Spaced Repetition: How to Review When You're Busy

What the forgetting curve says

The Ebbinghaus forgetting curve is a well-known concept: new information tends to fade quickly in the first days after you learn it, then more slowly. If you recall it just as it is starting to slip, the memory usually lasts longer than if you leave it alone.

Spaced repetition builds on that. Instead of rereading in one long sitting, you review several times with growing gaps: the next day, a few days later, then a few weeks later. Each time you recall something successfully, the next review can be pushed further out.

Active recall: answer first, check second

Good timing is only half of it. The other half is active recall, which means trying to pull the answer out of your head before you look at it. Rereading notes easily gives you the feeling of "I know this", while answering from memory shows what you really remember and what you do not.

Flashcards fit this well: the front is the question, the back is the answer. The routine is short. Read the front, answer in your head or out loud, flip the card, then judge whether it felt easy or hard.

Making it work when you are busy

You do not need hours a day. A few small habits are enough to start, and they are easy to keep:

• Pick a fixed slot, such as 10 minutes while waiting for coffee or on the bus.
• Add only a few new cards a day, around 5 to 10, so the pile of due cards does not balloon.
• Clear due cards first, then learn new ones.
• If you miss a day or two, just carry on. You do not need to make it all up in one session.
• Ask one thing per card. Shorter cards are faster to review.

Let the app handle the calendar

Remembering which card is due on which day is more tiring than the studying itself, so flashcard software usually calculates the next review date after each rating.

In Fibonacci Review, flashcards use the SM-2 algorithm. You answer, flip the card, then choose Again, Hard, Good or Easy. If you choose Good, the card comes back after 1 day the first time, after 6 days the second time, and after that the gap is multiplied by an ease factor. This is only an example; the real gaps depend on how you rate each card.