In order to identify your real needs and concerns, ask yourself: "Why do I want what I want?". You will then quickly realize that you have good reasons for wanting what you want.
A practical example.
What I want (position):
- The behavior of my boss is unacceptable. I'm not going to put up with it anymore!
Reasons why (your underlying interests):
- „I don't feel respected anymore. I need to recover my self-esteem.“
- „I now loathe the office. For me, it is essential to enjoy my work.“
- „The climate in the team has deteriorated. It is essential for us and for the company that our team becomes efficient and enthusiastic again.“
Do not take a position. Write down your underlying concerns, needs and interests, and explain them during the meeting.