Joseph Rézeau

... with an odd number of choices?

• For each correct choice: give a score equal to 100 divided by the number of correct choices
• For each incorrect choice: give a score equal to -100 divided by the number of incorrect choices.

See attached sample.

Joseph

Hi Fiona,
In my opinion the scoring system of the multichoice, multiselect question type in Moodle quiz questions is perfectly acceptable. As you have found out, if your question has for example 4 choices, 2 correct and 2 wrong, then correct choices must be given a score of 50% each and wrong choices a score of -50% each... which gives the following scenarios.
Student ticks all four choices: score = 0 (2 x 50% minus 2 x -50%).
Student ticks 2 correct choices: score = 100%
Student ticks 2 wrong choices: score = 0%
Student ticks 1 correct choice plus one wrong choice: score = 0%
Student ticks 2 correct choices plus one wrong choice: score = 50%.
I frankly do not see what else you would consider a "fairer" scoring system.
Joseph
PS.- You might be interested in an excellent explanation of the MULTICHOICE, MULTISELECT scoring logic for the Hot Potatoes software here.

Jérôme > En attendant, Hubert, si la ligne n'existe pas, il faut simplement la rajouter dans la section adéquate.

Je n'aurais pas dit mieux.

Joseph

Paul > So for instance if you log on in English you will get a resource link to an English powerpoint, but if you log on in French you should get a description and link to a French tranlated powerpoint.

I'm afraid you are setting your level of expectation much too high...