One thing that isn't talked about much surrounding feedback is the power structures around it. While anonomous submissions of written feedback provide some protections, ussually a supervisor or subordinate is providing feedback to the other. While top down doesn't provide much danger, bottom up can inarguably open vulnerabilities of a worker. At least, this is something my mentors have said about providing feedback. Fortunately, students are young enough to be exempt from these social worries.

If and when feedback can be earnestly provided, the Eight Ways Students May Respond to Feedback, having prompts to simplify the open ended nature of "what can be improved" can help students make sense of providing feedback.