QUESTION 24 OF 25

What are some of the differences between functional and non-functional requirements?

This technical question is asking you to compare two similar but different terms. When comparing to technical items, you should first define them, discuss their differences, and then provide examples of how they are used. This will ensure that you're answering the question completely and addressing the interviewer's inquiry. As always, be prepared for follow-up questions.

"The functional requirements of a system describe what the system should do. The non-functional requirements address how the system performs or operates. For example, functional requirements can include authentication, transactions, administrative functions, and other system processes. Non-functional requirements may include security, performance levels, scalability of the system, and capacity. Both elements are needed to properly design and provision a computer system."

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Anonymous Answer

Functional requirements address the basics needed for a given product or solution to deliver its deliverable. While non-functional requirements address the: usability, reliability, performance, and supportability of the product or solution. An example of a functional requirement is for a car to start and move while a non-functional is for the car to have seat belts or red brake lights.

Amanda's Feedback

You're right - functional requirements address what a system does or must not do, while non-functional requirements address how the system does something. Ultimately, non-functional requirements don't affect the primary functionality of a system.

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Computer Systems Analyst Mock Interview

What are some of the differences between functional and non-functional requirements?

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