# Glossary:Retrievability

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- retrievability
- one of the two variables describing memory traces in learning (the other is stability).
**Retrievability**is most often expressed as the probability of recall.**Retrievability**is subject to negatively exponential decline whose speed depends on memory stability. Stability is often expressed as the optimum interval for the forgetting index equal to 10%. This term was proposed by Wozniak, Gorzelanczyk, and Murakowski (1995) to help differentiate memory stability from the imprecise and all-encompassing term*memory strength*. See: Two components of long-term memory