“Love it, leave it or change it!” This well-known saying is metatheoretically very wise. Negotiation competence refers to the strategy “Change it”. To negotiate with the other person about fulfilling one’s own needs and concerns, to fathom out if compromise is possible, to allow the other time to change his mind, all this is a part of a functional interaction with one’s own needs. And it is a daily routine. The struggle for flexibility, about who and why, how, when and where someone can postpone his needs in favour of another, is necessary in the social context. Social systems are dependent upon this ability of psychological systems if they do not want to fall into permanent conflicts.