Prime Minister John Key does not expect secondary school teachers to find much support from parents for their industrial action over pay.
Members of the Post Primary Teachers Association have voted to take one day of industrial action this term and plan further stoppages next term.
They are seeking a pay increase of 4% and have been offered a rise of 1.5% this year and another 1% next year.
Mr Key says the offer is fair, given the difficult economic conditions.
