Multiple choice grading (QCM) answer options with the annotated template are not consistently applied during grading

[sderrien]

The annotated question template

The grading choice corresponding to Q3 shows options that are not present in the template (.

More broadly, is it expected that changes in the answer regex be immediately applied to the grading at hand ?

[barais]

The best for QCM is to select for a first try just the place where you get the square.

You can enlarge it later before sending result to student.

[sderrien]

My description was probably not very clear. The problem is that I observe choices (c, e, d, a & e) for grading for which I have no idea where they come from (on the template, I only allow one valid expression (c) )

[barais]

Yes, your description was clear. But it means that in analysing the template, the qcm algo found 5 square (that is why it could be a good idea to reduce the search space for square in creating a smaller zone, you could increase it later).

The qcm algo is simple: 1: search square in template from question zone. 2: search empty square in scan for the zone where it detect square in template 3: perform a new alignment based on the match of void square. 4: compare the density of the square zones in the scan for each copy. 5: send the answer.

That is why, if it creates a 'e' comment. It means that it detect 5 squares

Regards

Olivier

[sderrien]

OK, now I get it.

Then I have two suggestions :

• (optionnally) ask the user to specify the number of distinct check-boxes to allow early detection of inconsistencies in the template.
• an option during the grading process to "enlarge" by 20% the answer area to accommodate with poorly aligned scans (I agree one can switch to the whole page but this can be cumbersome)

Regards,

Steven