Persistent grade biases
Grading is never perfect or completely accurate. But when entire groups of students receive better grades than external test scores would justify, then we have a bias that requires explanation, indeed, a problem of fairness.
In a current research article, Chantal Oggenfuss and Stefan Wolter show that this grading bias persists even after teachers, parents, and students have seen the external test results.
So more would be needed to make teachers aware of the bias in their assessments – and, very importantly, abolishing grades or replacing them with other forms of assessment is unlikely to eliminate the bias, but would rather make it more difficult to detect.
