You can teach which can't see. What's very hard to get
is high-quality formative assessment data. We have lots of summative data -
test scores final grades - that summative data lays around all the time
but it's not usable to drive learning. So
what's surprisingly rare and extraordinarily powerful is
high-quality formative assessment data.
So when we talk about evidence-based teaching we talk about
using the evidence we have in front of us about what's going on in our
classrooms and what's going on with our students
using that evidence, acting on that evidence to change
how what we're doing as teachers and what students are doing as writers.