Parts II and III developed Modeling and Alignment separately. This Part runs them together as a method. Modeling supplied a repertoire of representations for making different engineering questions tractable; Alignment supplied the mechanisms through which selected obligations are enforced. In practice, engineers choose and connect these moves as the work demands. MAGE begins by asking what should be made explicit, places enforcement where stable obligations become legible and enforceable, and converts recurring judgment into durable engineering structure.
The MAGE cycle
Model the intent. Enforce stable obligations. Convert recurring judgment into durable engineering structure.
Repeat.
The result is a cycle rather than a catalogue. A task begins from the representations, controls, and evidence the environment already owns. Work exposes what those structures can and cannot answer. Some gaps earn better models; some earn sensors, validators, constraints, or gates; some remain judgment because the underlying obligation is still uncertain. Each useful conversion changes what later work inherits. Useful durable structure becomes engineering capital when later work benefits from it. That capital can drift, depreciate, and cost more to maintain than it returns, so this Part covers operation and retirement as well as accumulation.
DocAble supplies the deep case. Other organizations appear where they sharpen a move. The question here is practical: what should you do next?