This section describes the technique used to represent all of the activities of a business area as a hierarchy of functions and processes. The concept of elementary process is introduced as a means of knowing where to stop the decomposition. The rules governing decomposition are described. Particular emphasis is placed on not replicating the organizational hierarchy and the reasons why not.
Business activities can be decomposed into more detailed business activities. The purpose of function decomposition is to ease the comprehension and management of function information found in Business Area Analysis.
The technique of function decomposition represents the activities of a business area as a hierarchy of functions and processes. The hierarchy is independent of organizational structure, existing or planned, and of current procedures. It acts as a basis for verifying the understanding of what the enterprise is about, and for planning more detailed analysis. The decomposition diagram along with the associated dependency diagrams (Process dependency analysis) form a basis for system structure design and for procedure design during the Business System Design stage.
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