The Public Expenditure Minister has appealed to the ASTI to reconsider its plans for industrial action.
The secondary teachers union is the only union to reject the Haddington Road Agreement - and it last night announced that its members will withdraw from meetings outside school hours, school planning and in-service training.
The action will begin on October 2nd and run for two weeks.
But Minister Brendan Howlin says Haddington Road can't be changed - and is calling on the teachers to reconsider their plans.
However the ASTI has defended its decision to undertake the industrial action.
Deputy General Secretary Diarmuid DePaor, says it will not cause much upset to students as the duties being abandoned do not affect school or extra curricular activities:
