We make sure to express those rules in the business jargon (the ubiquitous language in DDD terminology). We choose memorable identifiers for our objects so that the examples are easier to talk about.
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So it is in the mundane world of business. The terminology used by business stakeholders represents a distilled understanding of the domain model, where complex ideas and processes are boiled down to a single word or phrase.
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The domain is a fancy way of saying the problem you’re trying to solve.
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After all, our customers don’t care about the data model. They care about what the system does; otherwise they’d just use a spreadsheet.
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behavior should come first and drive our storage requirements
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Most developers have never seen a domain model, only a data model.
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All problems in computer science can be solved by adding another level of indirection.