23.2. “Analysis” Discoveries During Design: Domain Model
Observe that in the Adapter design in Figure 23.1, the getTaxes operation returns a list of TaxLineItems. That is, on deeper reflection and investigation of how taxes are handled and tax calculators work, the designer (me) realized that a list of tax line items are associated with a sale, such as state tax, federal tax, and so forth (there is always the chance governments will invent new taxes!).
In addition to being a newly created software class in the Design Model, this is a domain concept. It is normal and common to discover noteworthy domain concepts and refined understanding of the requirements during design or programming—iterative development supports this kind of incremental discovery. ...
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