book

Eric Evans — Domain-Driven Design: Tackling Complexity in the Heart of Software

Evans, Eric. *Domain-Driven Design: Tackling Complexity in the Heart of Software*. Boston: Addison-Wesley, 2003.

Focus in observatory

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Coupling

Cohesion, Consequence, and the Architecture of Responsibility

A practical framework for seeing where systems are tightly joined, where they drift apart, and how those coupling choices shape accountability over time.