THE BLOG AS A WEB 2.0 TOOL FOR THE PLANNING ON PROBLEM SOLVING Education has not been immune to the impact of technologies Of Information and Communication; Teachers of the 21st century should adopt a new profile that covers a broad spectrum of competencies in relation to new technological resources. That is why I propose the use of the blog tool to be used in favor of the “Planning on problem solving” from the collaborative activity 1; becouse it is the most abundant node in Web 2.0 and provides an easy and affordable system to publish on the Internet individually or collectively. Blogs are among the most productive tools, since they probably offer a better relation between time and effort invested, on the one hand and results obtained, on the other. In addition, they are technological artefacts very interesting from the semiotic and structural point of view. Some of the most popular blogs are: Blogger (http://www.blogger.com/), Wordpress.com (http://wordpress.com/),...