Traditionally, these great works have been elaborated by means of the order to different experts from the entrances or articles that comprised of the encyclopedia and, obvious, paying the corresponding honoraria of these experts. In year 2001, the founder of Wikipedia (href="http://www.wikipedia.com">http://www.wikipedia.com) propso the creation of an encyclopedia online following the method traditional. In a moment account occurred that using this system the time and the cost of elaboration of the work was impossible to assume with its resources, reason why varied the approach, and created a software structure that allowed that those were the own users that were writing and modifying, permanently, the entrances of the encyclopedia. This new approach, that before already had been developed in other projects that we will analyze more ahead, triggered a dynamics unknown until the moment and nowadays the encyclopedia has more of million entrances, adding different languages in what it is being constructed. Everything is not advantages, it is certain, and we will analyze it in the next article.