Actions have purpose.
Similarly we do not act randomly; everything we do is trying to achieve something, although we may not be aware of what that is.
People are not broken.
If a person's strategies are not working it is the strategy, not the person, that needs changing.
The map is not the territory.
Each of us has a sort of map of reality created through our experiences, memories and beliefs. Our behaviours are responses to the map rather than to reality. With NLP we can change the map in order to create more choice.
There is no failure only feedback.
I think this is probably the most contentious of the presuppositions. As I continue to research and learn about NLP I am developing an understanding of it and currently read it as saying that if we label something as 'failed' we are imposing a Kind of premature closure. If we give ourselves the opportunity to learn from a mistake and try something different we may well succeed.
Modelling offers the possibility of excellence.
This is probably the most fundamental of the presuppositions since NLP, is in essence, all about modelling. If one person can do something exquisitely it is possible for someone else to learn to do so.
You cannot not communicate.
Even sitting totally still and quiet will communicate something. Your posture, the clothes you wear, the expression on your face, your breathing and much more will all be communicating.
Be at cause rather than at effect.
Once we understand that we are in charge of our own minds we can recognise whether we are behaving as if we have a choice or not. At cause you will feel in charge of your own actions whereas remaining at effect is to adopt the position of victim. Which would you prefer?
More presuppositions
Each school of NLP, if not every NLP practitioner will have their own list of presuppositions and interpretations. It can be an interesting undertaking to compare and contrast them.