The benefits of Service Oriented Architecture (SOA) are not only reducing the Total Cost of Ownership (TCO) by reusing service, streamlining business process, etc. - it also reduces the total number of resources required to adopt SOA enterprise wide. The SOA - Development Organization shall generally be identical to the deployment model and by distributing the tasks by the tiers IT organizations shall need fewer very skilled resources (Presentation).
The Architecture Framework lays the foundation for the enterprise and the Agile Project Management enables large organizations successfully manage and deploy SOA enterprise wide. Without adopting either - the traditional (structured) development methodology and process does not enable enterprises achieve the full benefit.