My sister once got a zero because of a 100% match in the system with her own same work uploaded there a few minutes before. It was resolved, but - not very nice emotions.

Same, and discussed with my lecturers.

Especially 1st year business - we use the same text book as the last 10 years (just different versions), where nothing has really changed in the last 30 odd years, using the same template that runs through 600 odd students a year, where nearly every student uses the same easy three references that we used in class.

Its new to you, but no one is going to have an original idea or anything revolutionary in that assessment.

Anyone marking an assignment with a TurnItIn report, who is also in possession of half a brain, knows to read through the report and check where the matches are coming from. A high similarity score can come about for many reasons, and in my experience most of those reasons are not due to cheating.

I've also been the one on the opposite side of the classroom. I was lab based, so we didn't use Turn it in.

With a reasonably sized class, you can easily spot which students have worked together because their reports tend to be shockingly similar.

I agree that you get a feel for them with informal conversations and you can see how their submissions tie up with your informal conversations.

I used to tweak the questions year on year. I've suspected there is a black market, an assignment exchange, or something because I caught students submitting work from previous years. They were mainly international students that were only there for their masters year.