Explain the differences between Gane and Sarson and Yourdon symbols. Provide examples of symbols that represent processes, data flows, data stores, and entities.
What will be an ideal response?
• The Gane and Sarson symbol for a process is a rectangle with rounded corners, while the Yourdon symbol is a circle. The name of the process is placed inside the symbol.
• Both symbol sets show a data flow as a line with an arrowhead, with the name of the data flow placed above, below, or alongside the line. The line’s arrowhead shows the direction in which the data flows.
• The Gane and Sarson symbol for a data store is a flat rectangle open on the right side. The Yourdon symbol is two parallel lines. The name of the data store is placed inside the symbol.
• An external entity is a person, department, outside organization, or other information system that provides data to the system or receives output from the system. The symbol for an external entity in both sets is a square. The Gane and Sarson symbol usually is shaded, and the name of the external entity is placed inside the symbol.
• Examples of process names are APPLY RENT PAYMENT, CALCULATE COMMISSION, ASSIGN FINAL GRADE, VERIFY ORDER, and FILL ORDER.
• Examples of data flow names are DEPOSIT, INVOICE PAYMENT, STUDENT GRADE, ORDER, and COMMISSION.
• Typical data store names might include PAYROLL ITEMS, CLASS ROSTER, INVENTORY LIST, and COURSE SCHEDULE
• Some examples of entity names might be CUSTOMER, BANK, VENDOR, or ACCOUNTING SYSTEM.
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