Tool/Memory and Learning/No. 1026
Testing Effect
The testing effect is the gain in later memory from recalling material rather than studying it again. Studied in psychology by Henry Roediger and Jeffrey Karpicke, it is the benefit of retrieval practice, often clearest after a delay and enhanced by feedback.
Also called Retrieval Practice · Testing Effect (Retrieval Practice)
- Evidence
- Well established
- Read
- 6 min
- Links
- 10 connections
- Useful when
- Learning and memory · Risk and safety
01You've seen this when…
- in life
Your language app shows a word and you recognize it immediately. Later, ordering lunch, you can’t produce it. You switch to practicing from the English prompt without seeing the answer.
- at work
Everyone follows the incident-response presentation. A week later, a practice scenario asks which team to contact first, and half the room reaches for the slides.
- out in the world
A science teacher starts class with three questions about last week’s lesson. Students answer from memory, compare their answers with the explanation, and correct what they missed.
02The idea
A page can look familiar without being available when you need it. While reading, the words supply much of the support. Close the page and you discover what you can bring back yourself.
That attempt does more than reveal what you know. Retrieving information can strengthen your ability to retrieve it again. The testing effect is the improvement in later memory caused by practicing recall, compared with spending that time studying the material again.
Testing here doesn’t mean grades, supervision, or a formal exam. It can mean answering a flashcard, writing a blank-page summary, explaining a process without notes, or solving a problem before checking the solution. Retrieval practice is the activity; the testing effect is its benefit.
Several processes probably contribute. Recall can help organize information while strengthening access to it and connecting it with useful cues. Checking your answers also exposes gaps that familiarity hides. Gap-finding is one contributor to the effect. Experiments also find benefits when learners receive no feedback.
The advantage usually becomes clearer after a delay. Rereading can produce better performance immediately while leaving less available days later. Ease during study and durability afterward are different things.
03How to use it
- Study enough to have something to retrieve. Read the explanation, watch the demonstration, or work through a solved example. Retrieval practice supplements instruction; it doesn’t replace it.
- Remove the answer before responding. Close the notes or hide the back of the card. Write, speak, draw, or perform what you remember. Seeing an answer and thinking you would have known it skips the recall attempt.
- Ask for the performance you’ll need later. If you need to explain a process, explain it. If you need to diagnose a fault, use a practice case. Fact cards help with facts; rehearsing judgment requires practice using those facts. This is transfer-appropriate processing: practice the kind of thinking the later task requires.
- Check and correct your answer. Compare it with a trustworthy source. Check for missing steps and wrong claims even when the answer feels close. Then put the answer away and try again. Feedback is especially valuable after errors.
- Adjust difficulty when failure repeats. If you draw a complete blank, use a cue or briefly restudy. If every answer comes instantly, increase the delay or use a less helpful prompt. A desirable difficulty should require effort without making success nearly impossible.
- Return after a delay. Revisit the material tomorrow and later in the week, adjusting the intervals to your needs. Spacing and retrieval are distinct tools that work well together. Mix older questions with new ones to keep yesterday’s lesson in practice.
Keep practice low-stakes. Judge its success by what you can do next time, even if today’s score is unflattering.
04A worked example
In a 2006 experiment, Henry Roediger and Jeffrey Karpicke had students learn short prose passages. Some students studied a passage twice. Others studied it once, then spent the next period writing down what they could remember without looking at it.
What it looks like The students who study twice get more exposure to the correct material. The students recalling it spend some of their time struggling, leaving things out, and producing incomplete answers. Extra reading seems the safer investment.
What’s actually going on On a final test five minutes later, repeated study produces better recall. But on tests two days or a week later, the earlier recall practice produces better recall. Extra study favors immediate performance; recall practice better preserves the material.
What made it work Students had to retrieve the passage without its support, and the researchers measured what remained after a delay. Students practiced recall without corrective feedback, showing that retrieval itself contributed. For everyday learning, adding feedback helps learners catch and correct errors.
The practical lesson is to combine reading with recall during a limited study session, especially when you need the material next week rather than in five minutes.
05When to reach for it
06When it misleads
- You confuse memory with understanding. Reciting a definition demonstrates recall; applying it provides evidence of understanding. Include explanation, comparison, and unfamiliar examples. Otherwise practice can leave an illusion of explanatory depth intact.
- You make every question impossibly hard. Judge difficulty by whether it helps learning. Repeated blanks call for supportive changes: instruction, smaller steps, or better cues.
- You leave mistakes uncorrected. Attempted answers can contain errors. Check uncertain responses to keep a plausible error from becoming your default.
- You practice only the exact cards. You may become dependent on a card’s exact wording to recall the idea. Change prompts and include applications. Benefits can transfer, but distant transfer to very different tasks is not guaranteed.
- You dismiss all recognition questions. Multiple-choice practice can help too, especially with feedback. Free recall often demands more retrieval, and both formats can support learning.
- You turn practice into a high-stakes judgment. Constant grading can discourage honest attempts and make scores the goal. Keep learning opportunities separate from consequential evaluations where possible.
07Roots
In 1917, psychologist Arthur Gates investigated a familiar schoolroom activity: recitation. Students read a lesson, then tried to reproduce it from memory. Gates divided study time between reading and reciting, using material that included short biographies. He wanted to solve a practical problem: with limited time, how much should a learner spend looking at the material, and how much recalling it?
His work suggested that recitation could both contribute to learning and display its results. The idea had an awkward implication for education: a test could measure memory and change it at the same time.
Nearly a century later, Roediger and Karpicke at Washington University in St. Louis made that implication vivid with prose passages and delayed tests. Their 2006 experiments contrasted the short-term advantage of additional study with the longer-term advantage of retrieval. Subsequent research examined how question formats and feedback shaped the effect and how it worked in classrooms. What traveled into teaching as retrieval practice was a different role for questions in existing formats: helping students learn before anyone decides how much they know.
08How solid is this?
Supported by controlled experiments, meta-analyses, and classroom research. Benefits are clearest on delayed tests and vary with retrieval success, feedback, question format, and what the later task requires.
09Connections
- Helps counter Overconfidence Effect, Illusion of Explanatory Depth
- Part ofTransfer-Appropriate Processing, Desirable Difficulties
- Includes Feynman Technique
- See also Cognitive Offloading, Learning Transfer, Metacognition, Spacing Effect, Worked-Example Effect
10Origin and sources
Arthur Gates studied the learning benefits of recitation in 1917. Henry Roediger and Jeffrey Karpicke’s 2006 experiments helped establish retrieval practice as a widely used learning technique.
- [1]Gates, A. I. (1917). Recitation as a factor in memorizing. Archives of Psychology, No. 40.
- [2]Roediger, H. L., III, & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
- [3]Rowland, C. A. (2014). The effect of testing versus restudy on retention: A meta-analytic review of the testing effect. Psychological Bulletin, 140(6), 1432–1463.
- [4]Agarwal, P. K., Nunes, L. D., & Blunt, J. R. (2021). Retrieval practice consistently benefits student learning: A systematic review of applied research in schools and classrooms. Educational Psychology Review, 33, 1409–1453.
Suggest an edit· Updated 2026-10-02