Scenario (yes, a cheating one):
Student A has to take a quiz. S/he logs in and starts to answer the Quiz.
Student A sends her/his username and password to a friend, Student B.
Student B logs in and works on the quiz at the same time of Student A.
So we have one quiz that at the same time is answered by several students (e.g. each one working on a section of the quiz) and the mark will be assigned to student A.
How can we prevent this problem?
p.s. I read several other posts but I could not find a solutions for this. I know there are a lot of other ways to cheat, but first we need to start somewhere and second this potentially seems to be a very easy one to organize for opportunistic people.