A key SOA end-goal is a service portfolio exhibiting a clean architecture. Technical and industry vertical business domain models are useful starting points for development of an organization’s unique service portfolio. Service design and interface design are small pieces in a larger set of programs that must be managed in order to establish highly effective IT service delivery, collaboration, and trust.
Initiating complimentary projects such as an application rationalization, business process management or enterprise architecture is an excellent mechanism to understand IT dynamics, decompose the business domain, and determine what software assets (and services!) should support business processes.