The National Association of Schoolmasters Union of Women Teachers today issued its second strike warning in as many days.
Today's threat was over government plans to give headteachers the power to vary staff pay.
Alan Homes, a member of the NASUWT executive, warned that plans to vary the pay according to headteachers' whims in successful schools could "create anarchy".
Mr Homes called the scheme "nonsense", saying: "It will set school against school," and would do nothing to alleviate teacher recruitment problems.
Successful schools would be able to lure the best teachers away from struggling schools, he warned.
Delegates at the union's annual conference in Scarborough sanctioned strike action on a school-by-school, rather than industrial, basis.
The NASUWT, which is normally more moderate than the National Union of Teachers, brought the tally of threatened teacher action up to eight since the beginning of this year's teaching conference season.
The eight threats of work-to-rule, industrial or strike action
· The NUT has called for an increase of 10% or £2,000 - whichever is greater - in the basic teaching salary and an increase of the inner London allowance to at least £6,000 with a proportionate increase in the outer London and fringe area allowances. Plans for rolling industrial action up to, and including, strike action were sanctioned
· Regarding the privatisation of education, NUT delegates made it clear that where teacher's jobs, pay or conditions might be affected, strike action would be organised
· The NUT called for a teacher's condition of work to be improved with the maximum amount of time spent in class with pupils set at 22.5 hours a week, with time guaranteed for marking and preparation, and the guarantee of a 35-hour week. Industrial action could follow
· Teachers represented by the NUT want a guarantee against plans to make teachers undertake professional training in their own time. They want training to be part of the working week and would take action, including strikes over the issue
· Teachers would consider boycotting SATs after canvassing members' opinions
· The ATL and NASUWT, with the NUT, issued one common motion. They are threatening to "work-to-rule" on a 35-hour a week basis if the outcome of this year's comprehensive spending review provides insufficient funds to meet the recommendations of the review body on teachers' workload, due to report at the end of the month
· NASUWT members voted to take action over performance-related pay, which they say is under-funded and therefore inherently unfair
· The NASUWT issued their second strike threat over the rights of headteachers to vary pay between staff.
