Act 4, scene 15: Greenfield and brownfield

Scene 15: Greenfield and brownfield

With the approach defined, how is it implemented? That depends on where a product starts. A greenfield product has nothing running yet, so it can build from the bottom, designing its execution layer and data model to be driven by a document. A brownfield product has customers and revenue on its lower layers, and risk grows with depth, so it works from the top down, following the same journey the customer took. Onboarding comes first, then the interface, then the business rules, later or not at all.