Effective consequences are certain, swift, and proportionate — in that order of importance. A small, certain consequence applied consistently will change behaviour faster than a large, occasional one. Pupils don't fear the size of the punishment; they respond to its inevitability.
Sanctions should target behaviour, not the person, and they should never humiliate. A 10-minute detention to complete missed work teaches accountability; standing a pupil at the front to be mocked teaches resentment. The first is professional; the second is misconduct.
