Teachers are to hold three more days of strike action over a controversial new appraisal policy.
Earlier this year the Government introduced regulations enabling schools to carry out longer classroom observations.
Last week seven members of teaching union the NASUWT walked out of Dunston Primary School for two days in protest at the “intrusive and unnecessary” monitoring of teachers.
Now Dave Wilkinson, from the NASUWT’s Derbyshire branch, said teachers will hold further strikes on December 11, 12 and 13.
Mr Wilkinson said the appraisal policy was “intrusive, unnecessary and detracts teachers from teaching and raising standards”.
He added: “NASUWT members are deeply committed professionals and regret the strike action.
“They will be lifted if the governors withdraw their monitoring policy and open discussions to seek to agree a policy with the NASUWT.”
Paul Burgess, headteacher of Dunston Primary School, said he supported the Government’s new guidelines and added they were in the interests of pupils and teachers.
Chesterfield MP Toby Perkins said: “It’s very disappointing that parents have been inconvenienced and children’s education disrupted by this strike action which I think should have been avoided.
“What is needed is for everyone connected with Dunston School to work together not further division.”