Crowd Control

Class sizes... how do you define when a class is too big? Would you go by how much noise they make as a group (although some people mistake energetic conversation as irrelevant mass dribble)? Or by how emotionally frayed the teacher is when they return to their staffroom?
20 kids to a class sounds small but are they 20 well behaved kids, or are they 20 disruptive kids? And the same could be said for a larger group of students. It all depends on the mentality of the cohort.

Most people say that while being in the senior years in high school they noticed a change in the behaviour of student because the "trouble makers" have left. I know I noticed the shift in behaviour.
BUT.. with new education laws,  kids that don't want to be at school have to stay until they're 17 unless they find a job or an apprenticeship. So, all they kids that want to stay in high school are stuck with the misbehaving ones for the "important" years in school. Sorry Government, but that was like saying "should I shoot myself in the hand or the foot?". Don't whinge about having to fix something that you, rather embarrassingly, broke in the first place.

I'm not sure limiting the class size would be particularly effective in some instances. Teachers should be trained in crowd control rather than education, especially in the junior years in high school where most of the hyperactive twelvies crammed into an already packed room are more interested in making the teacher cry and discussing the important issue of who is dating who this week than why they always have to find x in maths ("seriously, you've lost x again?!").