Not that I disagree with the statement. Just seems to be getting ahead of ourselves. Especially when it's followed by statements about how we don't know how to measure teacher effectiveness.
Hmm. Curriculum? Give a student a textbook, they may learn despite the teacher.
I'm still amazed by my student who aced the pre-test on logs. I knew she hadn't done anything with them for the year and a half before the test, so asked her when she learned them. From my predecessor. Who taught by telling students to copy the answers he put on the board.
How do we define "achievement?"
Test scores, of course. What else? *Sigh* If only it weren't seen as that easy.