After each repetition, SuperMemo asks the student to produce a grade that is supposed to reflect the accuracy of the provided response.

The grade point scale is defined as follows:

Bright (5), excellent response

Good (4), correct response provided after some hesitation

Pass (3), answer recalled with difficulty; perhaps, slightly incorrect

Fail (2), wrong response that makes you say I knew it!

Bad (1), wrong response; the correct answer seems to be familiar

Null (0), complete blackout; you do not even recall ever knowing the answer

Note, that in SuperMemo you are unlikely to need grades Null (0) or Bad (1).

Having responded to the question, you can specify a grade by choosing one of the actions:

* click the corresponding grade button at the bottom of the element window

* press the corresponding numeric key