The explosive growth of the web is at the basis of the great interest into web usage mining techniques in both commercial and research areas. In this paper, a web personalization strategy based on pattern recognition techniques is presented. This strategy takes into account both static information, by means of classical clustering algorithms, and dynamic behavior of a user, proposing a novel and effective re-classification algorithm. Experiments have been carried out in order to validate our approach and evaluate the proposed algorithm. Categories and Subject Descriptors H.2.8 [Database Management]: Database Applications— Data mining; I.5.3 [Pattern Recognition]: Clustering— Algorithms General Terms Algorithms, Experimentation Keywords Clustering, web personalization, web usage mining