Is It Permitted To Evaluate Your Teacher Honestly?

DF posts: "Very often "halacha" is just common sense. [Except in matters of ritual, where it is frequently the opposite.] In this case, Dr. Meir quotes the Chafetz Chayim to say you can use surveys if it’s constructive, and that one should be careful not to allow the survey system to be abused. For this you need Halacha? And decent business manager can tell you the same thing."