Active recall: close the notes, give your brain a turn.

Active recall means trying to retrieve information before you look at the answer. Answering a practice question, explaining an idea with your notes closed, and completing a flashcard are all ways to do it.

Active recall vs rereading

Rereading puts the explanation in front of you. It can help you understand unfamiliar material or correct an error. Active recall removes that support for a moment so you can see what you can produce yourself. A familiar-looking sentence and an explanation you can give unaided are different observations.

In a study using prose passages, Roediger and Karpicke found that taking recall tests supported later retention. This is evidence for retrieval practice, not a reason to skip the initial learning or the feedback afterward. Read the original test-enhanced learning study.

Three active recall exercises

1. The blank-page check

After studying a short section, close it and write the main ideas on a blank page. Draw relationships if that suits the topic. Reopen the source and mark omissions and mistakes in a different color. Pick one of those gaps for your next question.

For a chapter about a historical event, your blank page could include what happened, what led to it, and what changed afterward. Missing an entire relationship tells you where another reading pass might be useful.

2. The explain-it check

Explain an idea aloud as though someone has asked you how it works. Include an example. When you reach a vague phrase such as “it just does,” stop and write down the unresolved question. Check the explanation instead of rehearsing a guess as if it were certain.

3. The question-and-answer check

Turn a useful fact or relationship into a question. Answer it before revealing your notes. For a process, ask both what comes next and why that step is needed. For a concept, ask for an example and a nearby concept it could be confused with.

Flashcards make these prompts easy to collect, but you can use a folded sheet of paper. Put questions on one side and answers on the other.

Make your answers checkable

Before reviewing, decide what a sufficient answer would include. “Explain photosynthesis” leaves a lot unspecified. A narrower prompt, such as asking which inputs a simplified account includes, gives you a clearer result to compare with your source. Use a separate prompt when you want to practice the full explanation.

If you are preparing for an exam, include questions that match its tasks. Recalling a formula alone is different from choosing it for an unfamiliar problem. Keep some practice outside the deck so you can test how the parts fit together.

Check errors, then come back later

After an attempt, compare your answer with a reliable source. Correct the mistake in your own words and test the difficult part again. Leave a future review in your plan with spaced repetition. Repeating an incorrect answer without checking it is not the exercise you are aiming for.