[LON-CAPA-users] another instance of correct answer apparently being unaccepted...

Mills, Douglas G dmills at illinois.edu
Tue Sep 23 09:39:44 EDT 2014

I'm now up to three out of four students with this problem were using
laptops with trackpads. Haven't heard back from the fourth. Definitely
seems to be a factor in what is happening here. I know the most recent was
drop down questions (option response - matching) type questions and I
believe that slight movement of a finger on a trackpad can change the
answer of a recent drop down selection... I'm not sure how that results in
a double submission though.


Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmills at illinois.edu
(217) 244-5739

On 9/15/14, 11:22 AM, "Mills, Douglas G" <dmills at illinois.edu> wrote:

>The two students who got back to me on my follow-up question about this
>both report having been using a touchpad on their laptop when the problem
>Douglas Mills
>Director of Instructional Technologies
>Department of Chemistry
>University of Illinois
>dmills at illinois.edu
>(217) 244-5739
>On 9/12/14, 1:43 PM, "Rex Abert" <ABERTR at tcc.fl.edu> wrote:
>>I have been experiencing similar situations, and I'd like to throw in my
>>2 cents.  For me, I was getting internal errors (bombs) when a student
>>submitted a correct response.  I would see a submission that is graded
>>correct, followed by another submission causing the error.  What I
>>noticed from Doug's and mine is the identical time stamp on the offending
>>I have place screenshots at
>>I asked the student if she was using a mobile device, and she replied
>>that is was a laptop, but that she was using the touchpad instead of the
>>My suspicion is that touch devices are not being handled adequately.
>>When a mouse is used, the events fired are mousedown, mouseup, and
>>With a touch device, the events touchstart, touchmove, and touchend are
>>fired in addition to the mouse events.  I'd wager that the "touchmove" is
>>what is causing a different option for Doug's student to be selected in
>>addition to the correct selection.
>>I hope that this speculation might turn out to be useful.
>>Rex Abert
>>Assistant Professor of Mathematics
>>Tallahassee Community College
>>From: lon-capa-users-bounces at mail.lon-capa.org
>>[lon-capa-users-bounces at mail.lon-capa.org] on behalf of Stuart Raeburn
>>[raeburn at msu.edu]
>>Sent: Thursday, September 11, 2014 9:50 PM
>>To: lon-capa-users at mail.lon-capa.org
>>Subject: Re: [LON-CAPA-users] another instance of correct answer
>>apparently      being unaccepted...
>>I have added you to bug 6740, which was filed for a similar situation
>>in a different domain. Note: that bug is only visible to
>>bugs.loncapa.org users explicitly included as a CC, reporter or a
>>developer since it includes some student information.
>>You may want to copy the screenshots you uploaded to
>>https://uofi.box.com/ and linked to in your two posts to the
>>lon-capa-users mailing lists to that bug report as attachments.
>>Stuart Raeburn
>>LON-CAPA Academic Consortium
>>Quoting "Mills, Douglas G" <dmills at illinois.edu>:
>>> Hi All,
>>> I've amassed as much data as I know how to amass on this situation
>>> which has occurred now with a different student. Here's what I have:
>>> Looking at his "scores per problem" view via the Course Progress
>>> interface, it appears that he has credit for all 15 questions:
>>> https://uofi.box.com/s/cn7vrpqyenp1zr7owke9
>>> Clicking on the links to view his actual submissions, however,
>>> indicates that question 15 is currently wrong. Here's a screenshot
>>> of that with the previous tries dialogue up where you can see that
>>> his second attempt was graded as CORRECT:
>>> https://uofi.box.com/s/a17kkg1mfk2029k9kgpz
>>> Here I scroll down the page and look at his submissions for this
>>> part. I see an incorrect submission, what appears to be a
>>> non-submission -- the date and time are there but no other details,
>>> the submission judged as "exact_ans" and then one evaluated ad
>>> "incorrect."  Note also that these two latter submissions are both
>>> listed as Trial: 2. Then there are several more "non-submissions" --
>>>  dates are there, but no other information.   Not in the screen shot
>>>  there are a couple other parts submitted next, then several more of
>>>  these non-submissions:
>>> https://uofi.box.com/s/hdttef80s3d8sn1ueqfr
>>> And finally here is where I click as if to manually assign grades to
>>>  this student.  Part 41 is the part in question. You see here that
>>> it  shows part 41 as currently being awarded 1 point (if I
>>> understand  that correctly) but NOT having the red checkmark next to
>>> it under  weight.  Thinking perhaps I can override, I went ahead and
>>> saved  this as if I had awarded 1 point but that did not change
>>> anything  when I came back to the student.
>>> https://uofi.box.com/s/0ogcwvdze360djbk89np
>>> This is especially irksome because it has occurred on our prelab0
>>> and Safety quiz which is has to be completed before anything else in
>>>  the course can be accessed. The student is stuck, I think as
>>> represented by all the "non-submissions" now showing . I 'll next
>>> try resetting the problem and hopefully he can then successfully
>>> complete it, but I wanted to document what we're seeing here first.
>>> Any thoughts?  Is there somewhere I should be pulling a more
>>> thorough report of what has transpired from?
>>> Doug
>>> Douglas Mills
>>> Director of Instructional Technologies
>>> Department of Chemistry
>>> University of Illinois
>>> dmills at illinois.edu<mailto:dmills at illinois.edu>
>>> (217) 244-5739
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