3 times a day? Record them. Then, after a couple of weeks,send the record to the HT cc to the union rep and to the local union secretary. Dear Ms I have recorded the following visits to my class ... I fully accept your right as HT to monitor teaching and learning within the school. However, on the undernoted occasions (dates) you made the following comments to my class regarding my teaching (verbatim). I believe that these comments go beyond what is reasonable in the circumstances and I would call your attention to our employer's policy on fair treatment at work (or whatever your local authority calls its policy but it will have one - enclose a copy downloaded from your LA intranet perhaps) Please note the following sections...(the policy will almost certainly refer to the following from my employer's code of practice) 6.4.2 Bullying may be characterised as: ‘offensive, intimidating, malicious or insulting behaviour, an abuse or misuse of power through means intended to undermine, humiliate or denigrate or injure the recipient’. 6.4.3 Examples of bullying behaviour in the workplace include: shouting at a colleague; persistent negative attacks on a colleague’s personal or professional performance; criticising a colleague in front of others; spreading malicious rumours/making malicious allegations particularly on the gounds of sex, race, disability, sexual orientation, religion or belief or age; persistently setting objectives with impossible deadlines or unachievable tasks; removing and replacing areas of responsibility with menial or trivial tasks; undervaluing a colleagues contribution; placing unreasonable demands on and/or over monitoring a colleague’s performance; withholding information with the intent of deliberately affecting a colleague’s performance; excluding colleagues by talking solely to third parties to isolate another; conduct that degenerates, ridicules or humiliates an individual, especially in front of their colleagues. I would welcome feedback regarding such visits. So that the teaching and leaning of my class is not compromised, I would suggest that this takes place at a mutually convenient time outwith class contact time. Sincerely etc Make sure your friend has full support from her union before going down this road. She must be careful also not to encourage others to take action as this coul;d be interpreted as trying to bully the HT! It is important that your friend is seen to act reasonably and to accept the HTs right to manage. It is the way this is being done which is the problem, not the HT herself. As with children, tackle the behaviour and not the person.