In my childhood time, CPs were an efficient method to bring a student on the right track and a serious deterrent for the other pupils of the class. I doubt the 'new' methods (detention, lines, etc.) work the same. The students are less educated, disrespectful and even agressive towards their teachers. For misbehaviour or not learning my lessons, I got the wooden ruler, the switch in front of the whole class, even I was a top student. A bad raport could bring me another spanking at home. And they all were useful to me.
