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Preparing Data Flow Diagrams

27 August, 2015 - 13:02

We use DFDs in two main ways. We may draw them to document an existing system, or we may create them from scratch when developing a new system. Construction of DFDs for new systems will be described in the systems development chapters (Chapters 6 and 7). In this section, we explain a process for deriving a set of DFDs from a narrative that describes an existing system.