Quiz

That's strange, i've done exactly that 3 times in the past 2 weeks and it worked fine?

I vaguely remember there being a bug with this in the past. Are you using the latest version?

I am experiencing exactly this same issue.  We are running 1.5.2.

The behavior, as I understand it, can be described as follows:

1. For every quiz, the number of that attempt (not as in unique id, but as attempt #1, attempt #2, etc., for that quiz) is stored in the "attempt" field in the mdl_quiz_attempts table.
2. It seems that, when Moodle checks whether or not a student is eligable for another quiz attempt, it queries only the MAX value of all the student's "attempt" fields.  So, two possible behaviors follow, assuming the student had used all his previous attempts:
   1. The teacher has deleted his most recent attempt, and therefore, MAX(attempt#) would be less than the total permitted for that quiz, and he can reattempt.
   1. The second scenario is when the teacher deletes an attempt that was not the most recent attempt.  In this case, MAX(attempt#) is still the same as the maximum value permitted for that quiz.

The more appropriate behavior would be to actually query the number of attempts that a student has, and not the highest value of that attempt field, assuming that we want the behavior of a teacher deleting a quiz attempt to allow more attempts - which I think is the most intuitive behavior, from my perspective.

I will search the bug reports and the changelog for 1.5.3 and see if this was address in either.  If not, then I'll try and fix it myself...and maybe someone can show me how to submit a patch, if anyone else wants this fix.

Excuse me for the ignorant question, but how do you do it to allow a student to retry with a quiz?

I have a placement test that uses the quiz module and some students have clicked on the submit and quit button and now they cannot access the quiz again. What is it that I'm supposed to do to allow them to re-take the quiz?

Josep M.