Function Decomposition Diagram
A diagram for a typical system would usually be very large. Although visually very impressive, modifying the diagram would be very intimidating to the end users, and for this reason we usually factor systems into subsystems, subsystems into functions, and so forth.
Factoring a system into subsystems and functions is old concepts based on the rule of divide and conquer! Unfortunately we tend to do this without any rhyme on reason. The result is invariably a collection of illogical subsystems.
Combining all logical units, which form functions in the physical working procedure, should be the basis for bringing about the division of the system.
There is only one symbol: the process in the diagram. The processes are connected to form a treelike structure.
The top process is called the root, representing the entire system for which you are defining requirements. The root process is explored or factored into subsystems, functions and tasks. The number of exploded levels will depend upon the size of the project. Each process in the diagram should be named in such a way that it depicts the action performed by the process very clearly to the reader of the diagram.
The processes are numbered and there is a standard guideline to do this:
(i) The root process is numbered 0.
(ii) The root process is factored into processes that are numbered consecutively as 1, 2, 3... and so on.
(iii) With subsequent factoring (also called leveling) of any process into sub processes, each sub process is numbered as the decimal of the parent process.
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