Up to 50 members of staff at a Coventry academy are to go on strike in a dispute about excessive workloads and pressure on teachers.
Concerns have been raised over a number of issues at West Coventry Academy and more concessions were needed, the National Education Union (NEU) said.
Teaching hours had recently been increased with plans to increase them further in subsequent years.
All union members voted to take strike action on 11 October, the NEU added.
"Since the beginning of the ballot, the school have already further increased teaching hours to the highest for any secondary school in Coventry, and plan to further increase hours in subsequent years," a union spokesperson said.
