This technical report compares the approaches, techniques and technologies used to implement support for Service Level Agreements (SLAs) in six of the European Commission’s Framework Programme 6 (FP6) funded projects. SLAs can be used to guarantee Qualities of Service (QoS) in Grid computing and provide a mechanism for the service provider to become sustainable through charging a customer for meeting the QoS they agreed. Thus, comparing the current approaches in these projects, assessing how they differ and where they are similar is necessary to understand possible gaps and potential problems with the solutions proposed by each project we assess. As the results of our comparison show, there is a great deal of common ground between the work of each project, but also some substantial variations.