"Our claim asserts that the government has failed to recognise and provide for Māori taonga, namely vocational education; and failed to honour the principle of partnership under the Treaty," said Ratima, who was last year awarded the ONZM for his services to Māori over many decades.
He said 22,500 Māori take part in industry training and reap the benefits of the ITO system, and should be protected.
Skills Active has achieved parity between Māori and non-Māori completions, which Ratima said was something no other university or polytech had achieved.
"So, where is the evidence for dismantling the ITO system when it's not broken, and it's working for Māori?," he said.
"The Minister should be in no doubt that we believe these reforms will negatively affect Māori learners," he said. "Government needs to embrace the concept of co-design from the outset, and by collaboration, produce mutually beneficial outcomes."