Students plagiarising assignments: What level is worth the effort of pursuing? As a tutor marking assignments, I regularly come across cases of plagiarism. As someone who put a lot of effort into my coursework studies it really offends me to see what students think they can (and ultimately do) get away with - it's making me incredibly jaded about the way universities are run and the value of (my) degrees.

I spot things from the mild "sharing answers" to the "change a few things so it's not obvious" copying, to the virtually identical outright blatant copying (not even changing the student number) to the absurd "submitting a screenshot of last years solutions". Talking to other tutors I seem to spot and pursue a lot more than anyone else.

When I come across these I always examine them, make a determination if it breaches my threshold (usually a bit past the "just change it a bit" level), then pass it on to the lecturer for them to decide what to do. It takes be significant effort to do this - I might recognise an unusual way of writing something, then go back through the assignments I've already marked to check how similar it is, then I'll decide if it looks too similar, then send an email about it.

I can't remember a single case that has gone further than a warning (yes even the one who submitted last year's solutions). I care about this a lot and I don't want students to think they can keep doing this with impunity, but there seems to be a general reluctance in academia to do anything, even in extreme cases. It makes me wonder whether it's worth the checking, the discussing, the extra time that I don't get paid for and ultimately the emotional toll it takes on me. It would be so much easier to let it slide.

From a pragmatic perspective of (for want of a better phrase) cost/benefit, what level of plagiarism should I be bothering myself with? Should I just ignore anything but the most absurd cases?
I'd like to base my answer on the following piece of the question:


  […] but there seems to be a general reluctance in academia to do anything [about plagiarism], even in extreme cases.


This does not seem to be true. In cases of plagiarism in journal publications, theses or otherwise published material  academia is quite strict and careers have ended because of plagiarism (not only academic careers - at least two ministers in Germany had to resign from office due to plagiarism in the PhD theses which have been written years, even decades, in the past).

Things are indeed different when it comes to homework assignments and there are various reasons. Homework assignments do often repeat and the same assignments may have been assigned in the same form a lot of times in different places. So it is actually likely that different people come up the similar or almost similar solutions. Also, it is hard to prove that people deliberately copied something. Moreover, students may (or should?) be encouraged to work on the assignments in teams and hence, they may produce similar output.

But the dealbreaker for me is: At the place where I am students may cheat on homework assignments, but they will never be able to graduate with plagiarism and copying only. There are more safeguards: oral and written exams, one-on-one meetings with a thesis advisor to discuss the progress of the thesis, theses presentations… As a consequence: I am pretty sure that my students do copy homework regularly. I tell them that they miss a chance to learn something if they write down other people's work and that this will backfire in the written and oral exams later (and it does…). But I never investigate any case of plagiarism in homework (however, I do investigate cases of plagiarism in theses).