Almost 350-thousand secondary students will be forced to stay at home today as their teachers go out on strike.
The one day work stoppage is part of a row over Junior Cert reform and will see schools shut around the country for the second time since December.
Unions are unhappy at plans to make them assess 40 per cent of the work of their own students.
Talks between the ASTI, TUI and the Education Minister last week failed to produce an agreement on the issue.
800 Donegal post-primary teachers are taking part in the strike today - amongst them TUI representative Claudia Kennedy - she says they have been left with no option but to strike: