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Service Level Agreements are an essential foundation for the realisation of Business Grids as they provide a mechanism for a service provider to charge a customer for meeting an agreed quality of service. However, once a Service Level Agreement has been formed it may need to be re-negotiated as the requirements of the business participants change. This paper describes an abstract, domain-independent protocol for the renegotiation of an agreement, including Service Level Agreements formed using the WS-Agreement standard. The protocol is based on the principles of contract law to make the new agreements formed using it legally-compliant. It allows for multi-round re-negotiation in a network environment where messages may be lost, delayed, duplicated and re-ordered.
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