The basic principle of
The purpose of the test is to repeat the cards, and to control the progress of learning in a feedback loop.
The purpose of the drill is to learn new cards, and to learn those cards better which you did not remember correctly or only with trouble during the test. You can manually add more cards to the drill list. You start the drill procedure also from the database list. You rate your own answer in the drill on a scale with 2 grades. Every card will be repeated until you can answer it correctly. As with the test, you may interrupt the drill procedure at any time and continue it later.
Committing a card to the learning process will add it to the drill procedure at once. After one or two days the card begins to appear in the test. Uncommitting a card will delete its learning data.
Difficulty: The difficulty of a card is calculated from the rating history of the answers. Only the ratings in the test are taken into account; the ratings during the card drill have no effect on the calculated difficulty of a card.
Repetition interval: This is the interval between two repetitions of a card in the test procedure.
The repetition interval of a card grows as long as the card is remembered correctly. A wrong answer will
start a new cycle with a short initial interval. The repetition interval of a card grows according to the card's difficulty fast or slow,
and can even be as long as several years.
The learning data of a card are displayed in the card's properties.