CPSA Designing Building Blocks 2

Question 1

Which principle states that a building block should have only one reason to change?

Accepted Answer

Single Responsibility Principle

Answer

The Single Responsibility Principle (SRP) dictates that each building block should encapsulate exactly one reason for change.

Question 2

What is the primary purpose of defining explicit interfaces between building blocks?

Accepted Answer

To enforce encapsulation and reduce coupling

Answer

Explicit interfaces enforce encapsulation by hiding internal details and reduce coupling between building blocks.

Question 3

In iSAQB terminology, a 'building block' is best described as:

Accepted Answer

A named, self-contained architectural element with defined responsibilities

Answer

A building block is a named, self-contained architectural element with clearly defined responsibilities and interfaces.

Question 4

When should a software architect choose to split one building block into two separate blocks?

Accepted Answer

When the block has multiple distinct responsibilities that change for different reasons

Answer

Splitting is justified when distinct responsibilities evolve independently, aligning with SRP to reduce change impact.

Question 5

Which coupling type is considered MOST harmful to building block design?

Accepted Answer

Content coupling

Answer

Content coupling, where one block directly accesses or modifies the internals of another, is the strongest and most harmful form of coupling.

CPSA Exam Practice Test