...
Some courses use the "Every Decision Counts" method of partial credit for its multi-point problems (checkboxes, multiple dropdowns or fill-in-blanks). Basically, this means is that for every correct checkbox checked, item the learner does right – either checking a correct answer (choosing a correct answer) or leaving an incorrect answer unchecked (not checking a wrong answer) – the learner gets some value added to the total (based on the question's total point value). However, if for every item the learner gets something does wrong -- either having checking an incorrect item checked (select a wrong option) or not selecting a correct item (not choosing a correct answer) -- the score is reduced by a certain value (again based on the question's total point value). This method scores learners more accurately on what they know or don't know, and is more forgiving to the learner than not allowing partial credit or using a "by halves" partial credit method (edX's other option for partial credit).
...