We pushed very hard at my alma mater to publicize course/teacher evaluations. We eventually got the University to accept iff a minimum participation rate was met (on a per course basis-- so it wasn't all or nothing. We'd get a subset of the data when enough participation occurred. We considered this reasonable, since if very few students participate, the data isn't all that meaningful). Regarding professors wanting t…
But alternative isn't bias someplace else. The alternative is engaging in biased activity or not doing to.