4. The method of claim 1 , wherein the knowledge elements include bibliographic data, and determining the first value is performed using the bibliographic data from the similar knowledge elements.
4. The method of claim 1 , wherein the knowledge elements include bibliographic data, and determining the first value is performed using the bibliographic data from the similar knowledge elements. 5. The method of claim 4 , wherein the bibliographic data for at least some of the similar knowledge elements includes information identifying the user.