I have been teaching for 14 years and for 10 of these I have been an AST. I am being observed by the Head Teacher and Head of Key Satge Three later this week with a lower ability year nine group. These observations form part of the school's regular observation cycle and count for our Performance Management. My dilemma is that the class has said that the Key Stage Three leader can not control their behaviour, so instead of the timetabled subject they are meant to be taught, they do a different subject. Their formtutor (who's also my Head of Faculty) has confirmed that the pupils have got it right. As this person is going to judge my teaching I am worried that I am going to find it increasingly hard to listen to them knowing that they themselves can not teach the class. Any advice please?