Presuppositions in general are beliefs underlying a system. The presuppositions of NLP are beliefs that have guided the development of NLP. They are not necessarily true, but produce useful results.  Beliefs are usually self-fulfilling. If we believe someone doesn’t like us, our defensive manner can make this a reality. If we believe we can master a skill, we persevere until we do. All about NLP presuppositions - Evgeniy Denissov.