To the adepts the tourism provokes a positive impact very, believes that it helps to eliminate differences, making possible it lends survival of the societies and an increasing intellectual understanding. In against departure the critics they argue that great number of the tourists in its trips, leaves its ways and its moral in house, looking for exotic places far from house and them social restrictions, and its behaviors can vary completely in the trips. Philip Vasan describes an additional similar source. The perception of the tourism kept for the local residents to modify if throughout the time is not uncommon, and to express this sequence and the time during which the social values if modify, Lage et al (2000) cites the index of irritation level or irridex, concept formulated for Doxey, believing that this resultant manifestation of the contact between the tourist and the receiver, cannot completely be prevented, therefore in last instance anger to destroy the tourism unless it is kept under control. Irridex has covered four levels of reaction, on the part of receiving population, the euphoria, apathy, annoyance and the antagonism. In the initial phase the visitors and the investors well are come euphorically, for the promise of economic benefits and same for the curiosity. Also in this period of training, the receiver can become accessible and positive linkings can be kept, later to the population start to understand its economic dependence, they are apticos when they perceive that they had been absorbed by the activity, and nor more they withhold the control or they are consulted on the environment and its destination, when they become if apticos, the contact between the visitors and the community passes to be lead in a base of payment for service, the human agents become annoying and disappointed. Later the tourists are seen and estereotipados as chupins or teething rings of the good things, the receiving population start to express doubts, being born then the antagonism. .