The Domain-Driven Design language defines the concept of a service. Services are responsible for orchestrating various business logic processes. Typically, they are an entry point for use cases and create or manage objects of the domain model. Services hold the single business process steps together.

If you map this concept with the idea and contents of the Entity Control Boundary packaging, you will see that it fulfills the same purpose as boundaries or controls, respectively. In Java EE, these services would therefore be implemented as EJBs or CDI managed beans. Services that represent the entry point of a use case are implemented as boundaries; whereas services that orchestrate further business logic, access databases or external systems represent controls.