Nonviolent Communication by Marshal Rosenberg

avoid confusing observations from judgements

if a person suspects punishment for not filling a request, the request is interpreted as a demand

being in a relationship does not invalidate the need to fulfill your own needs

when people's needs and lack of fulfillment is finally charted, it is often simple to figure out a solution to a community's problems

a relationship should optimally be the mutual fulfillment of needs without the feeling of continuous demands