Ask Michelle and Aidan to review the order system context diagram on page 150, and compare it with the order system diagram 0 DFD on page 153. Then ask them to answer the following questions: (a) How many external entities are shown in each diagram? (b) In each diagram, how many data flows connect to the external entities? (c) How many processes are identified in the diagram 0 DFD? (d) Could the data store have been shown in the context diagram? Why or why not?
What will be an ideal response?What will be an ideal response?
(a) There are five entities in each diagram.
(b) Nine data flows connect to the external entities in each diagram.
(c) Three sub-processes are identified in diagram 0 DFD.
(d) The data store could not have been shown in the context diagram because a data store cannot connect to an external entity. The data store can connect to one or more processes, and it is shown in the diagram 0 DFD.
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