Abstract
Services Oriented Architectures have provided ?exibility and agility for service consumers to build their business processes. An important issue concerning the service orchestrations supporting business processes is the Quality of Service (QoS). Service consumers put more and more importance to the QoS of their service orchestrations to be more competitive. Therefore, they need to know how much the service orchestrations fit their QoS expectations in order to measure their satisfaction. In this context, we propose an approach to evaluate the satisfaction degree of service orchestrations according to the service consumers expectations from QoS point of view. This approach is based on Work?ow patterns aggregation rules and on the application of a Multi-Criteria Decision Making (MCDM) method. It helps service consumers to interpret the Quality of Service of their service orchestrations and to make a decision whenever they are no longer satisfied.