Pimsleur Graduated Interval Recall
An early audio-based spaced repetition schedule proposing intervals of 5 seconds, 25 seconds, 2 minutes, 10 minutes, 5 hours, and so forth.
A discrete graduated-interval recall schedule published by linguist Paul Pimsleur in 1967 designed to combat the immediate exponential drop of the Ebbinghaus forgetting curve during audio-lingual instruction.
Historical & Empirical Context
Published in 1967 in 'A Memory Schedule', Pimsleur's work was the first mass-market application of spaced repetition, later superseded by computerized adaptive models (SM-2, FSRS-5).
Core Principles & Mechanics
Short micro-intervals (seconds to minutes) during the initial acquisition session prevent immediate decay.
While Pimsleur used fixed static intervals for all words, modern FSRS-5 adapts intervals dynamically per user and per card difficulty.
In Practice
Pimsleur's four intervals (5s, 25s, 2min, 14min) were a 1967 heuristic for audio courses; FSRS-5 personalizes the same idea per card.
Graduated intervals answered 'when?' for the average learner; modern SRS answers it for your specific memory trace.
Audio-first learners can still use Pimsleur pacing: replay a new phrase after 5 seconds, then again after half a minute.
Fixed intervals cap out around day 14 β beyond that, stability-based scheduling is the only way to reach multi-month horizons.
Blend both: use graduated seconds inside a session for pronunciation, FSRS-5 across days for retention.
Frequently Asked Questions
How is FSRS-5 different from Pimsleur?
Pimsleur uses static predetermined intervals for every learner, whereas FSRS-5 dynamically computes individualized memory stability curves based on personal review history.
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