Cover page by Eric Evans

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Eleven. Applying Analysis Patterns

Deep models and supple designs don’t come easily. Progress comes from lots of learning about the domain, lots of talking, and lots of trial and error. Sometimes, though, we can get a leg up.

When an experienced developer looking at a domain problem sees a familiar sort of responsibility or a familiar web of relationships, he or she can draw on the memory of how the problem was solved before. What models were tried and which worked? What difficulties arose in implementation and how were they resolved? The trial and error of that earlier experience is suddenly relevant to the new situation. Some of these patterns have been documented and shared, allowing the rest of us to draw on the accumulated experience.

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