QoS-aware Service Selection – An Overview of Optimization Mechanisms and Decision Support for Complex Service-based Workflows

The problem of selecting services from a set of functionally appropriate ones based on non-functional service attributes such as cost or Quality of Service is wellrecognized in the literature. It is commonly referred to as Service Selection Problem. Related approaches thereby only address process structures and workflow patterns that are rather straightforward. The approach presented in the work at hand accounts for this limitation, considering complex, interlaced, acyclic as well as cyclic structured and unstructured workflows that had not been considered to date. In addition, an approach accounting for stochastic Quality of Service behavior is described.