How can you give good feedback?

We all work for someone or something. That work is probably tangible. That means, it can be observed, evaluated, referenced, used, and improved upon. You submit a thesis draft to your professor, or you submit a report to your employer. You then ask for feedback because good work gets you ahead. More often than not, that feedback is a question mark. It is just hard to understand what the feedback means. It is probably vague, contains a remark, and delayed. Have you always found such feedback useful? Feedback should be F.A.S.T. Quality Feedback has structured components. Sometimes you get feedback which has no tangible value. Let us say you drafted a plan for a promotional event. Imagine that your employer replies to you after 1 week with the following: "Thanks, I checked your work. Improve it a bit.". And then your thoughts start flooding your brain. Improve what? What did you check? I spent 50 hours on it. I checked everything. Is something wrong? Did I miss something? What...