Lenk C Homework Chapter 5 - Chris Lenk Professor Burns...

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Chris Lenk Professor Burns Systems analysis and design 6/10/13 Review Questions Chapter 5 1. Data and process modeling can be divided into two different models, the logical model and the physical model. The logical model shows what a system must do while a physical model shows how the system will be constructed. Three techniques that achieve this include data flow diagrams, data dictionaries, and process descriptions. 2. The process symbol in Gane and Sarson is a rounded edge rectangle. Data flow is a directional line. Data store is symbolized by a long rectangle. Finally external entitys are symbolized by squares. Some examples of these include apply payments, bank deposits, students, and customers. 3. The context diagram expands into diagram zero. Diagram zero goes into further detail of the processes at hand. 4. An exploded DFD is simply a more detailed version of the context diagram. The higher level is called the parent diagram and the lower level is known as the child diagram.
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