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The highlighted time interval is the duration until the user is tested again on the question. Questions start out with the time interval “in-text”, meaning the user is being tested as they read the essay. That rises to five days, if the user remembers the answer to the question. The interval then continues to rise upon each successful review, from five days to two weeks, then a month, and so on. After just five successful reviews the interval is at four months. If the user doesn’t remember at any point, the time interval drops down one level, e.g., from two weeks to five days.


This takes advantage of a fundamental fact about human memory: as we are repeatedly tested on a question, our memory of the answer gets stronger, and we are likely to retain it for longer

! What are novel uses or Spaced Repetition?


With the time taken to review a typical question being just a few seconds, that means a user can achieve long-term recall with no more than a few minutes’ work. By contrast, with conventional flashcards it takes hours of review to achieve the same durability. Exponential scheduling is far more efficient.