When the results came back, it was a big mess. First of all, there were students submitting Excel spreadsheets with author names of their classmates. Or author names of past PhD students, who prepared solution keys in 2006. (And which have the incorrect solution as well.) It was also obvious to detect students who used layouts used in past solutions as some of them did not even remove the border formatting for the Excel cells. (Yes, if you double underline cells E5 to E9, and use a Garamond font just for that part of the assignment, there is a strong suspicion that you copied and pasted the solution from 2008, which had exactly these characteristics.)
If you're asking students to dig holes and fill them up again, it can't really be much of a surprise when they point you to a patch of raked dirt and say, here you are, done.
The TurnItIn software looks incredibly useful.
The only way i realized is when i looked at the Turnitin receipt and saw it was not mine.
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