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I plus 1
i+1 is a principle of language learning which involves quantifiying what is known and adding a small amount of additional information in order to ease into understanding the additional information. In this principle, "i" refers to what is known and "+1" refers to what is unknown. The concept of i+1 is derived from Stephen Krashen's input hypothesis, but is often applied to spaced retrieval software to refer to new information on a given card, such as a single new vocabulary word per card. When used in this fashion, it may be written as i+N. The shared Anki plugin, MorphMan, allows Anki users to keep track of known vocabulary words in their decks and sort cards by the number of unknowns with the iPlusN feature.