I've done 3 days this week in a fairly difficult class. I've been there before, but only a day at a time. The TA seems to constantly undermine me. She looks after an ADHD (I think) child who is thoroughly disruptive and seems to give him far too much leeway. She makes comments about the work I set, always seems not to know the school routines or gives me insufficient information about them. She manages to disrupt those around the table, quite often when I've just got them settled, by making silly comments as though she thinks I'm being really too hard on them and she 'understands' them. She was off on Tuesday and boy did I notice the difference. Another TA was so helpful and really gave me the assistance with the class I needed. I've tried being quite firm in what I want them to do and not really paying too much attention to the comments. I don't feel able to do much about her as I'm not about to start a power struggle with someone who could make trouble and after all I might not get called in there again. Sorry! Rant over, I just needed to get it off my chest.