So you are supposed to provide data sources about problems, but are not allowed to involve opinions in that? Can you give some examples of feedback that would fit that criteria?
You can opinions if you can express them in a more neutral and actionable way.
- My boss doesn't like me and excludes me.
vs
- I think my boss has a few favorites who get all the cool projects. Despite me being the best person as I had the most experience with technology X, my performance in good standing, and having showed interest in the project, I didn't get assigned to that project.
