The "service" paradigm is much more coarse-grained than method calls or sub-routines and therefore provides a better abstraction for developing software that can be effectively used in Grid systems and applications. The recent development of the Open Grid Services Architecture (OGSA) is an important step in this direction. A question that has been discussed within the Global Grid Forum (GGF) is to determine what would be a useful means of integrating Grid services with other technologies and to identify if there are common deployment mechanisms for both Grid and Web services. One possible approach, described in this paper, is to integrate Grid services with existing middleware technologies, which enable service interfaces to be defined in XML while supporting the discovery, registration and leasing of services and can allow third party libraries to also co-exist.
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