Spaced repetition is a review schedule. You see a fact again after a gap, and the gap grows when you still know it. The aim is not to repeat more. It is to repeat at the moment when the memory is about to slip, which is when a review does the most work.
What spaced repetition is
If you review a word ten times in one sitting, the last nine reviews feel easy and add little. If you never review it, you will often fail to recall it a week later. Spacing spreads the same effort across days. Each successful recall lets you wait longer before the next one.
A flashcard system that uses spaced repetition keeps a queue. New and shaky cards come back soon. Familiar cards come back after longer gaps. You open the app, study what is due, and stop. You do not pick favorites from the pile.
Why increasing intervals help
Recall gets stronger when it almost fails and then succeeds. A review that happens too early is a glance. A review that happens too late is a relearn. The interval in between is the useful one. Because that moment is different for every card, a single weekly cram session cannot match a schedule that moves each card on its own.
Forgetting is part of the method. A miss means the gap was a bit long, or the card is unclear. The next interval should be shorter. The miss is data, not a reason to abandon the deck.
A schedule you can follow
You can space reviews with paper if the set is small. For a new word, a workable hand schedule is:
- Same day, a few hours after you first studied it.
- The next day.
- Three days later, if you recalled it.
- A week later, if you recalled it again.
- Then every two or three weeks, while you still know it.
If you miss, go back to the start of that ladder for that word only. Do not reset the whole deck. An app does the same thing with finer steps: one button for “I knew it” lengthens the gap, and one for “I missed it” shortens the gap. The labels differ. The decision is the same. Answer first, then grade yourself honestly.
What belongs on the card
Spacing cannot rescue a card that asks the wrong question. Put one fact on each card. A word and one sense, a collocation, or a sentence with a blank is enough. A card that asks for three translations, a grammar rule, and a synonym will fail often for reasons that have nothing to do with the interval.
Write the prompt so you must retrieve the word, not merely recognize it. Showing the foreign word and asking “do you know this?” invites a nod. Showing your language, a definition, or a sentence with a gap asks you to produce something. Production is slower and more useful. The guide to flashcards goes through card formats in more detail.
How long a session should be
Stop when the due cards are done, or after about fifteen to twenty-five minutes, whichever comes first. A huge due pile means too many new cards earlier in the week. Add fewer new words tomorrow and clear reviews first. New cards are optional. Due reviews are the point of the schedule.
If you miss a day, do not “catch up” by grading cards you did not really recall. Study what fits in one sitting, starting with the cards that are most overdue or newest. The rest can wait until tomorrow. A shorter honest session keeps the intervals meaningful.
Common mistakes
- Adding new cards every day and ignoring the reviews those cards create a few days later.
- Pressing “I knew it” after you peeked, which stretches the interval and hides the miss.
- Turning every miss into a long reread instead of one more recall attempt.
- Keeping a card you fail for a week without rewriting the prompt. See the section on repairing cards in how to learn new words.
- Studying only when you feel motivated. The schedule works because it is small enough to do on ordinary days.
Use it in Wordmemo
Wordmemo Flashcards schedules reviews for you. You create a collection, add a card with the word and an example, and study the cards that are due. Progress stays with your account on the web and in the mobile apps, so the queue is the same device to device.
Start with one collection and a handful of cards you can already imagine using. Study the due set once a day. When that feels routine, add a few new cards. The tool is the queue. The learning is still the moment you answer before you look. Open Wordmemo Flashcards when you are ready to put a real set on a schedule.