Teachers across the UK are being asked if they want to strike over pay.
Some teachers in Scotland have already voted in favour of industrial action.
Most state-school teachers in England, Scotland and Wales have had a 5% pay rise this year. In Northern Ireland many have had a 3.2% rise over the past two years.
But unions argue inflation above 10% means these are pay cuts, in real terms. Thousands of workers in other jobs have gone on strike for the same reason.
Demands vary, but most unions are calling for an above-inflation pay rise. They also want schools to be given extra money to cover the increase.
