: Service-Oriented Architectures (SOAs) have been established as an IT strategy to support the on demand goal of business agility. Web services standards and their implementations are key enablement technologies for SOA which are maturing rapidly. There is a growing body of successful implementations of these technologies. However, experience of solving the wider business and architectural issues involved in designing a high-quality SOA for a particular enterprise still stands at an early stage. In this paper, we motivate the need for service modeling methodologies as means of tackling the external design of a business-focused SOA, identify some of the available candidate assets, and discuss how existing artefacts such as UML analysis diagrams can be leveraged for service modeling. 1 Motivation and Rationale for SOA In a 2004 interview for Info World, Grady Booch stated that “the fundamentals of eng like good abstractions, good separation of concerns never go out of style”, but poi...