Monitoring Quality of Service in Service-oriented Systems: Architectural Design and Stakeholder Support ausgeführt zum Zwecke der Erlangung des akademischen Grades eines

ii In a service-oriented system, services are utilized to perform inter- and cross-organization business tasks with few human intervention. Between a service provider and a service consumer contracts can exist containing performance-related Quality of Service (QOS) agreements, called Service Level Agreement (SLA). A services provider must prevent SLA violations in order to avoid serious financial consequences and a diminished reputation. Service consumers want to ensure that they get the service they pay for. In order to prevent and detect violations of the performance-related agreements during the SLA’s validity, a monitoring infrastructure is required. To design an architecture of a QoS monitoring infrastructure, many architectural design decisions must be faced, depend on business and technical requirements. At early stages, the infrastructure’s requirements are fuzzy and incomplete, making later changes inevitable. The design process and the specification of the negotiated performance-related QoS properties involve various differently skilled stakeholders, ranging from business to technical experts. In this thesis, we present an architectural design decision model that covers design decisions abou