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Spaced Repetition

3 min read

Overview

A learning technique that schedules review of material at increasing intervals — reviewing each item at the exact moment you’re about to forget it. Backed by the science of the forgetting curve (Ebbinghaus). The most efficient known method for moving information into long-term memory.

Key Concepts

  • The forgetting curve — without review, ~80% of new information is lost within a week. The curve is steep at first, then flattens with each successful recall.
  • Spacing effect — reviewing material at spaced intervals is dramatically more effective than massed practice (cramming). Each successful recall at the right moment strengthens the memory trace and pushes the next review further out.
  • Active recall over re-reading — testing yourself, even failing, locks material in far better than passive review. The act of retrieval strengthens the memory; re-reading does not. → Active Recall
  • The compound effect — meta-analysis shows that combining spaced repetition with active recall improves outcomes ~25% more than using either strategy alone. They’re not additive, they compound: SR schedules when to retrieve; active recall is how.
  • Anki — the standard tool for implementing spaced repetition. Free, open-source, cross-platform. Algorithm schedules each card’s next review based on how well you recalled it.

How It Works in Practice

  1. Encounter new material → create a flashcard (image-based, not translation-based for language)
  2. Anki presents the card before you forget it
  3. You recall the answer — rate difficulty (Again / Hard / Good / Easy)
  4. Anki schedules the next review: harder cards come back sooner, easy cards are pushed further out
  5. Over time, well-known cards are reviewed infrequently (months apart); difficult ones stay in rotation

Connection to Language Learning

Spaced repetition is the retention backbone of the Fluent Forever system. Without it, vocabulary building is a leaky bucket — words go in, words fall out. With it, every card you add compounds: reviewed less and less often as it solidifies, eventually requiring only occasional maintenance reviews.

Broader Applications

Spaced repetition works for any domain requiring memorisation: medical school (anatomy, pharmacology), law (case law, statutes), music (chord shapes, theory), trading (pattern recognition, rules). The principle is universal — spacing and active recall outperform all passive study methods.

The Comprehensible Input framework challenges the primacy of SRS for intermediate and advanced learners. Past the beginner stage, one hour of reading/listening provides thousands of contextual encounters vs. ~150 SRS reviews — and each contextual encounter updates a broader network. SRS remains valuable early and for isolated fact sets, but its efficiency advantage diminishes as the learner’s network grows. See Comprehensible Input for full analysis.

Self Development connection

The spacing effect is a lesson in compounding: small, consistent effort distributed over time outperforms large bursts. The same principle applies to habits, skills, and relationships — regular engagement beats periodic intense investment.

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