Recruitment of the services of "Google Analytics" on the part of an entity of public law in order to improve the performance of the corporative page, the information and the services loaned to the citizen. The information that is treated can contain data of personal character. The IP address is considered personal datum whenever he makes a determinate physical person identifiable. The principles and duties to the LOPD, especially, the duty of information and the principle of consent are recommended to subject its treatment to.