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The National Party wants an inquiry into the role of the Correspondence School, as the organisation faces its fourth restructuring in 10 years.
National education spokeswoman Katherine Rich said an announcement was expected soon of another round of redundancies "with at least 20 positions expected to go".
Mrs Rich said she wanted a moratorium on any further restructuring or staff losses until Parliament's education and science select committee had an opportunity to assess the school's future.
Officials and the minister had offered only "vague" reasons why the restructuring was necessary, she said.
"No evidence has been presented to show that new proposals to regionalise the school's structure will make one iota of difference to students," Mrs Rich said.
"In fact, there are strong arguments that such changes could be to the detriment of students, the quality of education delivered, staff retention and students' access to some subjects."
Education Minister Steve Maharey had told her in answers to written parliamentary questions that he had no ministerial responsibility for redundancies at the Correspondence School.
"As with all schools, these internal personnel matters are the responsibility of the school's board of trustees," he had written.
- NZPA