em could easily move from tests to teacher assessment. I don’t think it does: it shows that teacher assessment is correlated with tests, but we knew that already. And it offers only assertions, not data, on the key issue of bias in teacher assessment.
For the record, I think that teachers do have an incredibly important role to play in assessment, and I don’t think that national assessment systems currently make the most of them. At No More Marking, where I work, we have thought very carefully about creating assessments that use the expertise of serving teachers without introducing bias, and we’ve come up with an assessment structure which we think achieves this aim. If we really want to increase the role of teachers in assessment, we need to acknowledge the existence of bias and look at ways to work around it, not ignore it or assume that a high correlation means bias cannot exist.
Rich Davies helped with comments & graphs – thanks Rich!
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