Why additional principles improve quality in LLD - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

How do additional design principles affect system maintainability?

Consider a software system designed with only basic principles versus one designed with additional principles like modularity and separation of concerns. What is the main benefit of adding these extra principles?

A It improves maintainability by making components easier to isolate and update.

B It reduces system performance due to added complexity.

C It makes the system harder to understand because of more rules.

D It increases the initial development time without any long-term benefits.

💡 Hint

Think about how breaking a big task into smaller parts helps you fix or change things faster.

Additional principles like modularity and separation of concerns help isolate parts of the system. This isolation makes it easier to update or fix one part without affecting others, improving maintainability.

❓ Architecture

intermediate

Which principle best supports scalability in system design?

Among the following principles, which one most directly helps a system handle increased load by allowing it to grow smoothly?

A High Cohesion

B Don't Repeat Yourself (DRY)

C Single Responsibility Principle

D Loose Coupling

💡 Hint

Think about how parts that depend less on each other can be changed or scaled independently.

Loose coupling means components depend less on each other, so you can scale or change one part without affecting others, which supports scalability.

❓ tradeoff

advanced

What is a common tradeoff when applying many design principles simultaneously?

Applying multiple design principles often improves quality but can introduce tradeoffs. Which of the following is a typical tradeoff?

A Improved system quality with no impact on development speed.

B Reduced system flexibility due to rigid design rules.

C Increased complexity that may slow down initial development but improves long-term quality.

D Lower code readability because of too many design patterns.

💡 Hint

Consider how adding rules can slow you down at first but help later.

Applying many principles can increase initial complexity and development time, but this investment usually leads to better long-term quality and easier maintenance.

❓ scaling

advanced

How do additional principles like fault tolerance improve system reliability at scale?

When a system grows larger, why does adding principles such as fault tolerance improve its reliability?

A They reduce the number of components, making failures less likely.

B They allow the system to continue working correctly even if some parts fail.

C They increase system speed by avoiding error checks.

D They simplify the system by removing redundant components.

💡 Hint

Think about how having backups helps keep things running when something breaks.

Fault tolerance means the system can handle failures in some parts without stopping the whole system, which is crucial as systems scale.

❓ estimation

expert

Estimate the impact of adding multiple design principles on system development time and quality.

A team plans to add five additional design principles to their project. If the initial development time is 6 months and quality is rated at 70%, estimate the expected development time and quality after applying these principles, assuming a 25% increase in development time and a 15% increase in quality.

A Development time: 7.5 months, Quality: 85%

B Development time: 7.5 months, Quality: 70%

C Development time: 6 months, Quality: 85%

D Development time: 6 months, Quality: 70%

💡 Hint

Calculate 25% more than 6 months and add 15% to 70% quality.

25% increase on 6 months is 1.5 months extra, totaling 7.5 months. 15% increase in quality from 70% totals 85% quality.