An Organization/Business Process Matrix provides insight into the relationship between organizational units (business actors and business roles) and business processes. A cross-mapping between these two elements visualizes who is responsible for what activities within the organization.
The matrix can be used to identify where there is potential overlap in the processes used at the organizational level. It shows whether there are departments within the organization that perform the same operations as other departments. When this is identified, the question can be asked whether the processes are set up efficiently enough. The matrix provides immediate insight into which processes are affected, so that targeted improvement actions can be taken.
More information
For additional information about creating an Organization/Business Process Matrix, please refer to Chapter 8, Section 8.2.1.2, of my book Getting Started with Enterprise Architecture.