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Web-services based systems present challenges for service level enforcement. Contrary to typical enterprise architectures where we are in control of all services and can easily specify and monitor service levels, here we need self-adapting approaches. The paper proposes techniques for service level enforcement in the context of a four step approach. The proposed techniques are: formalization of requirements using a service level objective, formalization of Web Service properties in a service level capability statement, and adaptive actions based on translucent replication of services. For an experimental evaluation we deployed a Web Service benchmark and our replication framework in Amazon's Elastic Compute Cloud. It provided continuous meeting of specified service levels.