2 Principles of architecture

Question 1

What is information hiding?

Answer 1

Implementation decisions should be cointained within a single architectural element.

It should leak as little information as possible about a realization to other elements.

Question 2

What is coupling?

Answer 2

Coupling refers to how much one architectural element depends on another.

Higher coupling increases architectural complexity.

Question 3

What is cohesion?

Answer 3

Cohesion refers to how closely related the subcomponents within an architectural element are.

The cohesion within a module should be stronger than the coupling between different modules.

The goal is not to maximize cohesion but to minimize dependencies, then divide elements to maintain high cohesion.

Question 4

What is separation of concerns?

Answer 4

Each concern should have only one responsibility.

Question 5

What is the open-closed principle?

Answer 5

The modules should be open for extension and close for changes (on what already exists).