SDLC becomes SELC: one seat reassigned, the lifecycle otherwise intact. The fleet writes the code; the engineer keeps the seats that were always the engineering.

ConceptBig idea 6 · the seat

The lifecycle stays, but now agents sit in the developer's seat

SDLC to SELC: one seat reassigned Two lanes of the same six lifecycle activities — requirements, specification, design, implementation, validation, maintenance. Top lane, the conventional SDLC, has every seat held by one engineering role, with implementation marked as the seat that consumes the calendar. Bottom lane, the SELC, reassigns the implementation seat to the agent fleet, drawn in the accent colour; the engineer flanks the fleet, authoring intent on the left and judging and governing the output on the right, and a governance band beneath holds every seat’s output. A dashed arc returns from the last activity to the first, the cycle in “life cycle.” SDLC — CONVENTIONAL Requirements Specification Design Implementation eats the calendar Validation Maintenance the engineering role — every seat, and above all the developer’s one seat reassigned: the D is delegated to the fleet SELC — MAGE Requirements Specification authored as models Design authored as models Implementation the agents Validation gates, not reading Maintenance run as governance the engineer — authors the intent the fleet — develops the engineer — judges and governs governance — the environment holds every seat’s output to the standard the engineer set (Part Two) the keystrokes are delegated; the accountability is not

Engineering intuition

The engineer flanks the fleet: models carry intent in on one side, judgment meets the output on the other. The seats the human keeps — requirements, specification, design, validation — were always the consequential ones; now they are the job.

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