How many times does SuperMemo ask you a given question?
” and the answer is “Several times in the future (e.g. 10 times in a lifetime)”. A better answer would be: “On the day before you are most likely to forget the answer” Answer: This answer would not be correct. This is true only in special cases (for example, forgetting index 10% and the optimum interval 10 days). Usually, the repetition takes place after the day of maximum forgetting probability. The catch is that this maximum probability is very low (e.g. less than 1% for intervals longer than one year and the forgetting index 10%). The repetition takes place on the day when the probability of failure equals the forgetting index. It is important to distinguish between the probability that forgetting will occur on day X (a very low value), and the probability of failure on the repetition day X (equal to the forgetting index on the day of the optimum repetition). The former often reaches its maximum before the day of the optimum repetition. The later is always increasing in time (i.e. m
