01Method
Most engineering failures between disciplines happen in the seams: firmware blames the app, the app blames the API, the API blames the infrastructure. Systems engineering is the discipline of refusing those seams — one accountable owner across the stack.
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Requirements and constraints
Written down, ranked, and testable before anybody builds. A requirement you cannot verify is a wish.
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Architecture
Partitioning hardware, firmware, software, and infrastructure so each piece can fail, ship, and evolve in the way that is actually cheap.
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Implementation
Firmware, applications, services, and infrastructure built by the same team that drew the boxes, so the drawing stays honest.
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Verification
Every requirement traced to a test that can fail. Field data feeds the next revision rather than the next excuse.