describes and analyzes the access and the information retrieval in the World Wide Web. First of all, it studies the operation of the motors search and the metasearchers. Secondly, it is shown the state of situation of the information retrieval at the Web, through tríad system-document-user. And finally, it evaluates the performance of search and metasearch motors in two preexperiments. The first one analyzes, emulating the conduct of the user, the arrangement by relevance of first the ten and twenty results of five motors search of greater cover in response to expressions search nonstructures. And the second, calculates the traditional measures of precision and thoroughness, determines the sly proportion of URLs and similarity between five finders and three metabuscadores using for its interrogation little frequent words.
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