Chapter 2

The Medications Domain Workflows and Data Structures

Methodology is the product of common sense applied to circumstances.

Samuel E. Morison

In this chapter, we initiate the top-down analysis of the medications domain—“the system”—from two main perspectives: workflows and data structures. The tools we use— dataflow diagram (DFD) and entity-relationship diagram (ERD)—were introduced in Chapter 1.

We identify the external entities interacting with the medications system in the context diagram, and this in turn will help us define the ...

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