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Are the DFDs in PE Figures 6-1 and 6-2 balanced? Show that they are, or are not. If they are not balanced, how can they be fixed?

Are the DFDs in PE Figures 6-1 and 6-2 balanced? Show that they are, or are not. If they are not balanced, how can they be fixed?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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6-37. Are the DFDs in PE Figures 6-1 and 6-2 balanced? Show that they are, or are not. If they are not balanced, how can they be fixed?

PE TABLE 6-1: Four Core Functions of Petrie's Customer Loyalty System Function Description Record When a customer makes a purchase, the transaction must be recorded in the customer loyalty system, as the rewards the system generates are driven by customer purchases. Similarly, when a customer uses a coupon generated by the system, it must also be recorded, so that the customer activity records can be activities updated to show that the coupon has been used and is now invalid. Send Data about customer activities provide information about what types of products customers tend to buy and in what quantities. This information helps promotions determine what sales promotion materials are best targeted at what customers. Customers who buy lots of video games should receive promotions about games, game platforms, and HD TVs, for example. Generate Data about customer activities is used to generate coupons for future purchases. Those coupons must be made available to customers, either as paper point- coupons sent in the mail or online, in the customer's private account area. Once created, the customer activity database needs to be updated to show the redemption creation of the coupon. The loyalty points needed to create the coupon must be deducted from the customer's total points. coupons Generate From time to time, either in the mail or electronically, customers need to be sent account reports that show their recent purchases, the coupons they have customer been issued that have not yet been redeemed, and the total points they have amassed from their purchases. reports -Reports- No Customer Escapes System -Purchases Customer FTailored Promotions Customer -Coupons- -Coupons PE FIGURE 6-1 Context diagram. -Coupons Record Customer Activities Customer Transactions Customer Activity Records -Purchases Customer Activities Coupon Info Marketing Database Send Promotions Customer Activities Promotions Customer Generate Point Redemption Coupons Activity Info Tailored Promotions -Coupons- Customer -Reports- Generate Customer Reports Product Info Product Database PE FIGURE 6-2 Level-1 DFD.
Transcribed Image Text:PE TABLE 6-1: Four Core Functions of Petrie's Customer Loyalty System Function Description Record When a customer makes a purchase, the transaction must be recorded in the customer loyalty system, as the rewards the system generates are driven by customer purchases. Similarly, when a customer uses a coupon generated by the system, it must also be recorded, so that the customer activity records can be activities updated to show that the coupon has been used and is now invalid. Send Data about customer activities provide information about what types of products customers tend to buy and in what quantities. This information helps promotions determine what sales promotion materials are best targeted at what customers. Customers who buy lots of video games should receive promotions about games, game platforms, and HD TVs, for example. Generate Data about customer activities is used to generate coupons for future purchases. Those coupons must be made available to customers, either as paper point- coupons sent in the mail or online, in the customer's private account area. Once created, the customer activity database needs to be updated to show the redemption creation of the coupon. The loyalty points needed to create the coupon must be deducted from the customer's total points. coupons Generate From time to time, either in the mail or electronically, customers need to be sent account reports that show their recent purchases, the coupons they have customer been issued that have not yet been redeemed, and the total points they have amassed from their purchases. reports -Reports- No Customer Escapes System -Purchases Customer FTailored Promotions Customer -Coupons- -Coupons PE FIGURE 6-1 Context diagram. -Coupons Record Customer Activities Customer Transactions Customer Activity Records -Purchases Customer Activities Coupon Info Marketing Database Send Promotions Customer Activities Promotions Customer Generate Point Redemption Coupons Activity Info Tailored Promotions -Coupons- Customer -Reports- Generate Customer Reports Product Info Product Database PE FIGURE 6-2 Level-1 DFD.
CASE: Petrie Electronics PETRIE ELECTRONICS Structuring Systems Requirements: Process Modeling Jim and Sanjay chatted in Jim's office while they waited for Sally to arrive. "Good work on researching those alternatives," Jim said. "Thanks," replied Sanjay. "There are a lot of alternatives out there. I think we found the best three, considering what we are able to pay." Just then Sally walked in. "Sorry I'm late. Things are getting really busy in marketing right now. I've been putting out fires all morning." Sally sat down at the table across from Jim. "I understand," Jim said. "But to stay on schedule, we need to start focusing on the specifics of what we want our system to do. Remember when you wanted more details on what the system would do? Well, now we start to spend some serious energy on getting that done." "Awesome," replied Sally, as she pulled a Red Bull out of her oversized bag and popped it open. "I've got a list here of four core functions the system must perform," said Sanjay, pulling copies of a list from a folder on the table (PE Table 6-1 D). "Let's look at these." After reviewing the list Sanjay had given them, Jim said, “Nice job, Sanjay. But we need to put this in graphical format, so that everyone can see what the inputs and outputs are for each function and how they are related to each other. We also need to see how the new system fits in with our existing data sources. We need..." "Some data-flow diagrams," Sanjay interrupted. "Exactly," said Jim. "They are already done," replied Sanjay, handing diagrams to both Jim and Sally. "I've already created a first draft of the context diagram [PE Figure 6-1 O) and a level-1 diagram [PE Figure 6-2 D). You can see how l've defined the boundaries of our system, and I've included our existing product and marketing databases." "What can I say?" Jim said. “Again, a nice job on your part. These diagrams are both good places for us to start. Let's get copies of all of this to the team." "P'Il be right back," Sally said, standing up. "I need get some coffee."
Transcribed Image Text:CASE: Petrie Electronics PETRIE ELECTRONICS Structuring Systems Requirements: Process Modeling Jim and Sanjay chatted in Jim's office while they waited for Sally to arrive. "Good work on researching those alternatives," Jim said. "Thanks," replied Sanjay. "There are a lot of alternatives out there. I think we found the best three, considering what we are able to pay." Just then Sally walked in. "Sorry I'm late. Things are getting really busy in marketing right now. I've been putting out fires all morning." Sally sat down at the table across from Jim. "I understand," Jim said. "But to stay on schedule, we need to start focusing on the specifics of what we want our system to do. Remember when you wanted more details on what the system would do? Well, now we start to spend some serious energy on getting that done." "Awesome," replied Sally, as she pulled a Red Bull out of her oversized bag and popped it open. "I've got a list here of four core functions the system must perform," said Sanjay, pulling copies of a list from a folder on the table (PE Table 6-1 D). "Let's look at these." After reviewing the list Sanjay had given them, Jim said, “Nice job, Sanjay. But we need to put this in graphical format, so that everyone can see what the inputs and outputs are for each function and how they are related to each other. We also need to see how the new system fits in with our existing data sources. We need..." "Some data-flow diagrams," Sanjay interrupted. "Exactly," said Jim. "They are already done," replied Sanjay, handing diagrams to both Jim and Sally. "I've already created a first draft of the context diagram [PE Figure 6-1 O) and a level-1 diagram [PE Figure 6-2 D). You can see how l've defined the boundaries of our system, and I've included our existing product and marketing databases." "What can I say?" Jim said. “Again, a nice job on your part. These diagrams are both good places for us to start. Let's get copies of all of this to the team." "P'Il be right back," Sally said, standing up. "I need get some coffee."
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Just to remain you, the data flow diagram is a model describing the data streams, or pipes, processes that change or transform data in a system, external entities which are the source or destination of data (and consequently the system limits) and storage or data stores which have access to the system, allowing describe the movement of data through the system.

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