How often should new material be reviewed for optimal retention?
New material should be reviewed within 24 hours of learning, followed by reviews at intervals of 3–5 days, then 1–2 weeks, and finally at 1 month. This spaced repetition schedule helps to reinforce memory traces and combat the forgetting curve.
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This is one answer. The complete system — the psychology, the biology, and the method — is in the book.
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