This paper describes a new framework for and educational use of the WWW database and its application in classroom lessons. Although the WWW has an enormous amount of useful information, it is not straightforward for school teachers to use such information for their classroom lessons. The reason is that databases on the WWW are constructed from the designer's own point of view. A point of view here means a way of considering data. The problem is that this point of view does not always match the context of classroom lessons. We point out the importance of the information which is given with a link. We call it as "link information". It plays the role of an interface to quote information, whose original point of view is different and changes the point of view form the original one to that of the user. We present the content of the link information for investigative learning. We propose to build a WWW database which presents explicitly the purpose and the point of view of the usage of WWW data and utilizes the rich information available on the WWW by virtue of "link information." We call it "User Database", because it adopts on the point of view of its user. We have designed a new classroom lesson style of investigative learning activities which utilize such a "User Database". We have investigated its effectiveness through classroom lessons in a Japanese junior high school.
