Separation of Concerns

Divide a system into distinct sections, each addressing a separate concern. A concern is a set of information that affects the code.

Common Concerns to Separate

• UI/Presentation: How things look
• Business logic/Domain: What things do
• Data access: Where things are stored
• Navigation: How to move between screens
• State management: How data flows
• External services: Third-party integrations

Violation Signs