Schools in Fife could close after staff voted for more strike action.
Members of Unison walked out last month whilst they considered Cosla's latest pay offer, which they rejected this afternoon.
The dates the action's going to take place on are too be confirmed in the coming days.
UNISON’s Scottish secretary Lilian Macer said: “No one takes industrial action lightly. It’s a very difficult decision for anyone, but as much as this is about pay, it’s also about standing up for local services.
“The school staff taking part in strike action support children in school every day of the year, and many are parents with school-age children too.
"Workers are taking action because they want children to be educated in well-resourced, well-staffed schools. They want to start trying to reverse years of cuts and under-investment in the workforce and services.
“No one wants to cause disruption for pupils and parents, but school staff have been left with no other option. The blame must be laid squarely at the door of Cosla and Scottish ministers. They have it within their gift to end the strike, but they are showing no sign of wanting to do so. That’s a terrible shame for everyone affected.”
Chair of UNISON Scotland’s local government committee Mark Ferguson said: “UNISON’s local government members have voted overwhelmingly to reject this offer, which shows their resolve to fight for the fair pay they deserve.
“I’m a parent myself, so I understand the disruption these strikes cause. But if wages don’t rise, school staff will leave for other jobs beyond education that pay significantly more an hour. That would be a disaster and would help no one.
“The current offer amounts to a real-terms pay cut and adds further stress to a dedicated workforce who are already suffering from the cost-of-living crisis.
"Cosla and the Scottish government need to give school staff a decent pay rise, fund any increase properly and commit to implementing a pay of £15 per hour for all local government workers.”
Almost 90% of workers voted against the offer will has led to a rolling programme of action in schools in the coming weeks.
Fife Council's head of HR Sharon McKenzie confirmed that the local authority is aware of Unison's plans for further industrial action.
A spokesperson added: "There are no specifics details on their plans available at this time.
"We will be assessing the potential impact this action could have in Fife and will work to minimise the effect of this locally. As before, at this point we cannot rule out closures of school buildings to pupils during any industrial action."