Psychology · Applicable across all session lengths, particularly for multi-week or spaced learning campaigns

New Theory of Disuse

A cognitive model of memory that distinguishes between Storage Strength (how well-learned and durable a memory is) and Retrieval Strength (how accessible or easy to recall a memory is at any given moment). It explains the mechanics of learning decay, rapid relearning, and why immediate recall does not equal permanent mastery.

When to use New Theory of Disuse

Highly effective when designing spaced reinforcement campaigns, planning refresher training, diagnosing learning decay, and designing retrieval-based assessments.

How New Theory of Disuse works

Facilitators can use this to structure reinforcement schedules. By waiting until retrieval strength has decayed (e.g., after a delay), subsequent restudy or testing provides the maximum possible boost to storage strength.

Phases of New Theory of Disuse

  1. High Storage / High Retrieval (Fully Mastered & Accessible): Knowledge is both well learned and easy to recall now. Facilitators keep it alive with occasional spaced retrieval and use it as a base for new learning.
  2. Low Storage / High Retrieval (Short-term Fluency / Crammed): Something feels known because it was just studied, but it will fade fast. This is the fluency trap after a lecture; facilitators counter it with spaced practice, interleaving and quizzes that make recall harder.
  3. High Storage / Low Retrieval (Latent Knowledge / Forgotten but Relearnable): Knowledge is still well stored but hard to access right now. It can be relearned quickly, and effortful retrieval here strengthens storage most; facilitators use recall prompts and refresher practice.
  4. Low Storage / Low Retrieval (Unlearned or Completely Lost): The material was never learned properly or is effectively gone. Facilitators treat it as new learning and design desirable difficulties from the start rather than simple repetition.

Key principles

  • Storage strength is virtually permanent, whereas retrieval strength is highly volatile and decays over time.
  • The lower the current retrieval strength of an item, the greater the boost to its storage strength when it is successfully retrieved or restudied.
  • High immediate retrieval strength limits the potential growth of storage strength during restudy (e.g., rote repetition has diminishing returns).
  • Relearning forgotten information with high storage strength is exceptionally rapid compared to learning new information.

Best for

  • Spaced repetition design
  • Refresher training
  • Memory retention strategy

Considerations

  • Learners and facilitators often mistake high retrieval strength (current fluency) for high storage strength (permanent learning).
  • Requires tracking learning intervals to target the sweet spot of low retrieval strength without complete forgetting.
  • Harder to measure storage strength directly without delayed testing.

Attribution & sources

Developed by Robert A. Bjork and Elizabeth L. Bjork, 1992

Primary source

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