Secondary School teachers are beginning industrial action against the new Junior Cycle this morning.
Members of the ASTI and TUI unions say they won't take part in any meetings, planning or training for Minister Ruairi Quinn's reforms.
They say their concerns about marking papers from their own students aren't being listened to.
It comes amid speculation that the Leaving Cert could be next in line for changes.
The TUI's General Secretary John MacGabhann says the action will have no impact on classes.
