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The German science journalist Sebastian Leitner described the system in his 1972 book So lernt man lernen ("How to learn to learn"). It's one of the earliest practical versions of spaced repetition: rather than flipping through the whole deck every time, you review each card on a schedule that depends on how well you know it.
How the boxes work
- Set up three to five boxes (or piles, or folders). Every new card goes in box 1.
- Review box 1 every study day. Answer each card before flipping it.
- Right answer: the card moves up one box. Wrong answer: it goes back to box 1, no matter which box it came from.
- Review higher boxes less often. A common schedule is box 1 daily, box 2 every two or three days, box 3 weekly, box 4 every two weeks.
- A card that makes it through the last box is learned. Pull it out, or keep it for a final review before the exam.
Why sending misses back to box 1 matters
The reset rule is what separates the Leitner System from going through the deck in order. A card you missed doesn't get to coast in box 3 just because you knew it last week. It goes back to daily review until you've proven you know it again. That's uncomfortable, and that's why it works: most of your time goes to the cards you'd otherwise get wrong on the test.
Where paper boxes get hard
- Making the cards takes longer than reviewing them, especially from a long lecture.
- Keeping track of which box is due on which day takes discipline.
- It's easy to cheat by moving a card up when you "basically" knew it.
A digital version with Studi
Studi's flashcards follow the same idea, with four ratings instead of physical boxes. Upload your notes, slides, or a PDF and Studi makes the flashcards from that material. After each card you rate it. Cards you rate Unfamiliar come back in about ten minutes, Learning in a few hours, Familiar after at least a day, and Mastered after at least three days. Each time you rate a card Familiar or Mastered again, the wait gets longer. Rating a card Unfamiliar resets it, just like sending it back to box 1.
For the reasoning behind the schedule, read our guide to spaced repetition. For why answering before you flip matters, see active recall.
Questions students ask
How many boxes should the Leitner System have?
Three to five is typical. Three is enough for a short unit; five works better for a large deck you'll keep for a whole course.
How often should I review each Leitner box?
A common schedule is box 1 every day, box 2 every two to three days, box 3 weekly, and box 4 every two weeks. Shorten it if your exam is close.
Is the Leitner System the same as spaced repetition?
It's an early, simple version of spaced repetition. Apps like Studi use the same idea with per-card intervals instead of fixed boxes.
Keep studying
More study methods
- Best for: Understanding concepts, not just memorizing themFeynman TechniqueExplain it simply, find where you get stuck, go back to the source, and try again. Here's how to run the Feynman Technique on your own class material.
- Best for: Math, science and mixed-topic examsInterleavingDoing twenty problems of the same type feels productive. Mixing them up feels harder and works better on the test. Here's why, and how to interleave your own practice.
- Best for: Getting started and staying focusedPomodoro TechniqueTwenty-five minutes on, five minutes off. The timer is the easy part. Here's how to plan what goes in each block so the time turns into actual studying.
Use this method on your own material.
Upload the notes, slides or reading you're studying, and Studi turns it into flashcards, notes and practice questions.
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