Petrie's Electric Chapter 5

Dimitar Milevski

Professor Mary Yoa

System Analysis And Design - CISM 160

14 Oct. 2015

Hoosier Burger

Chapter 6

a. Modify the Hoosier Burger context-level dataflow diagram Figure 6-4 to reflect the changes mentioned in the case.

b. Modify The Hoosier Burger level-0 diagram Figure 6-5 to reflect the changes mentioned in the case.

c. Prepare level-1 diagrams to reflect the changes mentioned in the case.

Receipt

Receipt

Payment

Payment

Receipt

Receipt

Payment

Payment

5.2

Delivery

5.2

Delivery

5.1

Retrieve Customer Info for Delivery

5.1

Retrieve Customer Info for Delivery

Customer Address

Customer Address

Prepared Food

Prepared Food

Prepared Food

Prepared Food

d. Exchange diagrams with those of another class members. Ask your classmates to review your diagrams for completeness and consistency. What errors did he or she find? Correct these errors.

Petrie’s Electronics

Chapter 6

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

The conservation of inputs and outputs is called balancing. It means that when decomposing a DFD from one level to the next, we must have the same inputs and outputs to processes. In this case Figure 6-1 shows two sources of information going into the system that are generated by the customer, purchase and coupons. Figure 6-2, on the other hand, shows multiple inputs coming from two additional sources, marketing database and product database. The conservation rule is omitted; the two figures are not balanced. The outputs may be the same, but the diagram is not balanced. In order to be balanced to the context diagram, the two additional sources of information illustrated at Figure 6-2 need to be added.

2. Decompose each of the core processes in PE Figure 6-2 and draw a new DFD for each core process.

3. Has the team overlooked any core...