Functional decomposition diagrams

The purpose of the functional decomposition diagram is to show on a single page the capabilities of an organization that are relevant to the consideration of an architecture. By examining the capabilities of an organization from a functional perspective, it is possible to quickly develop models of what the organization does without being dragged into an extended debate on how the organization does it. Once a basic functional decomposition diagram has been developed, it becomes possible to layer heat-maps on top of this diagram to show scope and decisions. For example, the capabilities to be implemented during the different phases of a change program. This diagram can be enriched using links to other parts of the model, to indicate, for example, which application supports which function, which role uses which function, and so on.