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10 Chapter 10: The Traditional Approach to Design Systems Analysis and Design in a Changing World, 3rd Edition www.goupee.com
자료 내용
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10 Learning Objectives Develop a system flowchart Develop a structure chart using transaction analysis and transform analysis Write pseudocode for structured modules Systems Analysis and Design in a Changing World, 3rd Edition 2
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10 Overview Traditional approach to designing software Overview of structured models, model development process, related terminology How data flow diagrams are annotated with automation boundary information How analysis phase models are transformed into design models using system flowcharts, structure charts, and module pseudocode Integration into other design phase activities Applying approach to a three-layer architecture Systems Analysis and Design in a Changing World, 3rd Edition 3
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10 The Structured Approach to Designing the Application Architecture Application software programs Designed in conjunction with database and user interface Hierarchy of modules Design internal logic of individual modules Top-down approach DFDs with automation boundaries System flowcharts, structure charts, pseudocode Systems Analysis and Design in a Changing World, 3rd Edition 4
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10 The Automation System Boundary Partitions data flow diagram processes into manual processes and automated systems Processes can be inside or outside boundary Data flows can be inside and outside of boundary Data flows that cross system boundary represent inputs and outputs of system Data flows that cross boundaries between programs represent program-to-program communication Systems Analysis and Design in a Changing World, 3rd Edition 6
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10 DFD with Automation System Boundary Systems Analysis and Design in a Changing World, 3rd Edition 7
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10 The System Flowchart Representation of various computer programs, files, databases, and associated manual processes that make up complete system Frequently constructed during analysis activities Graphically describes organization of subsystems into automated and manual components Can show type of transaction processing system Batch Real time Systems Analysis and Design in a Changing World, 3rd Edition 8
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10 Sample System Flowchart for Payroll System Systems Analysis and Design in a Changing World, 3rd Edition 10
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10 The Structure Chart Describes functions and subfunctions of each part of system Shows relationships between modules of a computer program Simple and direct organization Each module performs a specific function Each layer in a program performs specific activities Chart is tree-like with root module and branches Systems Analysis and Design in a Changing World, 3rd Edition 12
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10 A Simple Structure Chart for the Calculate Pay Amounts Module Systems Analysis and Design in a Changing World, 3rd Edition 13
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10 Structure Chart for Entire Payroll Program Systems Analysis and Design in a Changing World, 3rd Edition 15
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10 Developing a Structure Chart Transaction Analysis Uses system flow chart and event table inputs Upper-level modules developed first Identifies each transaction supported by program Transform Analysis Uses DFD fragments for inputs Computer program ‘transforms’ inputs into outputs Charts have input, calculate, and output subtrees Systems Analysis and Design in a Changing World, 3rd Edition 16
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10 Event-partitioned DFD for the Order-Entry Subsystem Systems Analysis and Design in a Changing World, 3rd Edition 17
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10 High-level Structure Chart for the Customer Order Program Systems Analysis and Design in a Changing World, 3rd Edition 18
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10 Steps to Create a Structure Chart from a DFD Fragment Determine primary information flow Main stream of data transformed from some input form to output form Find process that represents most fundamental change from input to output Redraw DFD with inputs to left and outputs to right – central transform process goes in middle Generate first draft structure chart based on redrawn data flow Systems Analysis and Design in a Changing World, 3rd Edition 19
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10 The Create New Order DFD Fragment Systems Analysis and Design in a Changing World, 3rd Edition 20
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