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  • nahla Al-gethami thinks this is interesting:

Now look again at Figure 4-1 and notice that these same data bundles are listed as Major Inputs in the use case, with the source listed as the Customer. Also, there are two arrows coming in to the Customer external entity from the rounded rectangles, representing bundles of data that the processes produce to flow back to the customer. These data bundles are listed under Major Outputs in the use case (Figure 4-1), with the destination listed as the Customer.


Cover of Systems Analysis and Design, 4th Edition