5.6.1 Service components We modified the component diagram from the analysis model. In that diagram, all the components used for registration processing were defined as services . We changed the name of the Customer Registration use case component to Registration Processor, which we think better reflects its function of processing customer registration requests. Then we added a new component called Customer Registration, which consolidates the functionality for deciding whether to insert the customer information into the CRM Registration Service or to send it to the insufficient credit service for further credit validation. The changes can be seen in Figure 5-21.