Teachers in schools across the country are set to begin a series of strikes this summer.
The two biggest teaching unions said they were stepping up action in a row over pay, pensions and workload.
The action is set to start in the North West at the end of June with the possibility of a national strike before Christmas.
Members of the National Union of Teachers and the NASUWT have already taken industrial action short of a strike but that is set to escalate.
NUT general secretary Christine Blower said that the strikes would begin on June 27.
NASUWT general secretary Chris Keates said: "We have three very reasonable demands that we are making to the Secretary of State that can stop disruption to schools from June onwards.
"The time has come for the Secretary of State to listen to the concerns of teachers and school leaders."
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