There are multiple approaches to defining the portfolio of services that will be delivered as part of an SOA. There is no one-size-fits-all for an approach to identify the right services needed to support current and future requirements. Service should be cataloged into service domains that will define the ownership, funding, usage rights, and categorization of the services.

Service domains are often driven by projects—to understand the ownership of services and how they can facilitate cross-organization business processes, these need to be realigned with business domains. However, business domains get restructured, so these domains should not be confused with an organizational model, which is normally a management structure to facilitate the people organization within departments of a company. SOA domains should be based on people, processes, and outcomes that are required to meet the organization's goals. With this in mind, the collection of services into domains...