Week 6_Petrie's Electronics Cases Closeout_ESSAY
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week_3_chapter_6_petries_electronics_case_answers.docxWeek 3 Chapter 6 Petrie’s Electronics Case Questions Grading Rubric
Petrie’s Electronics Case Questions Solutions (10 Points)
1. Are the DFDs in Figures 6-1 and 6-2 balanced? Show that they are, or are not. If they are not balanced, how can they be fixed? (5 points)
They are balanced. On both the Context Diagram and the Level-0 there are 2 inflows to the system from the source customer (purchases and coupons) and three outflows (reports, tailored promotions and coupons) from the system to the sink Customer.
5. Why is it important for the team to create DFDs if they are not going to write the actual system code themselves? (5 points)
Creating DFDs force analysts (and students) to think about the core processes in a system, the data they use, the sources of that data, the information the processes generate, and where the information goes. All of this information is essential in design and building of a system, even if all of its components are purchased off-the-shelf.
