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Chapter 6. Data-Flow Diagrams

1 Chapter 6. Data-Flow DiagramsTable of ContentsObjectives .. 1 Introduction to Data-Flow Diagrams .. 2 What are Data-Flow Diagrams ? .. 2An example Data-Flow diagram .. 2 The benefits of Data-Flow Diagrams .. 3 Case study .. 3 The different kinds (and levels) of Data-Flow Diagrams .. 3 Elements of Data-Flow Diagrams .. 4 Processes .. 4 Data-flows .. 5 Data stores .. 6 External entities .. 7 Multiple copies of entities and data stores on the same diagram .. 8 Context Diagrams .. 8 What is a context diagram? .. 8 Constructing a context diagram.

systems can be managed and modeled in a hierarchy of abstractions. Certain elements of any data-flow diagram can be decomposed (“exploded” ) into a more detailed model a level lower in the hierarchy. During this unit we shall investigate each of the three types of diagram in the sequence they are described above.

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