Four part model
From NVCWiki
The four part model of Nonviolent Communication involves an observation, the feeling that is present in you, the need that has caused the feeling, and a clear request.
In NVC expression all four parts are used. When verbalizing empathy, only the first three or even just the feeling and need are spoken.
There is an out, in, out pattern to the model - the observation is something concrete and specific out in the world, the feeling and need help you go as deep as possible with what's alive in you and/or others, and the request is about manifesting as specifically as possible out in the world again.
(this could obviously use a lot of expanding)
More on needs by Manfred Max-Neef