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NAREGI is a Japanese National Grid Project started in 2003, whose chief aim is to develop a set of Grid middleware to serve as a basis for future e- Science. In this paper, we describe a software tool called NAREGI-PSE (Problem Solving Environment), which aims to supports the scientists?? works for scientific computer simulations on widely-distributed heterogeneous grid computing environment. Its core component is implemented as WSRF services based on some grid standards, such as Application Contents Service specification. NAREGI-PSE achieves functions sharing peculiar applications in each research community, which is implemented as Virtual Organization. The shared application program is easily compiled and deployed to grid environment using NAREGI-PSE.