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    <p>The most important things about Domain-Driven Design are the big picture ideas:</p> <ul> <li>the ubiquitous language, </li> <li>the strategic decision-making where you are adding value by working in the core domain (and insulating yourself from other nasty systems), and</li> <li>the approach to making testable, flexible designs by uncoupling infrastructure from business logic. </li> </ul> <p>Those are broadly applicable, and are the most valuable pieces.</p> <p>There is a lot of design-pattern stuff about Factories, Services, Repositories, Aggregates, etc., I take that as advice from one experienced developer to another, not as gospel, because so much of it can vary depending on the language and frameworks that you're using. imho they tend to get overemphasized because programmers like us are detail-oriented and we obsess on that kind of stuff. There is valuable stuff there too, but it needs to be kept in perspective. So some of it may not be that relevant to you, or it might grow on you as you work with it.</p> <p>So I would say it's not like there's a checklist that you can run through to make sure you're using all the patterns, it's a matter of keeping the big picture in mind and seeing how that changes your approach to developing software. And if you pick up some good tips from the patterns that's great too.</p> <p>Specifically with respect to the SOA thing, I've developed applications that defer all their state to the database, which have used persistence-ignorant domain objects. Writing tests for services that have to mock daos and feed stuff back is drudgery, the more logic I can put in the domain objects the less I have to mess with mocks in my services, so I tend to like that approach better.</p>
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    1. USNathan Hughes
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