book

Vaughn Vernon — Implementing Domain-Driven Design

Vernon, Vaughn. *Implementing Domain-Driven Design*. Upper Saddle River, NJ: Addison-Wesley, 2013.

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.