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brownfield architecture
/ˈbraʊn.fiːld ˈɑːr.kɪ.tɛk.tʃər/ - n.
1 [colloq.] Where the architecture meets the people who depend on it and loses.Keep. Punchy.This is the problem.
Working definition
2. A design that must integrate with and evolve existing legacy systems, accommodating their constraints, data, and dependencies.