Code is Cheap, Thinking is Expensive

Purposes of Refactoring

Refactoring has several purposes

• change Architecture
• change, improve, maintainability
• change, improve, testability

Changing the Architecture

• Lift the Architecture out of the code using an SCL
• Refactor the Architecture, not the code

Improving Maintainability

• often, maintainability implies a change to the Architecture (see Changing the Architecture)
• otherwise, refactor the code

Improving Testability

• often, testability implies a change to the Architecture (see Changing the Architecture)
• otherwise, refactor the code