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Solutions_10 - Systems Analysis and Design in a Changing...

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Systems Analysis and Design in a Changing World, Fourth Edition 10-1 Chapter 10 – The Traditional Approach to Design Solutions to End-of-Chapter Material Review Questions 1. Explain the relationship and differences between a module and a program. A program is a set of modules that work together to perform all the required functions. A module is a relatively small set of statements that carry out a single function. 2. What is the purpose of the automation system boundary? How do you develop one? The automation system boundary defines which processes are going to be automated within the computer system, and which processes are part of the environment, or manual system. The system boundary, although needed for both structured and object-oriented development, needs to be defined explicitly for the structured approach. The object- oriented approach already has the system boundary defined in the use case diagram. The automation system boundary is developed at the DFD fragment level or below, by defining which processes are manual and which are automated. The boundary line is a line between these two processes. 3. What is a system flow chart used for? A system flow chart is used to depict the overall flow of information and control in a total system that consists of several programs. 4. What symbols are used on a system flow chart? The symbols include a rectangle for a program, a rectangle with curved sides or a disk for a file, a rectangle with a curved bottom line for a report, a circle with a tail for a file, a trapezoid for a manual operation, and an arrow or lightning bolt for a transmission or movement of data. 5. What is the purpose of a structure chart? A structure chart depicts the hierarchical structure of modules that make up a computer program. It shows the calling hierarchy as well as the data parameter that is passing between the modules.
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Systems Analysis and Design in a Changing World, Fourth Edition 10-2 6. What are the symbols used on a structure chart? The symbols include a rectangle for the module, a connection line or arrow for the calling structure, and small arrows with open circles for data couples or with black circles for flags. 7. Explain transaction analysis. Transaction analysis is the process of identifying a set of transactions (usually via DFD fragments) and developing a structure chart. Transaction analysis results in a structure chart with a calling structure to call a module for each transaction type. 8. Explain transform analysis. What is meant by the term central transform ? Transform analysis is the process of taking a DFD diagram and converting it to a structure chart. Transform analysis is based on the idea of “transforming” an input data flow into an output data flow. The central transform is the central process that transforms the data.
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