# Glossary:Forgetting curve

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- forgetting curve
- describes the decline in the probability of recall over time. A forgetting curve graph in SuperMemo shows how fast the memorized information gets forgotten. A
**forgetting curve**graph shows time on its X axis, and percent recall on its Y axis. It can be viewed with**Toolkit : Statistics : Analysis : Forgetting Curves**. SuperMemo collects 400**forgetting curves**for 20 levels of knowledge difficulty and 20 levels of memory stability.