An Education Week piece quotes Duncan directly connecting class size to teacher quality, rather than the standard argument that they’re somehow in competition.

He says a class size drop to 15 would make a difference for students experiencing the least success.

He questioned whether reducing class sizes by just a few students, as has been reported anecdotally under Title II, represents a breakthrough in teacher quality. “if you’re going to do something, do it” by reducing classes from, say, 26 to 15 students for low-income students, he said.

‘Nuf said, Arne, let’s do it.