SYSTEMS DEVELOPMENT ANALYSIS
APPLICATION DEVELOPMENT PROCESSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Entities
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Process
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Data Storage
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Data Flow
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Detailed explanation-1: -Data Storage – There are two variants of data storage – it can either be represented as a rectangle with absence of both smaller sides or as an open-sided rectangle with only one side missing. Data Flow – Movement of data is shown by pointed arrows.
Detailed explanation-2: -Data flow diagram notations For example, Yourdon and Coad notation uses circles to represent processes, whereas Gane and Sarson notation use rectangles with rounded corners.
Detailed explanation-3: -Gane and Sarson: Squares or rectangles denote external entities. Open-ended rectangles symbolize data storage. Arrows indicate data flow.
Detailed explanation-4: -The tasks performed on the data is known as process. Process is represented by circle. Somewhere round edge rectangles are also used to represent process.
Detailed explanation-5: -There are two distinct types of data flow diagrams: the logical DFD and the physical DFD.