Separation of Concern

Presentation, Control, Data. How it should be presented to users, what it should do and how it should be represented.
Business logic and infrastructure. What an application should do from how it does it.
Application construction and its dynamic behaviour. How an application is built, starts, stops and what it does when running.
Production resources and testing resources. Separate code, config, files required for the live system from resources required for testing.
Independenceof application systems.

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