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Retrievability of memory is a variable of long-term memory that determines the probability of retrieving a memory at any given time since the last review/recall.

Stability (S) and Retrievability (R) are part of the Two component model of long-term memory and the DSR model.

Dr Robert Bjork arrived at the concept of retrievability independently and named it retrieval strength.

See: Retrievability of memory

This glossary entry is used to explain SuperMemo, a pioneer of spaced repetition software since 1987