Few questions in learning research have been studied as thoroughly, or answered as consistently, as this one: does testing yourself on material help more than simply reading it again? Active recall and rereading represent two intuitive but very different ways of revisiting material a person is trying to learn. One asks the brain to retrieve information with no page to lean on; the other lets the eyes pass back over the same words a second or third time. The research gap between them is unusually wide for a comparison like this, even though both remain common study habits.
How Active Recall Works
Active recall involves testing memory of material rather than simply reviewing it, using tools like flashcards, practice questions, or blank-page recall where the learner writes down everything they remember without looking at the source. The process requires converting material into testable prompts in advance, which takes more upfront effort than simply opening a book, but the payoff is a more honest picture of what has actually been learned. Because recall is effortful, it tends to feel less fluent and less comfortable than rereading; a learner struggling to remember an answer may feel like they are doing something wrong, when in fact that struggle is part of what strengthens the memory. The method works across many formats and subjects, and it is particularly suited to material that can be broken into discrete facts or concepts, such as vocabulary, formulas, dates, or definitions, rather than material that is more about general exposure or style.
How Rereading Works
Rereading simply means going over the same material a second or third time, usually by reading it again from the page or screen. It requires essentially no preparation beyond having the material in hand, which makes it the lowest-effort review method available and very easy to fit into any spare moment, whether that is ten minutes on a train or a quiet half hour before bed. This ease comes at a cost: rereading tends to build a sense of familiarity with the material that can be mistaken for genuine understanding, since recognizing something as familiar feels similar to actually being able to recall and use it. Rereading also lends itself to passive reading without much critical engagement, since the eyes can move across a page while the mind wanders elsewhere. It tends to work best as a first pass through brand-new material, before a more active study method takes over.
Potential Benefits
Active recall's primary advantage is retention that holds up over time: because it forces retrieval rather than passive recognition, it tends to reveal gaps in understanding more honestly, and research support for its effect on long-term memory holds up across many subjects and age groups. Rereading's advantage is almost the opposite: it asks very little of the learner, requires no setup, and can build a comfortable, general familiarity with new material before anything more demanding is attempted. For someone encountering a topic for the very first time, that initial exposure through rereading can lay groundwork that active recall alone would struggle to provide, since there is nothing yet to actively retrieve.
Limitations to Consider
Active recall's main drawback is how it feels in the moment: struggling to remember something is less pleasant than smoothly reading it again, and that discomfort can discourage learners from sticking with the method even when it is working. It also requires material to be converted into testable questions, which takes planning, and it offers little direct benefit for material that is not fact- or concept-based, such as absorbing the overall feel of a piece of writing. Rereading's limitation is almost the inverse: its ease of use masks weaker evidence of improving long-term retention, and the comfortable feeling of familiarity it produces can lead a learner to believe they know material better than they actually do, right up until a test or real-world application reveals the gap.
What the Evidence Says
Both active recall and rereading carry a well-studied label, but the two bodies of evidence point in different directions. Roediger and Karpicke's (2006) research, and the substantial body of work that followed it, consistently demonstrates what has come to be called the testing effect: recalling information strengthens long-term retention more effectively than simply rereading it, a finding that has been replicated across many subjects and settings. Dunlosky and colleagues' (2013) comprehensive review of learning techniques went further, rating rereading as one of the least effective common study strategies when measured against active recall and spaced practice, despite its being one of the most commonly used. The strength of the evidence here is unusual for a comparison like this one; rather than a genuinely open question, this is closer to a well-replicated finding about which technique tends to produce more durable memory, even though rereading remains useful for other, more limited purposes.
Who Tends to Use Each Approach
Active recall tends to suit exam preparation and fact- or concept-heavy material, especially for learners aiming for long-term retention rather than short-term familiarity, and who are willing to tolerate a more effortful, less comfortable study session. Rereading may suit a first exposure to brand-new material, short or low-stakes review where deep retention is not the goal, or situations where the aim is general comfort with a topic rather than precise recall of specific details. Many learners use both at different stages: a pass of rereading to get oriented, followed by active recall to actually commit the material to memory.
Making the Choice
Rather than treating this as a contest with an obvious winner, it may help to ask what stage of learning you are actually in. Is this your first encounter with the material, where some orientation through rereading might help before anything more demanding? Or are you trying to retain something well beyond a single glance, in which case the extra effort of active recall may be worth the discomfort it brings? How much time do you have before the material needs to be used or tested? The evidence leans clearly toward active recall for durable retention, but that does not mean rereading has no place in a complete study routine, only that it tends to work best as a starting point rather than a destination.
Sources
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.