When you grade a card, you are evaluating how well you remember the answer
*right
then*, NOT trying to guess what the algorithm will or should do with it in
the future.
Don't be concerned about giving a card exactly the right grade; if you
grade it too high or low, the difference in interval to the next time it is
shown will be only a few days anyway, so not a crucial difference. When you
see it again, you will then find how well you really know it, and can
adjust the grade accordingly. Over time, and if you grade according to your
current memory, the algorithm will continue to adjust so it shows each card
at just the right interval to prevent forgetting the answer. You may want
to Google "spaced repetition" or SRS to understand this better.
Here are some ways to think of the grades (I have compiled these from
various sources). Note that grades 0-1 are for answers you really can't
remember, while grades 2 and above are answers you can remember, even if
not clearly. So 1 --> 2 is a dividing point indicating a transition from
short to long term memory.
0 A is entirely unknown.
1 A is vague, fuzzy; you can't remember the A.
-------
2 Probably about 2 days until you forget the A.
You "almost" got it. When you saw the A, you thought "I knew it!"
3 Significant effort to remember the A.
You got the A, but it was hard and maybe your understanding was a bit
off.
Last interval was too long.
4 Some effort to remember the A.
You got the A, but you found it somewhat challenging, not quite easy.
Last interval was about right.
Over time, this should be the most common grade.
5 No effort to remember the A; it is easy.
Last interval was too short.
== Effect of grades ==
0-1 Keep asking until I can answer with 2+.
These cards are not scheduled ("not memorized").
-------
2 Move card --> into schedule ("memorized").
3 Next interval will be shorter.
4 Next interval will be equal.
5 Next interval will be longer.
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