The composite service model shows how a service at a higher level of abstraction is composed of smaller services with a more specific character. This office automation model includes an intermediate layer of services, but that is not necessary, you could also make a direct link to Microsoft Office, depending on the context. In this elaboration, only application services are modeled and included in the composition. However, in addition to application services, you can also define business services here. Consider the combination of the implementation of Office and a service desk for questions in case of problems. That is currently out of scope, but will become relevant at some point. Relevant here is that this creates a bottleneck in the ArchiMate modeling. If desired, this bottleneck can be resolved with serving relationships. Embedding ICT business services in the lower architectural layers.