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You are designing a system for an online bookstore. Which of these is a non-functional requirement you should include?

hard📝 Trade-off Q8 of Q15
LLD - Design — Parking Lot System
You are designing a system for an online bookstore. Which of these is a non-functional requirement you should include?
AThe system must handle 5000 concurrent users without slowdown
BThe system must allow users to search books by title
CThe system must provide a payment gateway
DThe system must allow users to write reviews
Step-by-Step Solution
Solution:

  1. Step 1: Identify functional vs non-functional requirements

    Functional requirements describe features like search, payment, and reviews.

  2. Step 2: Recognize performance-related needs

    Handling many users without slowdown is about performance, a non-functional requirement.

  3. Final Answer:

    The system must handle 5000 concurrent users without slowdown -> Option A

  4. Quick Check:

    Performance needs = Non-functional [OK]
Quick Trick: Performance and scalability are non-functional [OK]
Common Mistakes:
MISTAKES
  • Confusing features with performance needs
  • Ignoring concurrency requirements
  • Mixing functional and non-functional

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