The no-lose problem solving is based on the philosophy, which assumes that in a conflict it is possible for both sides to have their needs met. It usually needs creativity for finding a new solution matching both sides, and/or to apply certain communication methods.
Non-judgemental behaviour is a way of accepting people with whom we disagree. It happens when someone adopts a non-judgmental attitude while not reflecting own biases and this attitude pervades all his/her interactions. Most of the time this means that we look at what was said instead of who said it.