Teaching unions in Northern Ireland are set to take "unprecedented" joint industrial action over pay.
Members of the INTO, NAHT and NEU have voted to take co-ordinated action short of strike, and members of the UTU are expected to follow.
Teachers in the NASUWT union previously began industrial action short of a strike in May.
Members of the INTO and NAHT have also voted to give their unions a mandate for strike action.
The votes came after teaching unions in Northern Ireland rejected a pay offer from employers as "inadequate" earlier this year.
