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Separate responsibilities
Clear module boundaries reduce coupling.
Design for observability
Errors, latency and business behaviour must be visible in production.
Record architectural decisions
Documenting context and trade-offs protects long-term ownership.
Turning the principle into an operating decision
Start by defining the business or operational outcome, the people involved, the systems that hold relevant information and the constraints that cannot be ignored. A useful technology decision makes trade-offs explicit, establishes a measurable baseline and assigns ownership for what happens after go-live.
For international and distributed operations, the same decision must also consider language, time zones, privacy, security, integration ownership and support. These factors belong in discovery and architecture—not only in the final deployment checklist.