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Service level agreements (SLAs) are currently one of the major research topics in grid computing resulting in a language definition for specification of SLAs and corresponding system architectures. However, previous work solely addresses problems for monolithic grid jobs. The description of a workflow (job flow) considers characteristics of correlated sub-jobs, thus the problem grows more complex in terms of management, SLA specification, fault reaction etc. Therefore, this paper presents system architecture to ensure SLAs for grid-based workflows and a corresponding language for the SLA specification.