Teachers are urging the government to pump more money into Novopay so they can receive their pay rises sooner.
They are taking legal action because they won't get the extra money until September.
Post Primary Teachers' Association vice president Melanie Webber told Kate Hawkesby Novopay has been an issue for quite some time.
She says it's hugely under-funded and needs to be addressed.
A nationwide strike by primary, secondary and area school teachers over the pay deal that was on offer took place on 29 May, but teachers at primary and intermediate schools subsequently accepted a deal giving them an 18.5 percent pay rise over three years.
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