Transcription of Chapter 6. Data-Flow Diagrams
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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.
• Level 2 (and lower) data-flow diagrams — a major advantage of the data-flow modelling technique is that, through a technique called “levelling” , the detailed complexity of real world systems can be managed and modeled in a hierarchy of abstractions.
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