Act 5, scene 23: Drill-down: the bill

Scene 23: the bill

The journey ends, as it did before, with the bill. The customer's domain document is, in effect, a bill of materials: the capabilities this implementation uses, and how they are put together. The price can follow the customer's document, the way modular physical products are priced: a price for each capability used, plus the work of assembling them for this customer. Packages for common scenarios, priced on their value, sit beside the components. Because the price is computed from the same document the compiler validates, the quote and the implementation cannot drift apart. Assembly becomes a visible, priced service.