Graduated interval recall
- Graduated interval recall
Graduated-interval recall is a type of spaced repetition published by Paul Pimsleur in 1967. [citation
title=A Memory Schedule
first=Paul
last=Pimsleur
periodical=The Modern Language Journal
volume=51
issue=2
month=February
year=1967
pages=73-75
doi=10.2307/321812] It is used in the Pimsleur language learning system and it is particularly suited to programmed audio instruction due to the very short times (measured in seconds or minutes) between the first few repetitions, unlike other forms of spaced repetition which may not require such precise timings.
The intervals published in his paper were: 5 seconds, 25 seconds, 2 minutes, 10 minutes, 1 hour, 5 hours, 1 day, 5 days, 25 days, 4 months, 2 years.
By timing a Pimsleur language program with a stopwatch, it is possible to verify that the intervals are not followed exactly but have upper and lower bounds. A similar principle (graduated intervals with upper and lower bounds) is used in at least one open source software project ( [http://people.pwf.cam.ac.uk/ssb22/gradint/ Gradint] ) to schedule its audio-only lessons.
References
See also
*Spaced repetition
*Forgetting curve
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