The NZEI is calling for a full public inquiry into what it calls 'the Novopay debacle'.
Security breaches are the latest revelations in a long list of calamities since the Novopay system was introduced three months ago.
The $30 million Novopay system has left hundreds of teachers across New Zealand either short-paid, or not paid at all.
NZEI National Secretary Paul Goulter says there needs to be a full inquiry to find out the cause of the fiasco, who is responsible, and how it can be fixed so the problems never happen again.
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Mr Goulter says Novopay has caused endless stress for schools and staff for months and it needs to be fixed immediately.