Reformers also point to studies showing that teachers’ value-added scores are the best predictor (albeit a weak and error-prone one) of a teacher’s future value-added scores – a self-fulfilling prophecy.
These arguments are incredibly flimsy.
In response, I often explain that if we lived in a society where people walked everywhere, and a new automotive invention came along, but had the tendency to burst into a ball of flames on every third start, I think I’d walk.
Now is a time to walk!
Some innovations just aren’t ready for broad public adoption — and some may never be. Some, like this one, may not be a very good idea to begin with.I won't quote any more because you really have to go read the entire thing. Bruce has the ability (like Paul Krugman) to take complex statistical ideas and explain them in a way a layperson can understand.
So print out his op-ed, and put copies on the staff room tables at your school. This is important.