DD,s school is apparently going to do this at Years 3 and 5. Does your school do it and if so do you think it works ? What are the biggest problems you've found. I think it sounds like quite a good idea but as DD and I know parents and kids across the two classes I think that perhaps she won't suffer much from it. They will take many factors into account so I don't think it will be a random re-shuffle IYSWIM....