The value of information accumulated on the Web is enhanced when it is provided to the user who faces a problematic situation that can be solved by the information. The authors have investigated a task-oriented menu that enables users to search for mobile Internet services not by category but by situation. Construction of the task-oriented menu is based on a user modeling method that supports descriptions of user activities, such as task execution and defeating obstacles encountered during the task, which in turn represents the users’ situations and/or needs for certain information. They built task models of the mobile users that cover about 97% of the assumed situations of mobile Internet services. Then they reorganized “contexts” in the model and designed a menu hierarchy from the viewpoint of the task. The authors have linked the designed menu to the set of mobile Internet service sites included in the i-mode service operated by NTT docomo, consisting of 5016 services. Among them, 4817 services are properly connected to the menu. This chapter introduces a framework for a real scale task-oriented menu system for mobile service navigation with its relations to the SNS applications as knowledge resources.
Toward Task-oriented Mobile Internet Service Navigation-Ontology-based User Modeling Method with Obstacles in Daily Life-