The premise of domain-driven design is two-fold:

- For most software projects, the primary focus should be on the domain and domain logic; and
- Complex domain designs should be based on a model.

Domain-driven design not a technology or a methodology. It is a way of thinking and a set of priorities, aimed at accelerating software projects that have to deal with complicated domains.

(excerpted from http://domaindrivendesign.org)

Also see DomainDrivenDesignBook by EricEvans

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