Neuro-Linguistic Programming (NLP) studies the structure that how humans think and experience the world around them. NLP has developed techniques for quickly and effectively changing thoughts, behaviors and beliefs of a person. We can understand how some people respond very resourcefully in a situation where others do not. Once it is learnt how those who remain resourceful set up their representations in some circumstances, then it will become a simple matter to teach others to do the same thing in same circumstances.
The popular belief in NLP is that we don't pay much attention to what's going on in our unconscious. The enormous number of thoughts that our brain encounters each day, we do not think about them. The most important thing about NLP is that NLP is about what works and not about that what should work. Based on this philosophy NLPers have developed different types of models to deal with a specific situation according to their requirements. In simple words if what someone is doing is not working, he should try something else; anything else, regardless of what he had been doing should have worked.
For understanding the NLP philosophy think about two persons, one who is spider phobic and the other who is not. They are said to imagine a big spider hanging in front of their face for five seconds. It is obvious that the person who is spider phobic will imagine that spider is too big and too close to his face as compared to the other. Even after five seconds when he will open his eyes he still may be thinking about spiders while the other does not. But if this is said to both of them with their closed eyes that spiders are tiny, well-mannered creatures that are far more frightened of you than you should be of them, they will both show the same reaction almost.
In the same direction, if a person enjoys having fun in playing with his pet spiders then we can learn those things about spiders from him that we could teach the spider-phobic persons so that they can play with spiders too. Because if the spider-lover is put into the same situation and asked to close his eyes and to imagine a spider close to his face it is most likely that the spider lover will imagine an image of spider which is proportionally correct and at a reasonably distance from him.