It's unclear to me what the problem is that this teacher encountered. The students were given an exercise to learn something. They wanted to validate whether th

It's unclear to me what the problem is that this teacher encountered. The students were given an exercise to learn something. They wanted to validate whether they learned something, by validating their solution. This could be achieved by reaching agreement with other students or by asking the teacher. So the problem is that only that ne was unclear that they were supposed to reach agreement instead of asking nir?