[gnicholas]

> Parents can also easily move kids to other classes to avoid unwelcome company.

This is definitely not the case in the schools our kids go to. The class sizes/composition are shaped by the demands of the teacher's union, we recently learned.

We always thought that the parent survey the school sent out, asking about your child, was so that our kid could be put in a class with a teacher who would be compatible. Not so, we learned!

The information was used to create class cohorts that are evenly balanced, and only after this happens are cohorts assigned to teachers. But at this point in the process, the desires of 20 distinct families cannot be used to match students with teachers.

Instead of focusing on matching certain types of students (those who need more remedial work, those who need more advanced work, etc.) with teachers who are good at providing that type of learning, the school is focused on making sure that all of the teachers have the same class composition, so that none of them can claim to have a "worse" class than anyone else.