Last year I posted an article on The Unfairness of Measuring Teaching Performance concerning anonymous student comments that said that the teacher was “too old” . An article published on the online site Phys.org  found that male teachers were most likely to be evaluated the highest by students and female teachers from a non-English background the lowest. Further, the bias showed up most in student surveys in Science and Business and was largely absent from students surveys from Engineering and other disciplines.
This study was based upon 500,000 student surveys of teaching at the University of NSW, Sydney between 2010 and 2016. It involved more than 3000 teachers over 2000 courses. across 5 Faculties.
In my previous article, I strongly supported teaching surveys as a tool for professional teacher development using tailored questions that are teacher selectable. It was my belief that problems arise because of
… the impersonal nature of the survey, as well as the fact that it is exclusively university, administered, that is the heart of the problem.