Nowadays, evolution of enterprises is characterized by an aggressive economic world-wide competition, and often, by an unforeseeable environment in terms of needs and market demands. To survive in such a con- text, enterprises must collaborate, and they must be flexible and reactive enough to achieve this collabora- tion. In particular, with Service Oriented Architec- tures (SOA), a collaborative application can be now considered as an assembly of services, built on composi- tion of services, WfMS, and legacy applications. Thus, the way a business process is designed, executed, and monitored is changing.