PCPP2 Design Patterns Practice Question
You are applying the Facade pattern to simplify a complex subsystem consisting of three interacting legacy modules. What is the primary architectural requirement for the Facade class to be effective?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Facade should provide a simplified interface that delegates requests to appropriate subsystem objects
The Facade must act as a single entry point, encapsulating the complexity of the internal modules so the client doesn't need to know about them.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Facade must inherit from every class in the subsystem
Why it's wrong here
Inheritance creates tight coupling, which the Facade aims to reduce.
- ✗
The Facade must implement the Singleton pattern to ensure only one interface exists
Why it's wrong here
A Facade does not need to be a Singleton; it is a structural interface.
- ✗
The Facade should expose all methods of the subsystem classes for flexibility
Why it's wrong here
Exposing all methods defeats the purpose of simplifying the interface.
- ✓
The Facade should provide a simplified interface that delegates requests to appropriate subsystem objects
Why this is correct
Delegation is the key mechanism of the Facade pattern to hide complexity.
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Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP2 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP2 exam.