In 2012 Robert Martin (Uncle Bob) published a blog post titled 'The Clean Architecture', later expanded into a full book. He synthesized Onion Architecture, Hexagonal Architecture, BCE (Entity-Control-Boundary), and DCI into a single, explicitly named model with strict rules about what each layer may import. Clean Architecture is not a new idea — it is a precise formalization of the dependency inversion insight that Palermo and Cockburn had already described. This lesson unpacks the model layer by layer, explains the Dependency Rule, and shows how to implement the boundary objects that separate use cases from delivery mechanisms.
ℹ️The central rule of Clean Architecture is the Dependency Rule: source code dependencies must point only inward, toward higher-level policies. Nothing in an inner circle may know anything about something in an outer circle. This single rule — rigorously enforced — is the entire architecture.
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