International Journal of Web Applications Samia Ait Adda, Amar Balla 6 3 2014 http://www.dline.info/ijwa/fulltext/v6n3/3.pdf Search engines have become an integral part of our information environment. Gradually more they are replacing the role of libraries in facilitating information discovery and access. The learner is one of the most remarkable users of the search engines on the Web. The purpose of this analysis is to identify the domain concepts that are most asked on the Web and to store them into the learners model Knowledge as concepts not well mastered. During this article, we want to underline the inherent reasons that push learner to search for domain concepts in the outer of the learning platform by the use of the search engine; so we introduce an hypothesis which says that all concepts sought on the web by use of the search engine can be considered as knowledge poorly or badly acquired by learners and requires support both by the course author to restructure and adapt the course content and from tutor to monitor the learner on these identified concept.