This is specious. Can you show me direct evidence that these policies have been adopted nationwide to the broad degree necessary to explain the data as presented in the original post?
Can you show me direct evidence that these policies have been adopted nationwide to the broad degree necessary to explain the data as presented in the original post?
No, not 'to the broad degree necessary to explain the data'. But no one in this thread is claiming that these policies alone explain the data.
You say it's a local thing only. I explain how local things expand. You say it's a hypothetical. I say no these things have expanded already. You say that doesn't fully explain the data.
If you will dismiss any hypothesis that doesn't fully explain the data, you will never receive a satisfying answer.
It has had a nationwide impact already. It's not a hypothetical.
Jo Boaler and her organization have done consulting not only in SF and not only in California.
Her impact on K-12 math education is directionally the same as Lucy Calkin's impact on reading instruction.