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via The Clean Architecture | 8th Light by “Uncle” Bob Martin The outer circles are mechanisms. The inner circles are policies. The overriding rule that makes this architecture work is The Dependency Rule . This rule says that source code dependencies can only point inwards . Entities Use Cases Adapters (Controllers, Gateways, Presenters) Frameworks Only Four Circles? No, the circles are schematic. You may find that you need more than just these four. There’s no rule that says you must always have just these four. ...