INTRODUCTION TO SOFTWARE ENGINEERING
OVERVIEW OF SOFTWARE ENGINEERING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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By levelling a DFD we mean:
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splitting it into different levels
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make its structure uniform
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expanding a process into one with more sub-processes giving more detail
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summarizing a DFD to specify only the essentials
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Explanation:
Detailed explanation-1: -The level 4 DFD is an expansion of the process in the level 3 DFDs. And the level 5 DFD is an expansion of the process in the level 4 DFD etc. Levels stop when the analyst feels enough detail has been reached. All processes may require different levels of abstraction.
Detailed explanation-2: -Structure chart is a chart derived from Data Flow Diagram. It represents the system in more detail than DFD. It breaks down the entire system into lowest functional modules, describes functions and sub-functions of each module of the system to a greater detail than DFD.
Detailed explanation-3: -In a data flow diagram Functional primitive process is at the most detailed level.
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