Enterprise Architecture Executive Handbook - U.S. Coast Guard

Service Oriented Architecture (SOA)
Service Oriented Architecture (SOA) is a software design methodology that uses loosely coupled services
to perform business functions and processes. SOA is not a specific technology nor is it a final destination;
it is an architectural path with a set of design principles for system development.
The most essential element of SOA is a service, which is a logical representation of a repeatable business
activity that is well-defined and self-contained. A service has a published interface that developers can use
when building different applications and business processes. In essence, SOA centers on developing a
service for a single application, project, or organization and reusing that service across the enterprise.
In 2006, the Commandant, as part of his CIAOs, called for e-Coast Guard (eCG) and SOA
Implementation (CIAO #10). The goal of this mandate is to enhance USCG mission performance through
optimal C4&IT investments and management.
In support of CIAO #10, the Office of Enterprise Architecture and Governance worked with graduate
students from Carnegie Mellon University to develop a USCG SOA implementation plan. The
implementation plan outlines an approach that the USCG can consider as it moves forward with
implementing SOA. The approach includes a SOA roadmap and maturity model concepts; ideas for SOA
process, governance, and outreach; and private sector case studies.
In addition, the USCG Operations Systems Center (OSC), whose primary function is to provide full lifecycle
support for operationally-focused information systems, is working to implement SOA as it develops
and enhances USCG systems. As part of this effort, OSC successfully implemented an instance of SOA
for the Authoritative Parts Service (APS) and selected an enterprise service bus for future SOA
development.
14