Let me try:
- As we know, the first learning step is applied to cards whose first rating is
again
. And the second learning step is applied to cards whose first rating isgood
. The average of the 1st and 2nd steps is applied to card whose first rating ishard
. - The stability of
Again
is recommended setting as the 1st learning step if your desired retention is 90%. And if the stability ofGood
is less than 0.5d and you are using the default desired retention, the 2nd learning step can be set as the stability ofGood
. - If the stability of
Hard
is less than the average of stabilities ofAgain
andGood
, I recommend lowering the 2nd learning step to 2x stability ofHard
to ensure you have 90% retention on cards whose first rating ishard
.