Matt Barnum:

When charter school teachers push to unionize, charter leaders often fight back.

That’s happened in Chicago, New Orleans, Los Angeles, Philadelphia, and Washington DC. Unionizing, they argue, would limit the schools’ ability to innovate, ultimately hurting kids.

But a new study of California schools finds that, far from harming student achievement, unionization of charter schools actually boosts test scores.

“In contrast to the predominant public opinion about school unionizations, we find that unionization has a positive … impact on student math performance,” write researchers Jordan Matsudaira of Cornell and Richard Patterson of the U.S. Military Academy.

The analysis is hardly the last word on the question, but it highlights the limited evidence for the idea that not having unionized teachers helps charter schools succeed — even though that is a major aspect of the charter-school movement, as most charters are not unionized.

“Contrary to the anti-worker and anti-union ideologues, the teacher unions in charter schools don’t impede teaching and learning or hurt kids,” said Randi Weingarten, the president of the American Federation of Teachers, which represents teachers in more than 240 charter schools. “And the findings — that schools with teachers who have an independent voice through its unions have a positive effects on student performance — are consistent with common sense and other studies.”

Madison has long spent far more than most government funded school districts (now nearly $20,000 per student), yet we’ve long tolerated disastrous reading results.

Yet, Madison’s non diverse governance model continues unabated, aborting the proposed Madison Preparatory IB Charter school and more recently a quasi Montessori charter proposal.