As we reach the end of the semester, the students in my class are being asked to do their evaluation of my teaching, as is common at most universities. As with most evaluations that I know of, I have been given an opportunity to provide open-ended prompts for the students to respond to.
I would like to craft open-ended questions for the students that will help me to improve my class/teaching style. This class was a large (~100 students) lecture, so I would like to focus the questions on how to improve myself in teaching large classes. Has any research been published showing which questions (or which types of questions) generate answers that are most effective at helping teachers to improve at teaching large lectures? If no research, is there any anecdotal evidence of "most helpful" questions?