ASTI leaders are under pressure to suspend industrial action immediately, and cut the losses being suffered by their members.
Young teachers who may lose the chance to get a permanent contract if the row is not sorted quickly are the focus of a move to bring forward a decision to call off the action.
The secondary teachers' union has bowed to pressure from members to hold a convention on June 10 to consider a suspension of action. But there is a growing concern that even a 'yes' vote that day will be too late to salvage any benefits of the Lansdowne Road Agreement (LRA) in the current school year.
Department of Education officials confirmed that the "boat has sailed" on retrospection for LRA pay restoration measures this year. However, they said they would deliver a "constructive" response to a move by the union to suspend action.