The technical potential of the WWW should be exploited in information services. Some systems give their users a forum or a number of fora to communicate with their fellow citizens. Indication of last update As a criterion for evaluation of quality of the service, it is vital to have an indication of service activity. As much information on the WWW is outdated, it is important to enable users to find current information. The updating of the pages should of cause be followed by frequent checking of included links.
Most systems are user oriented which means that they are based on their users' needs.
This is expressed by the way the information is presented, normally thematically or as a life cycle. Some systems are based more on traditional library practice, presenting their content according to a hierarchical structure or a classification system. A search facility in the information systems gives the users an alternative access to the resources. Developing a search engine should be related to the development of an indexing policy. Value adding Some systems have an added value which facilitates the users' appreciation of what the links contain, relieving them of the time consuming job of following links which are not pertinent to their information need.