[Bf-education] how to catch cheaters in a class?

Thu May 25 21:37:34 CEST 2017

I was also thinking about giving out team projects. This would mean, if
there were cheating, it would at least be a team effort.

On Thu, May 25, 2017 at 7:37 PM, Antonio Carvalho <antoniorcn at hotmail.com>
wrote:

> Hi Piotr,
>
>     I'm teacher in Brazil, working in many classes of Java Programming, C
> Programming and cheating is a problem faced all days.
>
>     Actually I'm giving individual works for each student (they can choose
> what they want to do), and according to Ton Roosendaal sugestion, I applied
> a competion, each student evaluate the job of other 3 (or more students),
> based in some criterias, distributing  a number of specific points for each
> criteria, for sample 18 points in case of 3 jobs, and to avoiding have them
> distributing 6 points for each, without evaluate correctly, I penalize the
> students that evaluate the jobs in certain criteria, in diferent way than
> the other peers.
>
>     It looks like complicated, but there are some tools which allow it, in
> my case I'm using Moodle (www.moodle.org) whoose have a kind of exercise
> type named workshop allowing this propose, in this kind of exercise the
> teacher can specify the criterias, the student can submit his own work,
> after that the tool will random who will evaluate whom, and at the end you
> can calculate the average of each student.
>
> Regards,
>
> *Antonio Rodrigues Carvalho Neto*
> Faculdade de Tecnologia do Estado de São Paulo (FATEC)
> campus Zona Leste e Carapicuíba
> Analise e Desenvolvimento de Sistemas e Desenvolvimento de Jogos Digitais
> antonio.rcarvalho at fatec.sp.gov.br
> antoniorcn at hotmail.com
>
> Em 25/05/2017 13:24, Ton Roosendaal escreveu:
>
> Hi,
>
> When a teacher starts putting tricks in place to avoid cheating he's
> losing it. I wouldn't solve the symptom (cheating) but the cause (students
> don't like homework or assignments).
>
> Give them something that relates to them (build your own bedroom) or makes
> it personal (give each a different letter of alphabet to do something
> with). Think of a challenge involving competition. Or teamwork. And they
> should actually learn skills from it. It's the process what counts then,
> not the result.
>
> -Ton-
>
> --------------------------------------------------------
> Ton Roosendaal  -  ton at blender.org   -   www.blender.org
> Chairman Blender Foundation, Director Blender Institute
> Entrepotdok 57A, 1018 AD, Amsterdam, the Netherlands
>
>
>
> On 25 May 2017, at 07:52, Piotr Arłukowicz <piotao at inf.ug.edu.pl> wrote:
>
> Thanks Mike,
> in fact, I already was forced to do such 'heuristics', because lots of
> files were 'too' similar.
>
> However, in case of animation this is rather hard to tell, especially when
> students are opening the same file with assignment. I could potentially
> solve that telling them to import rather than open, and then such lovely
> random string or just something (creation timestamp?) will be a nice
> addition to the normal Blender.
> How many teachers are still here? Don't have any of you cheating problems?
>
> Maybe it's a good idea to create such a plugin, where student can 'submit'
> the work right from Blender...
>
> pio
>
>
> Piotr Arłukowicz, PhD, BFCT
> University of Gdańsk, Faculty of Mathematics, Physics and Informatics,
> Dept. of AI,
> Wit Stwosz 57, 80-952 Gdańsk, room 121, tel.: +48585232151
> <+48%2058%20523%2021%2051>, https://inf.ug.edu.pl/~piotao
> Polish Blender Course: http://polskikursblendera.pl/ [PL]
>
> 2017-05-25 0:12 GMT+02:00 Mike Pan <mike.c.pan at gmail.com>:
>
>> Very interesting question...
>>
>> You can certainly build an addon that saves a random string of some sort
>> into the Blend file. Or even something that tracks the originating computer
>> name and total time spent editing the file (to prevent copy+paste from
>> blendswap/turbosquid) but the students can always 'forget' to use the
>> correct blend version or the addon.
>>
>> I think a more fool-proof approach might be to analyze the students'
>> files based on a bunch of heuristics. This way, the blender file doesn't
>> have to be special, but you can still catch copycats.  Here are some things
>> you can look at:
>> - Datablock names. Especially mesh, material and image names, which is
>> something many people don't bother changing.
>> - Node positions. Even if the material is identical, chances are the
>> nodes are arranged differently. (unless they are using the material panel
>> to generate all the nodes)
>> - Look at exact value of properties? (eg. If both students are using a
>> particle system, unlikely they are both emitting exactly 2740 particles
>> from frame 77-333)
>> - if an image texture has been packed and not "made relative" yet, it
>> might contain the full path of the image, which is telling if it originated
>> from another user/computer.
>>
>> That's all i can think of for now. Hope that helps,
>>
>> Mike
>>
>> On Wed, 24 May 2017 at 12:14 Piotr Arłukowicz <piotao at gmail.com> wrote:
>>
>>> Hi all,
>>> is there any way for a teacher to tell whether or not some files in the
>>> class, which were collected from an assignment, are copied from the same
>>> person or were created on the same computer?
>>>
>>> I have classes and I have collected quite a few blend files to check.
>>> They are similar in few areas, so I'm unsure if they were created by
>>> different persons.
>>>
>>> To solve this problem Julian wrote a small patch few years ago which
>>> stored a random number inside blend file (so I could at least tell if
>>> somebody copied somebody's else work and modified it slightly), but
>>> unfortunately I've got a bunch of files made in just an ordinary, brand
>>> blender release 2.78.
>>> Files from students are suspiciously similar (for example a manipulator
>>> is often set to rotate, not translate).
>>>
>>> So, is there ANY way to tell?
>>> If not, it could be a good idea to introduce just a random number or
>>> microsecond stored when file is created and then never changed. This small
>>> thing could make life easier and could also detects nasty cheating, which,
>>> unfortunately happens too often in some countries :(
>>>
>>> anybody?
>>>
>>> regards
>>> pio
>>>
>>> pz
>>> piotr
>>> --
>>> Piotr Arlukowicz
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-- 
Douglas E Knapp, MSAOM, LAc.
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