Domain-Driven Design: Tackling Complexity in the Heart of Software

An Escalation of Distillations
The various distillation techniques that make up the rest of this chapter can be applied in almost
any order, but there is a range in how radically they modify the design.
A simple 
DOMAIN VISION STATEMENT
communicates the basic concepts and their value with a
minimum investment. The 
HIGHLIGHTED CORE
can improve communication and help guide decision
making—and still requires little or no modification to the design.
More aggressive refactoring and repackaging explicitly separate 
GENERIC SUBDOMAINS
, which can
then be dealt with individually. C
OHESIVE MECHANISMS
can be encapsulated with versatile,
communicative, and supple design. Removing these distractions disentangles the 
CORE
.
Repackaging a 
SEGREGATED CORE
makes the 
CORE
directly visible, even in the code, and facilitates
future work on the 
CORE
model.
And most ambitious is the 
ABSTRACT CORE
, which expresses the most fundamental concepts and
relationships in a pure form (and requires extensive reorganizing and refactoring of the model).
Each of these techniques requires a successively greater commitment, but a knife gets sharper as
its blade is ground finer. Successive distillation of a domain model produces an asset that gives the
project speed, agility, and precision of execution.
To start, we can boil off the least distinctive aspects of the model. G
ENERIC SUBDOMAINS
provide a
contrast to the 
CORE DOMAIN
that clarifies the meaning of each. . . .
[ Team LiB ]

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[ Team LiB ]
Generic Subdomains
Some parts of the model add complexity without capturing or communicating
specialized knowledge. Anything extraneous makes the