I enrolled in KORNERSTONE’s NLP certification training via recommendation from a respected friend, who is a senior HR professional. Other than clear illustration of concepts and demonstration of practical skills, the trainer offers top quality study materials including his own researches and his personal collection of useful resources, eg, books, articles, video, tools…etc. I also admire the effort he spent to promote professional ethics, as with great power it comes with great responsibilities. We also have lots of fun in and outside classes. In short, if this is an investment the ROI is exceptiona!