He continued to refine the ideal intervals for keeping his English sharp, and programmed a computer to track his progress. “These optimum intervals are calculated on the basis of two contradictory criteria,” he wrote at the time. “Intervals should be as long as possible to obtain the minimum frequency of repetitions, and to make the best use of the so-called spacing effect … Intervals should be short enough to ensure that the knowledge is still remembered.”
Spaced repeetition forklaret
