It is quite usual to have Measured FI higher than Average FI . The default forgetting index is the requested forgetting index given to all new elements added to the collection. Forgetting index, in general, is the proportion of items that are not remembered during repetitions. The lower the value of the forgetting index the better the element is remembered but the more repetitions will be needed to keep it in memory. Too low forgetting index makes learning too tiresome due to a prohibitively large number of repetitions.
All elements can have their desired forgetting index set individually.
The easiest way to change the forgetting index of a large number of elements is to use Forgetting index option on the pop-up menu in the contents window . Thus the sum of inverse intervals is a good indicator of the total repetition workload in the collection. Workload - the average daily time used for responding to questions in a given collection. Note that this is only the time it takes to answer question. Speed - the average knowledge acquisition rate , i.e. the number of items memorized per year per minute of daily work.