Chapter 04 - Systems Analysis Design 7th Edition Chapter 4...

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7 th Edition Chapter 4
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2 Chapter Objectives Describe data and process modeling concepts and tools, including data flow diagrams, a data dictionary, and process descriptions Describe the symbols used in data flow diagrams and explain the rules for their use Draw data flow diagrams in a sequence, from general to specific Explain how to level and balance a set of data flow diagrams
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3 Chapter Objectives Describe how a data dictionary is used and what it contains Use process description tools, including structured English, decision tables, and decision trees Describe the relationship between logical and physical models
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4 Introduction In chapter 4 & 5, you will develop a logical model of the proposed system and document the system requirements Logical model shows what the system must do Physical model describes how the system will be constructed
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5 Overview of Data and Process Modeling Tools Systems analysts use many graphical techniques to describe an information system A data flow diagrams (DFD) uses various symbols to show how the system transforms input data into useful information
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6 Data Flow Diagrams A data flow diagram (DFD) shows how data moves through an information system but does not show program logic or processing steps A set of DFDs provides a logical model that shows what the system does, not how it does it
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7 Data Flow Diagrams DFD Symbols
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8 Data Flow Diagrams DFD Symbols Process symbol Receives input data and produces output that has a different content, form, or both Contain the business logic, also called business rules Referred to as a black box
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9 DFD Symbols Data flow symbol Spontaneous generation Black hole Gray hole Data Flow Diagrams
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10 Data Flow Diagrams DFD Symbols Data store symbol
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11 Data Flow Diagrams DFD Symbols Entity Symbol Terminators Source Sink
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12 Creating a Set of DFDs Create a graphical model of the information system based on your fact-finding results Three-step process Step 1: Draw a context diagram Step 2: Draw a diagram 0 DFD Step 3: Draw the lower-level diagrams
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13 Creating a Set of DFDs
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Chapter 04 - Systems Analysis Design 7th Edition Chapter 4...

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