Glossary:Forgetting index

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forgetting index
proportion of elements that are not remembered at repetitions (usually expressed as percentage). The forgetting index can be programmed to fall between 3% and 20%. This way, the speed vs. retention trade-off in learning can be controlled by the student. You can set the default forgetting index with Toolkit : Options : Learning : Forgetting index (default) and individual element forgetting indices with Forgetting index in the Element parameters dialog box. To understand the difference between the requested, measured, default, individual, expected and the estimated forgetting index, see: Forgetting index