In recent years, many people interested in libraries are discussing about using circulation data for library service, for example forum in “Library Fair”. A few libraries started to use library system with circulation data. But it is not enough that discussing how library can use circulation data for library improvement. This article describes recent discussion and activities of circulation data, and consider about new library in the web age. In the result, we propose 4 types of circulation data usage and requirements for achieving new library model. In these requirements, we emphasized building user's community in library. At last, we introduce web service named "Shizuku2.0" that supports community oriented library systems.
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