lec6-2 - Methodologies 6 Data Flow Diagrams (DFDs) A...

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MIE350: Software Development Methodologies 1 MIE 350 Data Flow Diagrams: The Saga Continues … Michael Gruninger Information Engineering Centre gruninger@mie.utoronto.ca
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MIE350: Software Development Methodologies 2 Outline • Review – Process modeling • Concepts • Data flow diagrams • DFD Syntax
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MIE350: Software Development Methodologies 3 Readings • Textbook, Ch 5
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MIE350: Software Development Methodologies 4 Process Model • A formal way to represent how a (business) system operates Why?
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MIE350: Software Development Methodologies 5 Process Modeling • Continued refinement of requirements and use cases Requirements Use cases Process models More and more detail about WHAT the system will do
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MIE350: Software Development
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Unformatted text preview: Methodologies 6 Data Flow Diagrams (DFDs) A technique for diagramming business processes and the data passed between them One way to do process modeling (there are others) MIE350: Software Development Methodologies 8 External Entity Processes Data flows Data stores MIE350: Software Development Methodologies 9 MIE350: Software Development Methodologies 10 Building DFD Steps Build Use Cases Draw Context Diagram Create DFD fragment for each use case Organize DFD fragments into Level 0 Draw Level 1 based on steps within use cases Continue to lower levels Validate DFDs...
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lec6-2 - Methodologies 6 Data Flow Diagrams (DFDs) A...

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