CPSA Software Design Principles 2

Question 1

Which design principle states that a class should have only one reason to change?

Accepted Answer

Single Responsibility Principle

Answer

The Single Responsibility Principle (SRP) states that a class should have only one reason to change, meaning it should have only one responsibility.

Question 2

In the context of software coupling, which scenario represents the LOWEST level of coupling?

Accepted Answer

One module passes a single primitive value to another

Answer

Data coupling, where modules interact only through simple parameters, represents the lowest (loosest) form of coupling.

Question 3

Which principle guides you to 'program to an interface, not an implementation'?

Accepted Answer

Dependency Inversion Principle

Answer

The Dependency Inversion Principle advocates programming to abstractions (interfaces) rather than concrete implementations to reduce high-level module dependency on low-level details.

Question 4

A software team notices that changing one module frequently requires changes in many other unrelated modules. This is best described as a violation of which principle?

Accepted Answer

Low Coupling

Answer

When changes ripple across many modules, it indicates high coupling — modules are too tightly interdependent, violating the Low Coupling principle.

Question 5

The Law of Demeter (Principle of Least Knowledge) primarily aims to reduce which quality problem?

Accepted Answer

Tight coupling between objects

Answer

The Law of Demeter limits object interactions to immediate collaborators, reducing tight coupling by preventing deep chains of method calls.

CPSA Exam Practice Test

CPSA Exam Practice Test

CPSA Software Design Principles 2