Tactics and Principles

Question 1

Explain the Component Cohesion principle Reuse and Release (REP)

Answer 1

• Easier reuse: single components could be used in other contexts
• Easier replacement / release of new versions: single components can be newly released and integrated into the system

Question 2

Explain the Component Cohesion principle Common Closure Principle (CCP)

Answer 2

Gather classes together into one component that change for the same reason at the same time

Question 3

Explain the Component Cohesion principle Common Reuse Principle (CRP)

Answer 3

Don’t force users of a component to depend on things
they don’t need

Need the 3D engine? You get the whole game

Question 4

Explain the Component Coupling Principle The Acyclic Dependencies Principle (ADP)

Answer 4

Do not allow cycles in the component dependency
graph. (THIS MEANS NO LOOPS IN THE “UML”)

Question 5

Explain the Component Coupling Principle The Stable Dependencies Principle (SDP)

Answer 5

Components are hard to change when OTHERS COMPONENT DEPEND ON IT.

Depend in the direction of stability

“The SDP says: less stable components should depend on more stable ones and not vice versa.”

Question 6

Explain the Component Coupling Principle The Stable Abstractions Principle (SAP)

Answer 6

A component should be as abstract as it is stable