If an Information Architecture already exists, process decomposition is merely a continuation of the function decomposition in planning to discover lowest-level functions or highest-level processes.
A development project then uses, as a starting point, a subset of the Information Architecture established in ISP.
Developing a process hierarchy is a refinement of part of the diagram that is built previously for business functions.
Alternatively, activities of varying levels of detail already have been identified as part of a "business process chain" during Business Process Re-engineering.
If the development project is not expanding part of an already existing Information Architecture, then the analysis model that represents the scope of the project begins with a root function.
Whichever situation is the starting point, you proceed by subdividing the activity hierarchy.
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