spaced repetition
Spaced repetition is a learning technique in which increasing intervals of time are used between subsequent reviews. Alternative names include expanding rehearsal, graduated intervals, repetition spacing, repetition scheduling, spaced retrieval and expanded retrieval.
Applications
Practical applications of spaced repetition were first suggested in the book Psychology of Study by Prof. C. A. Mace in 1932.
Pimsleur language courses use spaced repetition techniques, and in the 1970s Sebastian Leitner devised his Leitner system, an all-purpose system based on flashcards.
More recently, spaced repetition has also been implemented into computer-assisted language learning software to gradually adapt the optimum spacing of repetitions to individual needs. A typical optimization criterion used in spaced repetition is the requested level of knowledge retention, i.e. percent of knowledge that is to be remembered.
There are several families of algorithms for scheduling spaced repetition:
 Neural networks based
Sebastian Leitner system learning machines:
*5 stages
*n stages
SM-family of algorithms (SuperMemo):
*SM-0
*SM-2
*SM-4
*SM-5
*SM-6
*SM-8
*SM-11
The precise length of intervals does not have a great impact on algorithm effectiveness, as reflected in data collected by Mnemosyne.[Peter Bienstman on Mnemosyne mailing list, May 2008]
Prominent researchers
Cecil Alec Mace
Hermann Ebbinghaus
Paul Pimsleur
Sebastian Leitner
Piotr Wozniak
Software
See
See also
Study Software
Testing effect
Spacing effect
Graduated interval recall (System developed by Paul Pimsleur)
References
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