relevance for electronic services. Whereas consumers expectations about information goods are often vague and transient, their … requirements are pronounced and specific when it comes to the functional and non-functional characteristics of electronic services …. Moreover, modular services can be combined and configured into service mashups that have the potential to meet complex consumer …

and consumer side (Papazoglou 2008). The provision of services with a defined QoS over electronic networks such as the Web …