Services that are identified in your organization are either used or created in the development process. The guidelines and principles that are defined in architecture come to life during the development process.
The process in an SOA is a little different from traditional projects in a silo, that is, they are in an isolated environment, less dependent on the rest of the organization. It is, however, very similar to any integration project. So if you are familiar with integration projects, you won't have a lot of trouble working in an SOA environment, as far as development is concerned. The following figure shows the development process for a service.