I'm quite an experienced HoD but am out of ideas and need some help. In my department I have one colleague who is really struggling with behaviour management. The children at our school are a bit rambunctious but there's no swearing, aggression, violence or anything that would define it as 'challenging' - they're just normal teenagers who can be a pain but who are extremely unlikely to square up to a teacher and shout at them. My colleague has always had behaviour management issues (and has identified this consistently as an area for development - they are fully aware of it) and I've been trying to coach them as well as show students that misbehaviour for any member of staff is inappropriate: observations of the same classes with different teachers, removing students from lessons, department detentions, speaking to the students with the teacher present, courses, mentoring sessions, step-by-step guidance, emotional support - all the usual things etc. I'm now out of ideas and the situation is getting worse. The students now know that my colleague is easy to wind up and the behaviour is getting worse; my colleague is obviously emotional and upset, and their teaching is suffering a lot as a result. My priority is to both support my colleague to get better at this, and provide emotional support too, while making sure the students get the best deal in terms of learning. I've done all the usual things to support but now need something far more robust - it's getting to the point where my colleague expects bad behaviour and is very nervous in front of the students (which then makes them over-react to the slightest thing) and the students are starting to complain. I have a great deal of respect for my colleague but there is no doubt that their teaching is far below a decent standard and that they are finding it very hard at the moment. I fully intend to continue mentoring and coaching sessions but I'm obviously doing something wrong (or else we're past the point of no return)... Ideas? Suggestions? All gratefully received.