A Case-Based Information Filtering System for the World Wide Web

A content vector, that is an array of values that represents the information content suitable for the Vector space model matching, as explained in 4.; with paired justifications (They express the provenience of that element, if from initial interview or the current active stereotype, or feedback, etc.) Moreover, changes to the User Model are regulated using a fixed hierarchy, so that lower items in the hierarchy cannot overwrite the values set by higher items. For example an element modified by the user feedback is not affected by changes from the stereotypes, etc. Contexts are initializated all the same for every user that has a non-zero value in her/his user model content vector for each cluster having one or more non-null contexts. Then these contexts are copied in the user's model and evolves indipendently according to the single user history. A set of user keywords each weighted with a value representing its actual importance for the user.