Open Polytechnic lecturers have voted to take industrial action in protest over plans to cut their research and development time in half.
The Open Polytechnic taught 40,000 students last year and has 120 full time lecturers.
The Tertiary Education Union says the polytechnic wanted to cut down the research and development time of those staff from 30 to 15 days a year.
The union says lecturers need those hours to make sure their lessons are up to date and to remain experts in their field.
It says the industrial action could include withholding student marks, working to rule and lightning strikes.