I gave my students a take home exam over spring break. (This is normal where I teach) One of the questions was particulary difficult. It came down to a factor of three in the solution. That factor inexplicably appeared with no justification on many of their exams. I intend to have the students I suspect of cheating come to my office to solve the problem on the board. What would you do?
Edit: I gave them the Tuesday before spring break until the Thursday after. I didn’t want it to be right before or right after.
When I say normal I mean giving take home exams.
I mean, even if the teacher specifically said “this isn’t an open book test and only use the knowledge in your head” when handing it out, this teacher is still entirely out of touch with reality and needs to a) never do that again and b) not punish the students. If it’s in person and the teacher says it’s not open book (or even if the teacher doesn’t say it’s open book) and someone is getting answers from the internet on their smartphone or from the book or their notes or whatever, that is 100% a cheating situation and should be handled as such. But honestly I’m not sure how someone can hold “take home test” and “the students cheated” in the same brain at the same time.