Forgetting index

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Forgetting index is the percent of elements that are not remembered at the time of repetition.

The requested forgetting index can range from 3% to 20%. The measured forgetting index may fall in between 0% and 100% and is usually slightly higher than the requested forgetting index (due to rounding errors, and user delays in making repetitions).

The higher the forgetting index (up to a certain level), the less you remember, but the faster you learn. When forgetting index goes beyond 20-40% (depending on circumstances), both recall and the speed of learning suffer.

See also:

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