What is the difference between functional and non-functional requirements?

What is the difference between functional and non-functional requirements?

• A. Functional requirements detail what the system should do; non-functional requirements detail how it should perform those functions
• B. Functional requirements are always measurable; non-functional requirements are not
• C. Functional requirements respond to user expectations; non-functional requirements do not
• D. Functional requirements are high-level needs; non-functional requirements are specific features

Answer: (A)

The distinction between functional and non-functional requirements is foundational in systems analysis and design. Functional requirements specify what a system should accomplish; they describe the specific behavior or functions the system must exhibit. This includes actions the system must take in response to particular inputs or under certain conditions, detailing capabilities such as data processing, user interactions, and service functionalities. In contrast, non-functional requirements focus on how the system performs these functions or the quality attributes related to the system's performance. This may encompass aspects like response time, reliability, scalability, security, and usability. Non-functional requirements set the standards and constraints within which the functional requirements must operate, ensuring that while the correct operations are performed, they meet certain criteria for efficiency, performance, and user satisfaction. Understanding this division is crucial for building systems that not only fulfill their intended functions but also align with users' expectations around performance and quality, ultimately ensuring a positive experience and effectively meeting business goals.

The distinction between functional and non-functional requirements is foundational in systems analysis and design. Functional requirements specify what a system should accomplish; they describe the specific behavior or functions the system must exhibit. This includes actions the system must take in response to particular inputs or under certain conditions, detailing capabilities such as data processing, user interactions, and service functionalities.

In contrast, non-functional requirements focus on how the system performs these functions or the quality attributes related to the system's performance. This may encompass aspects like response time, reliability, scalability, security, and usability. Non-functional requirements set the standards and constraints within which the functional requirements must operate, ensuring that while the correct operations are performed, they meet certain criteria for efficiency, performance, and user satisfaction.

Understanding this division is crucial for building systems that not only fulfill their intended functions but also align with users' expectations around performance and quality, ultimately ensuring a positive experience and effectively meeting business goals.