TUI members of the Mayo, Sligo and Leitrim Education Training Board (MSLETB) are set to go on strike this coming September.
It's in a dispute over breaches of the teacher transfer agreement.
95% of TUI members voted in favour of undertaking industrial action when schools return in September if the issue is not resolved by then.
The union say that MSLETB have continually broken the national agreement, which states that teachers cannot be transferred to schools over 45km from their homes.
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TUI President, David Waters, says that union members will not stand for it.
