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Chapter+9+-+2 - Process Modeling Chapter 9 Continued When...

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Process Modeling Chapter 9 - Continued
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When to Draw Process Models Strategic systems planning Enterprise process models illustrate important business functions. Business Process Redesign (BPR) “As is” Process Models facilitate critical analysis. “To be” Process Models facilitate improvement. Systems Analysis Model existing System including its limitations. Model target System’s logical requirements. Model candidate technical solutions. Model the target technical solution.
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Classical Structured Analysis 1.Draw top-down physical DFDs that represent current physical implementation of the System. 2.Convert physical DFDs to logical equivalents. 3.Draw top-down logical DFDs that represent improved System. 4.Describe all Data Flows, Data Stores, Policies, and Procedures in Data Dictionary. 5.Optionally, mark up copies of the logical DFDs to represent alternative physical solutions. 6.Draw top-down physical DFDs representing target solution. Note: Rarely practiced anymore because it is cumbersome & time-consuming.
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Modern Structured Analysis 1. Draw context DFD to establish initial project scope. 2. Draw functional decomposition diagram to partition the System into subsystems. 3. Create event-response or use-case list for the System to define Events for which the System must have a response. 4. Draw an Event DFD (or event handler) for each Event. 5. Merge Event DFDs into a System Diagram (or, for larger systems, subsystem diagrams). 6. Draw detailed, Primitive DFDs for the more complex Event Handlers. 7. Document Data Flows and Processes in Data Dictionary.
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Structured Analysis Diagram Progression (1 of 3)
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Structured Analysis Diagram Progression (2 of 3)
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Structured Analysis Diagram Progression (3 of 3)
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Chapter+9+-+2 - Process Modeling Chapter 9 Continued When...

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