Spaced Repetition
A learning technique based on increasing intervals of review
Spaced repetition is an evidence-based way to schedule review so you practice recall right before you would forget. It leverages the spacing effect and the shape of the forgetting curve: intervals expand when you remember and contract when you do not.
In practice, you learn something, test yourself soon, then revisit it after longer and longer gaps as long as retrieval stays successful. Tools like Anki and SuperMemo automate the interval adjustments, but the core is still retrieval, not repetition.
It is especially effective for large bodies of discrete knowledge and easy to misuse as passive card-flipping. The cards should force genuine recall, not recognition. Combining spaced repetition with interleaving and meta-learning yields a more complete picture of effective study.