Non Violent Communication is a communication process with 4 key elements
1. Observations: What can we sense? Without judgement, we start by describing what we see, hear, or understand to have happened. Just the facts.
2. Feelings: Identify our emotional response. Given what happened, how do we feel?
3. Needs: What are the underlying needs we want addressed?
4. Requests: What would we like to happen next to address those needs?
Marshall B Rosenberg wrote a book that spawned an industry of devotees committed to the idea, and the practice.
More info
Non Violent Communication: A language of life by Marshall Rosenberg
Free intro course at NVC training