UFT boss Randi Weingarten, seeking to show that kids can do fine under the union model, insisted on her own charter — “the perfect environment for the UFT to demonstrate that its educational priorities work,” she said. It would produce “quantifiable achievement” to dispel the “simplistic notion that the union contract” hinders learning, she vowed.

Hinders learning, for sure.

Now it seems quite likely the school’s charter won’t be renewed.

That’s the neat thing about charter schools — failure isn’t institutionalized.

Not so traditional schools.

But the UFT’s glaring failure has taught one valuable lesson: The union model may serve labor bosses well; kids, not so much.