Four. Isolating the Domain

The part of the software that specifically solves problems from the domain usually constitutes only a small portion of the entire software system, although its importance is disproportionate to its size. To apply our best thinking, we need to be able to look at the elements of our model and see them as a system. We must not be forced to pick them out of a much larger mix of objects, like trying to identify constellations in the night sky. We need to decouple the domain objects from other functions of the system, so we can avoid confusing the domain concepts with other concepts related only to software technology or losing sight of the domain altogether in the mass of the system.

Sophisticated techniques for this isolation ...

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