Sheffield schools face disruption with members of the National Union of Teachers planning a one-day national strike.
However,fewer classes will be affected than in similar regional stoppages last autumn - as rival union NASUWT has decided against taking part in next Wednesday’s action.
The NUT is continuing its long-running campaign against performance related pay, a later retirement age and increased pension contributions.
The union is also angry about higher workloads and the number of young teachers quitting the profession.
Primary schools could be worst affected as the NUT is strongly represented there.
Roy Bowser, a South Yorkshire official, said: “Teacher workload is unsustainable, as a recent Government survey demonstrates – we demand a step-change.
“The thought of doing the job until the age of 68 is preposterous and driving many away from the profession.
“Teacher morale is at dangerously low levels.
“Children need teachers who are fresh and well motivated not tired and demoralised.
“We apologise for the inconvenience to parents but hope they will support us.”
Paul Desgranges, South Yorkshire NASUWT executive member, said the two unions were still in partnership over the main issues.
The NASUWT had decided to hold back on further action until after Easter as Education Secretary Michael Gove had agreed to new talks and had backed down on some issues, such as changes to holidays.
Mr Desgranges said: “Nevertheless we are hoping the NUT get a good turn out.
“It is important they do otherwise it will send a significant message to Mr Gove.”