Repetition history


Repetition history window

With Learning : Show repetition history (Shift+Ctrl+H) available from the Element menu you can quickly display the history of repetitions for the currently displayed element. Alternatively, double-click the Element data window to open the repetition history of the element.

The exemplary repetition history of an item that has been forgotten at least once in the course of its repetitions

The exemplary repetition history of an item that has been forgotten once (at the 2nd repetition).

Columns in the Repetition history table

  • No - the number of times the element was repeated. (f) to the left of any given repetition number indicates the repetition when the item was forgotten (i.e. you were not able to provide the correct answer) the element at. In the example above, the item was not recalled at the 2nd repetition.
  • Rep - the first figure represents the number of consecutive successful repetitions (when you graded yourself Pass (3) or higher). The other one shows the cumulative number of times you did not remember the element (i.e. your grade was Fail (2) or less) since you first memorized it. Note that each time you forget the answer, the first figure gets reset to 1.
  • Date - the date when you repeated the element, or, when it is scheduled for the next repetition (Next at the top)
  • Hour - the time (hh:mm) when you repeated a given element
  • Grd - the grade that you gave yourself at a given repetition
  • Intrv - the number of days between successive repetitions: the one from the preceding row and the one from the current row
  • Prior - the relative position of the element in the priority queue at the time of the repetition (the lower the number, the higher the priority)
  • AF - element's A-Factor after a given repetition
  • UF - element's U-Factor after a given repetition
  • eFI - element's expected probability of forgetting at a given repetition. In the picture above, the 94% probability of forgetting the item at the 2nd repetition was related to the fact that it was scheduled for repetition only after 33 days since it was first memorized. Expectedly, the student did not remember the item at that time (as indicated by (f) in the No column). The reason behind the unusual over a month long interval between the 1st and 2nd repetition was that student decided to re-memorize the collection when he had resumed the repetitions after a long break and was well-acquainted with a significant portion of the material available in it. By grading himself Bright and Good on newly re-memorized items, he led SuperMemo to believe that the material he was dealing with was relatively easy. As a result, SuperMemo extended the average length of the first interval for the newly memorized items. It was all good and expected until he got to the other part of the collection that he had never memorized before. At that time, long first intervals started to have an adverse effect on his retention. Therefore, it is always recommended that you do not re-memorize the material that you have once learned with SuperMemo but rather use tools available in SuperMemo (e.g. Postpone) to help you recover from breaks in regular learning with the program.

Repetition history context menu

Right-click over the repetition history window opens a context menu with the following items:

  • Close (Esc) - close the repetition history window
  • Copy (Ctrl+C) - copy the element's repetition history to the clipboard
  • Delete (Del) - delete the element's repetition history (after confirmation)


... missing data ... in this example is a result of the fact that the repetition history was collected in SuperMemo only as of 1996, while the presented collection is much older (with 6 repetitions executed before or in 1996). Also, the hour data is missing in older repetitions due to the fact that the repetition hour is registered in repetition history only as of SuperMemo 2006 (hours are used in correlating retention with sleep data available from SleepChart).

SuperMemo: Repetition history dialog box displaying the history of repetitions for the current element