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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 .. 9 Level 1 Data-Flow Diagrams .. 9 What is a level 1 DFD? .. 9 Constructing level 1 DFDs .. 10 Decomposing Diagrams into level 2 and lower hierarchical levels .. 10 What is a level 2 (or lower) DFD? .. 11 Constructing level 2 (and lower) DFDs functional decomposition.

Data-flow diagrams (DFDs) model a perspective of the system that is most readily understood by users – the flow of information through the system and the activities that process this information. Data-flow diagrams provide a graphical representation of the system that aims to be accessible to computer specialist and non-specialist users alike.

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