http://www.skepdic.com/neurolin.htm
“It seems that NLP develops models which can’t be verified, from which it develops techniques which may have nothing to do with either the models or the sources of the models. NLP makes claims about thinking and perception which do not seem to be supported by neuroscience. This is not to say that the techniques won’t work. They may work and work quite well, but there is no way to know whether the claims behind their origin are valid. Perhaps it doesn’t matter. NLP itself proclaims that it is pragmatic in its approach: what matters is whether it works. However, how do you measure the claim “NLP works”? I don’t know and I don’t think NLPers know, either. Anecdotes and testimonials seem to be the main measuring devices. Unfortunately, such a measurement may reveal only how well the trainers teach their clients to persuade others to enroll in more training sessions.”