As Service Oriented Architectures (SOA) and Web services are becoming widely deployed, the problematic of security is far from being solved. In an attempt to address this issue, the industry proposed several extensions to the SOAP protocol that currently reached different levels of standardization. However, no architectural guidelines have yet been proposed. In this paper we first outline the s...

In service oriented systems, Quality of Service (QoS) is a service selection driver. Users evaluate QoS at run time to address their service invocation to the most suitable provider. Thus, QoS has a direct impact on providers' revenues. However, QoS requirements are difficult to satisfy because of the high variability of Internet workloads. Workload variability cannot be accommodated with tradi...

During the last years, several approaches for the design of software services in service-oriented architectures (SOA) have been proposed. Often these approaches are too rough or too academic to provide guidance for real world SOA projects. Moreover, since the existing SOA design approaches are often not sufficiently validated, their successfulness in practice can be doubted. The research presen...