Teachers burnout because they are asked to do the impossible, say primary and intermediate teachers striking in Canterbury today.

Primary and intermediate teachers may strike again if their demands for more pay and better working conditions aren't met.

The strike is happening because the negotiation of the collective agreements for primary and intermediate teachers and principals has stalled.

Primary and intermediate teachers marching in Christchurch echoed the message of their colleagues further north - they also want pay increases and improved working conditions.

Last week they joined their primary school colleagues in a mega strike - the third time primary and intermediate teachers have walked off the job.

Nearly 30,000 primary and intermediate teachers have been out on the streets today striking for a better deal from The Ministry of Education.