Twenty-seven thousand secondary school teachers will start to withdraw some services in schools early next month in industrial action over changes to the Junior Cert.
Some 88% of members from the ASTI and the TUI voted for the action in reaction to plans by the Education Minister Ruairi Quinn to replace the Junior Cert with a new programme.
President of the TUI Gerard Craughwell said the union would direct its members to withdraw from all cooperation with professional development from April 7, and that those schools piloting the new Junior Cert, would be told to stop doing so.
Teachers will also be told to withdraw from all school-based meetings that relate to the Junior Cert.