On a contract programme the customer arrives with a design and JE arrives with a floor. Which of the two decides is not constant — it shifts stage by stage, and the failures happen where both sides assumed the other one owned it.
A fabricator who improves your design without telling you has failed the brief.
Where a drawing carries something JE would build differently, the question comes back to you rather than the change going quietly onto the floor. That is what makes the ledger above worth agreeing in advance.
Engagements span custom end-to-end delivery, engineering through delivery, manufacturing and assembly, engineering only, machining only, or assembly only. Each one moves the boundary in the ledger above to a different place.
Each stage produces something specific, and the approved scope decides which of them JE runs on your programme.
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Three programmes at different points on the boundary — build-to-print, fabricate-and-finish, and a fixture built to carry a flight-critical part.
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