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The Open Grid Services Architecture (OGSA) is addressing the challenge of integrating services spread across distributed, heterogeneous, dynamic virtual organizations, using the concepts and technologies from both the Grid and Web service communities. The Web service community has realized that Web services can reach their full potential only if there exists a mechanism to describe the various interactions between the services and dynamically compose new services out of existing ones. This situation is true in the case of Grid services as well. In this paper, we analyze existing technologies that address workflow for Web services, and try to leverage them for Grid services, which have different needs from standard Web services. We discuss these special needs and present the Grid Services Flow Language (GSFL), which addresses them for Grid services within the OGSA framework.