In our work on the Southern California Earthquake Center Community Modeling Environment (SCEC/CME) Project (Jordan et al., 2003), we are developing computer systems to support dynamic distributed scientific collaborations. Scientists participating in SCEC collaborations are often willing to share their computer resources, particularly if in return they can gain access to computing capabilities that they do not currently possess. Interorganizational computer sharing can be difficult to achieve due to the many organizational and technical differences between groups. Recently, however, a new software technology called grid computing (Foster et al., 2001) has emerged which is designed to...

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