The Leitner System for Readers: Turn Book Highlights Into Lasting Knowledge | Chapterly Blog
The Leitner System for Readers: Turn Book Highlights Into Lasting Knowledge Quick Answer: The Leitner system sorts your book highlights into boxes based on how well you remember them. New or difficult highlights go in Box 1 (reviewed daily). Each time you successfully recall a highlight, it moves to the next box with a longer review interval. Miss one, and it drops back to Box 1. This simple sorting mechanism automates the hard part of spaced repetition: deciding what to review and when. Sebastian Leitner was not a neuroscientist. He was a German science journalist who, in 1972, published a slim book called So lernt man lernen ("Learning to Learn") that introduced a deceptively simple idea: use physical boxes to sort flashcards by difficulty, and let the box number determine how often you review each card. The method caught on because it required zero understanding of memory science. You did not need to calculate optimal intervals or track review dates. The boxes did the thinking for you. A card you kept getting wrong stayed in the first box and showed up every day. A card you knew cold migrated to Box 5 and appeared once a month. Fifty years later,...