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Chapter 6- The Traditional Approach to Requirements

Chapter 6- The Traditional Approach to Requirements -...

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6 Systems Analysis and Design in a Changing World, Fifth Edition
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6 Learning Objectives Explain how the traditional approach and the object- oriented approach differ when modeling the details of a use case List the components of a traditional system and the symbols representing them on a data flow diagram Describe how data flow diagrams can show the system at various levels of abstraction Systems Analysis and Design in a Changing World, 5th Edition 2
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6 Learning Objectives (continued) Develop data flow diagrams, data element definitions, data store definitions, and process descriptions Develop tables to show the distribution of processing and data access across system locations Systems Analysis and Design in a Changing World, 5th Edition 3
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6 Overview What the system does and what event occurs – activities and interactions (use case) Traditional structured approach to representing activities and interactions Diagrams and other models of the traditional approach RMO customer support system example shows how each model is related Systems Analysis and Design in a Changing World, 5th Edition 4
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6 Traditional vs. Object-Oriented Approaches Systems Analysis and Design in a Changing World, 5th Edition 5 Figure 6-1
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6 Requirements for the Traditional and OO Approaches Systems Analysis and Design in a Changing World, 5th Edition 6 Figure 6-2
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6 Data Flow Diagrams (DFDs) Graphical system model that shows all main requirements for an IS in one diagram Inputs/outputs Processes Data storage Easy to read and understand with minimal training Systems Analysis and Design in a Changing World, 5th Edition 7
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6 Data Flow Diagram Symbols Systems Analysis and Design in a Changing World, 5th Edition 8 Figure 6-3
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6 DFD Fragment Showing Use Case Look Up Item Availability from the RMO Systems Analysis and Design in a Changing World, 5th Edition 9 Figure 6-4
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6 DFD Integrates Event Table and ERD Systems Analysis and Design in a Changing World, 5th Edition 10 Figure 6-5
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6 DFD and Levels of Abstraction Data flow diagrams (DFDs) are decomposed into additional diagrams to provide multiple levels of detail Higher-level diagrams provide general views of system Lower-level diagrams provide detailed views of system Differing views are called levels of abstraction Systems Analysis and Design in a Changing World, 5th Edition 11
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6 Layers of DFD Abstraction for Course Registration System Systems Analysis and Design in a Changing World, 5th Edition 12 Figure 6-6
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6 Context Diagrams DFD that summarizes all processing activity for the system or subsystem Highest level (most abstract) view of system Shows system boundaries System scope is represented by a single process, external agents, and all data flows into and out of the system Systems Analysis and Design in a Changing World, 5th Edition 13
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6 DFD Fragments
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