# Spaced repetition

Spaced repetition using flashcards is one of the most effective methods to memorize things. If you want to learn more about it, you can start on [article on Wikipedia](https://en.wikipedia.org/wiki/Spaced_repetition) or check out [this wonderful comic strip](https://ncase.me/remember/) from Nicky Case.

### Recall level <a href="#recall-level" id="recall-level"></a>

Every card detected in your notes has a so called “recall level” associated with it which indicates how well you remember it. It also represents the number of days after which it will be queued for review again.

### Multipliers <a href="#multipliers" id="multipliers"></a>

When you are testing yourself, the recall level changes based on how well you remember the card. The theory is simple - if you remember it well the recall level goes up, otherwise it goes down.

**Recall** uses a simple algorithm and multiplies the current recall level by a constant and there’s a constant defined in your configuration for each of the review results. By default, these constants are 2, 0.5 and 0, which in practice means that

* if you click Remembered, the recall level will be doubled;
* and if you click Struggled, the recall level will be halved;
* if you click Forgot, the recall level will go back to 1 (minimum value).