DQ4: Most business processes are too complex to be explained in one DFD. Most process
models are therefore composed of a set of DFDs. The first DFD provides a summary
of the overall system, with additional DFDs providing more and more detail about each
part of the overall business process. Thus, one important principle in process modeling
with DFDs is the decomposition of the business process into a hierarchy of DFDs,
with each level down the hierarchy representing less scope but more detail.
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