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Structured Analysis Lec 1 - Structured Structured Systems...

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Structured Systems Analysis: Data Flow Diagrams EGA/ERLJ IE 154
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Objectives for Today ring2 Define Structured Systems Analysis(SSA) ring2 Know the different techniques of SSA ring2 Define Data Flow Diagrams (DFD) ring2 Draw the components of DFDs Know leveling concepts of DFDs ring2 ring2 Know the strategies of constructing DFDs ring2 Solve Examples
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Structured Systems Analysis ring2 SSA is a systems approach to the analysis and design of information systems. ring2 It was produced for a UK government office concerned with the use of technology in government from 1980 onwards.
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Objectives of SSA ring2 Ensure that projects can successfully continue should a loss of staff occur without damaging effect on the project ring2 Develop overall better quality information systems ring2 Improve the way in which projects are controlled and managed ring2 Allow more effective use of experience and inexperienced staff and their development ring2 Make it possible for projects to be supported by computer based tools ring2 Improve communication between participants in a project
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Characteristics of SSA ring2 Bounding of Context: circle6 Structured analysis establishes the scope of the effort and defines the area of concern ring2 Limitation of Information: circle6 The specifications are so organized so that details do not overwhelm the reader
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Characteristics of SSA ring2 Top-Down Decomposition circle6 The information is organized in a top down manner, beginning with an overview, going down to the different levels of detail. ring2 Levels of Detail circle6 Detail is introduced in a gradual manner. A top level representation of a subject must be coupled with a gradual introduction of more detailed information
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Objectives for Today ring2 Define Structured Systems Analysis(SSA) ring2 Know the different techniques of SSA ring2 Define Data Flow Diagrams (DFD) ring2 Draw the components of DFDs Know leveling concepts of DFDs ring2 ring2 Know the strategies of constructing DFDs ring2 Solve Examples
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Techniques of SSA ring2 Logical Data Modeling ring2 Data Flow Modeling ring2 Entity Behavior Modeling
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Techniques of SSA ring2 Logical Data Modeling circle6 This is the process of identifying, modeling and documenting the data requirements of the system being designed. The data are separated into entities (things about which a business needs to record information) and relationships (the associations between the entities).
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Logical Data Modeling
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Techniques of SSA ring2 Data Flow Modeling circle6 This is the process of identifying, modeling and documenting how data moves around an information system. circle6 Data Flow Modeling examines processes (activities that transform data from one form to another), data stores (the holding areas for data), external entities (what sends data into a system or receives data from a system), and data flows (routes by which data can flow).
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Data Flow Modeling
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Techniques of SSA ring2 Entity Behavior Modeling -- the process of identifying, modeling and documenting the events that affect each entity and the sequence in which these events occur.
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