The Teachers Council on Wednesday added its voice to opposition to the Government's proposed charter schools.
A parliamentary select committee is continuing to hear submissions on the Education Amendment Bill that will introduce the schools.
Although charter schools will receive public money, they won't have to follow the New Zealand curriculum or be required to employ registered teachers.
Teachers Council chair Alison McAlpine said most, if not all, parents want their children taught by trained and registered teachers.
Mrs McAlpine said a substantial body of international evidence supports the importance of high-quality teachers.
Children's Commissioner Donna Provoost says the Government's proposed charter schools are a harsh experiment to run on children and there are many other ways besides charter schools to boost student achievement.
The Post-Primary Teachers Association said charter school operators seek to line their own pockets and the public deserves to know where public money is going.
The Chief Ombudsman last week said charter schools are unconstitutional, if plans to exempt them from the Official Information Act go ahead.