An organizational state change that triggers processes; may originate from inside or outside the organization and may be resolved inside or outside the organization.

Business Function delivers business capabilities closely aligned to an organization, but not necessarily explicitly governed by the organization.

A hierarchical listing of Processes. Processes are comprised of more granular Processes. A Process can belong to more than one parent Process i.e., a common Process. Process is essential to understand the constituent components of value streams/ value stream stages in a hierarchical sequences and to identify the association with the related entities.  

Business Rules defines a constraint on one or more aspects of the Process that is intended to assert business structure or influence the behavior of the same.