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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