The fourth category, need for intelligent Web agents according to the needs of individual users reduce information content of the application, some customers access to data is not intended to be used directly but in order to organize their own database as needed. For example, the education sector to build a large item bank, the examination item bank in the subject will be removed some of the constituent papers, packaging papers and then into the XML file, then let in all schools, through a filter, filter out all the answers, and then sent to all candidates before the unfiltered content can be delivered directly to the hands of a teacher.