Do not know the principle of the Enneagram technique, I left worn by very practical and didactic explanations of the author. We discover there a very effective tool to understand and define the type of a person. But the tool is not restrictive as to give a simple "definition" of a character, it also takes into account the evolution of a being in his slices key ages (around 20 years and 40 ), then the effects of the amount of stress that can act on a mind at a given time. All these amalgams used to see the same type in different contexts and to grasp the understanding that fact and translations that resulting in his behavior.
This is not a book destine to offer ready-made wishing to find less conflict and more comfort in his behavior. It is above all an honest analysis of what we can each be in a type. Then everyone to understand at best the workings of one of its own and try to fit in everyday situations he encounters, to always strive towards the integration of its type and not regression or pathology .