This paper describes an architecture for dynamically deploying Web Services, on-demand, over a grid or the Internet. The Dynasoar project is investigating an approach to grid computing in which there are no jobs, but only services. Rather than scheduling jobs, it automatically deploys a service on an available host if no existing deployments can meet the computational requirements. The architecture makes a clear separation between Web Service Providers, who offer services to consumers, and Host Providers, who offer computational resources on which services can be deployed. The paper describes the architecture, a prototype implementation, and new e-science models that it supports. 1
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