spaced repetition, so every study session can be a low-stakes test. When a question shows a gap, ask Galileo to explain the answer using your own material, then test yourself again.
